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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Korean Society of Civil Engeneers
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Volume & Issues
Volume 19, Issue 3_6 - Nov 1999
Volume 19, Issue 2_6 - Nov 1999
Volume 19, Issue 1_6 - Nov 1999
Volume 19, Issue 3_5 - Sep 1999
Volume 19, Issue 2_5 - Sep 1999
Volume 19, Issue 1_5 - Sep 1999
Volume 19, Issue 3_4 - Jul 1999
Volume 19, Issue 2_4 - Jul 1999
Volume 19, Issue 1_4 - Jul 1999
Volume 19, Issue 3_3 - May 1999
Volume 19, Issue 2_3 - May 1999
Volume 19, Issue 1_3 - May 1999
Volume 19, Issue 3_2 - Mar 1999
Volume 19, Issue 2_2 - Mar 1999
Volume 19, Issue 1_2 - Mar 1999
Volume 19, Issue 3_1 - Jan 1999
Volume 19, Issue 2_1 - Jan 1999
Volume 19, Issue 1_1 - Jan 1999
Selecting the target year
A Comparison of Efficiency on P-Turn Operations Using Traffic Island at Signalized Intersection
Kim, Jung-Lae ; Kim, Ki-Hyuk ; Kim, Teak-Keun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 529~529
The purpose of this research is to improve four way intersection congestion problems using the method of P-turn operation at large intersection on urban major arterial road. This research, therefore, compare with and evaluate about conventional 4 phases signal system, permitted P-Turn system, and protected P-Turn system according to intersection travel methods and signal operations. Also, this research recommend that the range of application of P-Turn operation through sensitivity analysis as to each traffic scenarios about traffic queue length at intersection. As a result of this research, some parameters affected on this research are depending on left turn volumes, signal conditions, and geometric of island, finally, taking a view of all cases, permitted P-Turn and protected P-Turn operations are analyzed better than conventional 4 phases system operation.
A study on the Hump of Installation Standard by the Vertical Acceleration test
Kum, Ki-Jung ; Noh, Kwan-Sub ; Kim, Yong-Suk ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 541~541
The installation standard of Hump is quoted a standard of England's TRRL (Transport and Road Research Laboratory) without the inspection so the design consider of road's use-realities and a condition of perimeter road and warrants insufficient so a lot of problems are pointed out in low-speed that the pleasance of running does not definite. So in this study, the size suitable to our situation that focused on the uplift so we construct test-method of Hump and according to Hump's width and height through vertical shift (G) test examine proper warrants and hereafter institution-size and management, operation plan.
A Study on the Structure of Transportation Planning Factor by ISM (Interpretive Structure Modeling)
Lee, Hoo-Moo ; Kum, Ki-Jung ; Kim, Myung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 553~553
An Analysis social system was used for number of methods for technically solving the problems according to the purpose but according to change of social change factor or individual's view of value, the interest and the demand for these factors are getting higher, lately. And it is able to approach more efficient and system through being structure between each related items. So, this research will reconsider the efficiency with examples of the area of school zone traffic safety and being structure of problems according to using of new transportation modal in order to improve the efficiency of the plan through being structure ISM (Interpretive Structure Modeling) between items for solving the problems related transportation area that is expected to improve.
An Analytical Methodology to Estimate Link Travel Times between Traffic Actuated Operating Intersections Using Stop Line Detector Output
Son, Young-Tae ; Oh, Jae-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 561~561
Loop detectors are valuable source of informations and produce continuous data on traffic characteristics of a specific point. Furthermore, loop detectors are already installed in many major intersections for the purpose of traffic signal control. Thus, it is desirable to find a way to use detector output to provide traffic information to users. A methodology to estimate link travel times on an arterial road using output from stop line loop detectors was developed. The methodology is an analytical approach to link travel time estimation considering traffic behavior at intersections and affect of signal coordination and signal timing. Link travel time estimated by the proposed methodology is by cycle and the methodology are to be used for intersections operated with traffic responsive control system.
A Study on the Before & After Evaluation of Residential Permit Parking Program (RPPP)
Kim, Ho-Young ; Kum, Ki-Jung ; Kim, Myung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 571~571
One of the traffic problems in large cities is the issue of parking on residential district roads. The problem is worsening by the day, not merely affecting parking but also reducing road space and passage capacity, while obstructing the access of emergency vehicles, in sum, causing the loss of essential road safety functions. An attempt to improve the residential parking situation was the Residents Priority Parking System taken in Seoul, 1996, but there were various problems to this policy due to equal access to parking areas, overall lack of parking space, and lack of understanding by the areas residents. The purpose of this research is to analyze the effect of the Residents Priority Parking System and investigate possibilities for future improvement. The research will compare the situations before and after the policy was implemented by investigating a given area and taking an opinion survey of the areas residents.
A Study on the Relevance Laws and the Characteristics of Vertical Moving of Old Aged Persons in Subway Station
Kum, Ki-Jung ; Seo, Jae-Mo ; Kwon, Young-In ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 579~579
Our society is paying more attention to the senior society in which average life span increases thanks to higher income level. Improved social environment such as clothes, food, and housing and developed medical technology. It is expected that the nation and the seoul city might advance into the senior society in the year of 2001 and 2011 each. The old-aged population who usually take the subway in seoul have increased more than 20% each year but the service facilities at the station didn't meet their demands. By the way, the senior people have more sluggish movement at stairs because of the retarded physical function with the strong rejection against the stairs and the increasing demand for the convenient facilities. Therefore, this study worked on the traits of vertical movement among the old people and found for what and how much they feel uncomfortable in their passing through comparison with the non-senior people in sample area. By reviewing the installation standards based on the subway stairs regulations and making better proposals for the future, the study has a purpose of making senior people more comfortable, expanding more chances for them to participate in social activities, and preparing for the senior society.
Design Guideline for the Length of Turning Lanes at Flared Intersections
Kim, Dong-Nyeong ; Lee, Seung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 591~591
The purpose of this study is to make guidelines for the length of turning lanes at flared intersections. NETSIM model was used to simulate the intersection with various number of approach lanes. Repetitive simulation was carried out for different traffic conditions of cycle length, g/C ratio and demand. Field experiments were done at five sites to certify the model. It was proved that this model was useful to analyse the length of turning lane. The results shows that the value from 130m to 140m is most suitable to maximize the capacity for the cycle length of 120 seconds and the g/C ratio of 0.3. Design chart for different cases was suggested also which can be used to design intersection geometries.
Development of the Mode Choice Models in Tourism Region Considering Latent Variables
Kim, Myung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 603~603
The recent trend in the transportation system only attempts to approach in the various individual type for the precise analysis and to cover up the demerit of the aggregate type. Yet, besides the quantitative factors such as travel hour and travel expense, the qualitative one like the attractiveness of the tourism region and the latent variable of images must be regarded as significant factors. Focused on this matter, this research establishes the measurement which considers the latent variable of the qualitative factors (comfort, pleasantness, convenience, image), and with this standard, my study focuses on building up a development of the mode choice models and the transportation characteristics in tourism region. In the result of the problem application to mode choice behavior in tourism, it is found out that the two qualitative factors such as the convenience of transportation construction and the convenience of transportation system make an important influence on choosing the transportation system. The results of this research help us to estimate the effective transportation demand in the future plan, leads into its efficient renovation of the traffic system, and creates people's attraction for a tourism region.
Dynamic Modeling of Route Choice Behavior with Travel Time Information on Pre-Trip
NamGung, Moon ; Lee, Byung-Joo ; Kim, Won-Chul ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 615~615
Drivers under uncertanity information are facing to trobule behavior. This study are conducted to drivers' route choice behavior model with pre-trips travel time information on three alternative route in Kwang Ju city. An analysis and test are carrying out based on the survey data. The stated preference survey are used in this study. The travel time information is provided during each time periodes which take peak hour in the morning. A dynamic travel behavior introduced the time seriese factors are developed. The value of rho-square
on the model is 0.319, which means reasonable for travel behavioral modeling.
Construction of Binder Viscosity Data Base for Asphalt Pavement
Huh, Jung-Do ; Nam, Young-Kug ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 629~629
So far, viscosity of binders reported in literature has been measured at one fixed point of shear rates only for a single purpose of binder grading (i.e., viscosity grading, performance grading, etc.). However, except the grad- ing, other roles of viscosity measurement, i.e., in quantitatively identifying characteristics of binders as well as in obtaining parameters of a binder constitutive equation, are also important. These purposes require to measure viscosity over the whole range of shear rates, not a single point. This investigation introduces a promising viscosity constitutive equation in the field of an asphalt binder, and attempts to predict binder viscosity data by the equation over all ranges of shear rates to check its effectiveness. As the result, the equation is turned out to be successful in expressing rheological behaviors of binders. In addition, the parameters evaluated are found to have a direct relationship with chemical, physical, and deformational characteristics of binders. And different parameter values shown in various binders are identified to represent quantitatively corresponding property variation. Finally, first time in this study, the importance of constructing viscosity database which is collection of a parameter set for all binders is stressed.
The Development of Urban Information System for Application of Urban Planning Work
Choi, Seok-Geun ; Jung, Sung-Hyuk ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 637~637
Due to fast changes of urban structure, graphic and attribute information for urban planning is presently increased. Therefore, the purposes of this study are to produce database and to query and process quickly for a large amount of information in terms of GSIS (Geo-Spatial Information System). This study offers the determination and alternation of urban planning road, computerized urban authorization, automatic calculation for road compensation and management of underground facilities in the urban planning works. This study also provides the trust and the fast service improved to civilian about the administration work, the economic effect due to avoiding duplicate investment, and improvement of urban planning work.
The Development of Solution Program for the Efficient Digital Mapping
Lee, Jae-Kee ; Choi, Seok-Keun ; Park, Kyung-Yul ; Park, Kyeong-Sik ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 649~649
There are a lot of problems of accuracy and efficiency because most of the steps of production of digital mapping are accomplished by manual work using commercial softwares. Especially, the step of automatic processing is considered to save time and to obtain efficiency of economy because manual input with digitizer and joining to be on the border would occur a lot of errors. Therefore, the purpose of this study is the development of program for automatic processing which is to insert elevations and to join elements. It is necessary to keep the accuracy and the improvement of efficiency of digital mapping. This automatic program for digital mapping could acquire the improvement of efficiency 23% and save of cost 13.8% respectively compared with efficiency and cost of the mapping agency.
A Study on the Diverse and Common Application of Digital Data of Cadastral Maps Using Integrated Land Information Systems
Yeu, Bock-Mo ; Lee, Suk-Kun ; Kim, Gab-Jin ; Kim, Eui-Myoung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 659~659
Recently, there has been much demands for the digital information of cadastral maps in other systems. Land Information System is the answer to meet with the demands of the public for effective cadastral administration and higher quality of service. The use of common Data Base Management System and development of data exchange method are the key for effective application of cadastral information. It was configurated in order to implement useful data exchange and common service of cadastral maps in the relationship with other information systems that total network system of data server and application program client method. In this study, The graphic and attribute data of cadatral maps were integrated on the same DBMS and the diverse and common applications of cadastral maps were shown in Urban Information System and Facility Management System, etc.
The Development of Deformation System for Structure Using Laser Beam
Kim, Gam-Lae ; Kim, Myoung-Bae ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 669~669
In order to impose an effective check on the existing method of measurement, this study make an attempt to attach a sensor on a structure, which can perceive a laser beam sent out from a light source at any place. This system makes it possible to measure an absolute amount of displacement according to accurately survey an amount of fluctuation in process of time. As a part of identification, a measuring experiment was put into operation to make PC beam and survey an displacement amount of it after a compress test, and the same method was applied to a bending test of railroad track. The result of experiment to compare the products by means of each method and each structure was satisfactory. Accordingly these facts attest to the possibility of accurate measurement owing to gauge an absolute displacement amount of structure.
The Accuracy Improvement of Digital Image for the TransformationMeasurement of Construction
Shin, Bong-Ho ; Eum, Jae-Gu ; Yang, Sung-Yong ; Song, Wang-Jae ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 677~677
In this study, intending to present the behavior measurement of structural frame, I constructed the DCRP system and carried the 3-D position analyses of structural frame. I acquisited real-time images on the bridge model using by steel video camera, video camera, and scanning images and performed error analyses according to image aquisition methods and analysis algorithms. And I constructed the image coordinate system of scanning images and analyzed symmetric changes of circle targets on the tilted images for improving the measurement accuracy. In the results of carrying the error analyses using by measurement algorithms, I could know the fact that changes of Threshold values, computed by image segmentation methods, more affect the analysis accuracy of images, and after applied to the image segmentation of T-3 and ellipse fitting(I) method, I could obtain more improved accuracy. As I applied it to the Kodak DCS 200 images and
scanning images, I could obtain about 1/280 pixel accuracy and the average standard deviation of 0.1876 mm, 0.2222 mm, and 0.8642 mm in the x, y, z coordinate system.
Development of Change Detection Technique of Land Cover using Results of Fuzzy Supervised Classification of Remotely Sensed Multi-temporal Images
Yang, In-Tae ; Kim, Heung-Kyoo ; Shin, Kye-Jong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 687~687
A time-series of inventories and the detection of change frequently used to extract of information related to human activity and natural cycle, because a one-time inventory of natural resources and appearances is limited value. Also, Change information is becoming increasingly important in local and global environmental monitoring. In this meaning, this research performed to development of new technique, more precise and easy implementation of database not general techniques for classification and change detection. Therefore, this research will perform on the fuzzy supervised classification at same training site using multi-temporal. satellite images. And then, performed to new change detection technique on every class. Results of this study explored effectively usable fuzzy classification result for development of change detection algorithm, and explores ways toward possibility that elevate change detection accuracy for improving some problems from traditional change detection ways.
A Study on Application of GSIS for Land Price Auto-Computation
Jung, Young-Dong ; Cho, Gi-Sung ; Park, Sung-Kyu ; Lim, Seoung-Hyeon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 695~695
This study deals with the auto-extraction of land price and land characteristics using GSIS. We developed algorithms and auto-evaluation programs that can carry out automatically entire process on public price auto-evaluation service being carried present. And, we tried to find efficient methods on auto-price evaluation. It presented the method that can auto-extract efficiently general land characteristic items such as shape, height, aspect and road contact condition which was not dealt in previous study using GSIS. This study shows that spatial analysis method with vector type can be used efficiently to evaluate geometric relation between processing object and a adjacent object and to compare attribute data mutually. In this study we make a programs which much approach to the select in process of comparison standard parcel. And use this program, we can accurately, consistently automate the selection of comparison standard parcel. As a consequence of it, we can increase the reliance of estimation results. By using these results at price estimation for the constitution of housing land on land price estimation service and a housing land development, we can expect that it is more efficient and scientific than a previous method in aspect of rapidity and objectivity.
Accuracy Assessment of Digital Orthophoto
Kim, Kam-Lae ; Chun, Ho-Woun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 709~709
This study presents the relationships between the orientation accuracy with scanning resolution and the digital elevation model(DEM) accuracy on image matching to evaluate the digital orthophoto using a large scale aerial photographs. According to the experimental results, the high resolution of scanning has not been directly affected to the orientation accuracy. The standard deviation and the bias error of DEM was increased when we adopted large grid space and small scale of photographs. It represented that the precise DEM must be used in orthophoto generation tosatisfy the 1/1,000 digital map accuracy when we used 1/5,000 scale of photographs. The closed area in orthophoto was reduced when we used two different scale of aerial photo.
Real-Time Correction of GPS Observables to Efficiently Construct GIS D/B
Kang, Joon-Mook ; Choi, Jong-Hyun ; Song, Seung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 719~719
Accuracy of GPS positioning has been widely distributed with the technique of GPS positioning. Various techniques of GPS positioning have been developing with working characteristic and requirement accuracy. Specially, real-time GPS positioning that is performed with the real-time corrections for code pseudorange or carrier phase is widely used in many applications. In this study, The RF communication system was used to correct GPS observables with transmitting and receiving correction data of RTCM SC-104 format. In case of the real- time correction for carrier phase, OTF(On-The-Fly) technique was used to resolve integer ambiguity for carrier phase. By these, I estimated the accuracy of GPS positioning according to real-time correction of code pseudorange or carrier phase and analysis the cause of error. Also, I suggested effective of real-time GPS positioning with pen computer system expressing real-time positioning on digital map.
Analysis of Error Components for High Precise GPS Processing
Park, Un-Yong ; Choi, Jong-Hyun ; Bae, Sang-Ho ; Kang, Joon-Mook ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 729~729
Recently, the utility of GPS in the field of precise geodesy such as construction of national geodetic network is increasing and various application studies are being carried out in perception of diastrophism and geophysics. As these fields require high accuracy in lang baseline, detailed analysis of GPS error components is essential. In this study, we performed error analysis far the maintenance of middle long baseline, and presented suitability of processing by quality control and data cleaning. Also, we presented data far the maintenance of high accuracy GPS survey by analysis the precision of linear combination of dual frequency observables.
Experimental Study on the Earth Pressure Around Arch-Shaped Cut-and-Cover Tunnel and the Deformation Behavior of Tunnel Lining
Yoo, Kun-Sun ; Lee, Sang-Duk ; Lee, Chung-In ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 737~737
Large scaled model tests were carried out in order to study the short-term deformation behavior of the cut-and-cover tunnel which was constructed by the vertical cut and cover method without compaction. The model tests were simulated with an arch-shaped tunnel lining which was made of steel plate, being reduced to the 1/8 of actual tunnel size. In these tests, earth pressures acting on the tunnel lining and displacements of the lining itself were measured with the backfill being progressed. As a result of the test, it was founded that a narrower backfill-space produced a smaller earth pressure to the tunnel wall and then resulted in increase of tunnel lining deformation.
Buckling Load of Tapered Pile Embedded Partially in Soil
Lee, Byoung-Koo ; Jeong, Jin-Seob ; Oh, Sang-Jin ; Li, Guang Fan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 745~745
A numerical method for calculating the buckling load of tapered pile embedded partially in the elastic foundation is developed. The ordinary differential equation governing the buckled shape of pile is derived due to the dynamic concept of the free vibration of such pile, in which three types of linear tapered piles i.e. width, depth, and square tapers are considered. This equation subjected to the end constraints of piles is solved numerically. The Runge-Kutta method is used for integrating the differential equation, and the determinant search method combined with the Regula-Falsi method is used for determining the eigenvalues (buckling loads). In numerical examples, the two lowest buckling loads are presented as functions of three non-dimensional system parameters: the embedded length parameter, the foundation parameter, and the section ratio. The effect of taper types on buckling loads is reported. In addition, the typical mode shapes of buckled piles are presented.
A Study on the Stability Analysis of the Sloping Revetment by Soil Reinforcement
Ahn, Jong-Pil ; Park, Ju-Won ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 753~753
By means of the poor subsoil improvement method of the sloping revetment, this study carried out stability analysis and assessment by the fuzzy-bayesian approach, using Forced Displacement Method (F.D.M) and Chemical pile Grouting Method(C.G.M), applied for each other 4 are as that were different from the conditions of subsoil and nature. As a result, C.G.M is appeared excellently then F.D.M in the stability by the condition of topographic features of the poor subsoil improvement method. And according to the fuzzy-bayesian approach, C.G.M is appeared excellently then F.D.M in the stability assessment.
The Study on Electrical and Chemical Variation in Electro Kinetics Drainage System
Kim, Soo-Sam ; Han, Sang-Jae ; Jeung, Seung-Yong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 767~767
In this paper, the corrosion of electrode, pH change, the variation of voltage and electric current in clayey soils due to the application of the electro osmosis method were investigated through laboratory bench scale tests. Kaolinite was selected as test soil and the tests were performed with the varying electrolyte (NaCl) concentration i.e. 0, 0.01, 0.1, 1 Mole. The contact line of the acid front in the positive pole with the base front in the negative pole was moved to the positive pole due to the increase of concentration. The curved voltage drop was initially observed around the positive pole, however, at the end of the test process the voltage descends suddenly around the negative pole due to the resistant change of a sample. With gradual increase of voltage distribution and sudden increase of the electric current at each location with the increase of concentration. Due to the increase of electric power consumption with the increasing salt concentration the electro osmosis may have a better efficiency at the site of low salinity.
Comprarison of Yasufuku's and Lade's Single Hardening Constitutive Models for Compacted Decomposed Granite Soil
Jeong, Jin-Seob ; Kang, Byung-Sun ; Shin, Hyun-Soon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 775~775
Two constitutive models, Yasufuku's and Lade's constitutive models with a single yield surface are compared in terms of their capabilities to accurately capture the observed behavior of Iksan compacted decomposed granite soil for various stress-paths. The strains calculated from models are reasonable agreement with those measured, but some discrepancies occur. The largest differences between measured and from Lade model calculated strains occur for proportional loading with increasing stresses. Yasufuku's single hardening model may model the observed Iksan compacted decomposed granite Soil behavior with better accuracy for proportional loading with increasing stress and for p-constant loading with increasing stress ratio.
Dynamic Behavior of Decomposed Granite Soils with Various Fine Contents
Lee, Chong-Kyu ; Kim, Duk-Yong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 785~785
The purpose of this paper is to analize the dynamic behavior of unsaturated granite soils under low and intermediate strain amplitude. Samples were taken from the region of Suwon. Both resonant column and cyclic triaxial test were carried out to investigate the dynamic behavior of decomposed grainte soils due to a fine contents, degree of saturation, confining pressure and number of loading cycles. Test results and data have shown that maximum shear modulus and maximum dynamic Young's modulus at optimum moisture content represented samples with 20% fine contents. And also suggests that the higher the content of the fine particles in samples, the greater optimum degree of saturation. In the case of resonant column tests, independent of confining pressure and degree of saturation, dynamic Young's modulus decreases increasing the number of loading cycles.
Lateral Earth Pressures on Model Walls during Backfill: I. Fixed Wall
Chung, Sung-Gyo ; Kim, Moon-Gyu ; Chung, Jin-Gyo ; Lee, Man-Yeol ; Nam, Sun-Woo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 795~795
A series of laboratory experiments were carried out to observe the variation of lateral earth pressure acting on the fixed wall with variations of the geometries of retaining wall and backfill. For the experiments, a soil-box, model wall, and a rainer were designed and manufactured. Some load cells were manufactured to measure normal and shear stresses. To control the wall friction angle, sand papers of various types were attached to the faces of the retaining wall and slope wall. During the backfill, the developed lateral earth pressure, displacements and the change of wall friction were measured and analysed. The measured lateral earth pressures were compared with those evaluated by theories. As the result of comparison, the value of the coefficient of lateral earth pressure decreased to the level slightly less than
value as the backfill proceeded. With the narrower backfill width, the measured lateral earth pressure approached to that from the extended silo theory. Under different conditions, the measured values did not agree well with the theoretical values.
Lateral Earth Pressures on Model Walls During Backfill : II. Movable Wall
Chung, Sung-Gyo ; Kim, Moon-Gyu ; Chung, Jin-Gyo ; Lee, Man-Yeol ; Nam, Sun-Woo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 807~807
A series of laboratory experiments were carried out to observe the variation of lateral earth pressure acting on the movable wall with variations of geometries of wall and backfill. During and after the backfill, the developed lateral earth pressure, displacements, and the change of wall friction angle were measured. And the measured lateral earth pressures were compared with those by extended silo and wedge theories. As the backfill height increased, the lateral movement and settlement of the wall grew larger and the lateral earth pressure gradually reduced to the coulomb's active earth pressure in the final from
value in the begining. It was shown that the measured lateral earth pressure was highly influenced by the backfill width, the angles of the wall slope, and the fixed face.
A Study on Estimate of Proper Strain Rate for CRS Test
Lee, Song ; Lee, Kyu-Hwan ; Chae, Jum-Sik ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 821~821
To investigate estimate method of proper strain rate for CRS test, this study was performed with strain rate that determined by various estimate methods. Also, the CRS tests were performed with different strain rate to understand the effect of strain rate on the consolidation characteristics. With the that test, in case of selecting strain rate for soils with low liquid limit, it was found that ASTM criterion is reasonable, and for soils with high liquid limit, it was found that average value estimated by both ASTM criterion and Armour & Drnevich's empirical equation is reasonable. Also, it was found that the consolidation characteristics are influenced by strain rate, i.e, the preconsolidation pressure was increased in proportion to strain rates and the compression index was infinitesimally decreased with increasing strain rates. Also, the coefficient of consolidation and permeability estimated from CRS test has a tendency to converge to a certain value regardless of strain rate at a normally consolidation range. However, Those coefficients have a irregular value at the recompression range.
Optimal Pile Placement for Minimizing Differential Settlements in Piled Raft Foundations
Kim, Kyung-Nam ; Lee, Su-Hyung ; Chung, Choong-Ki ; Lee, Hae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 831~831
This paper presents an optimal pile placement scheme to minimize the differential settlements of piled raft systems. A raft is modelled as a plate based on the Mindlin theory, and soils and piles are modelled as the Winkler springs and single springs, respectively. Interactions between piles are neglected. The pile spring constant is obtained by the method proposed by Randolph and Wroth, and the
frmula is adopted to obtain the Winkler spring constant. The raft is discretized by isoparameteric finite element. The object function for the optimization is derived from the area of the deflected surface of a raft, and the locations of piles are selected as design variables. Inequality constraints are imposed to keep all piles completely inside of the raft. The recursive quadratic programming is adopted to minimize the nonlinear object function with respect to the design variables. The direct differentiation method is used to obtain the sensitivity of displacement. The validity and effectiveness of the proposed method are demonstrated by three numerical examples.
Behaviour of Undisturbed and Compaction Weathered Granite Soil on Elasto-Plastic Constitutive Model
Kim, Chan-Kee ; Lee, Kang-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_4, 1999, Pages 841~841
This paper is presented of the stress-strain, volumetric strain characteristics of the Pocheon weathered granite soil with variation of the initial water content under drained conditions. A series of consolidated drained triaxial compression tests and isotropic compression tests with various initial water content on remolded specimens and undisturbed samples were performed. All material parameters of Lade's single and double work hardening model were determined by using the result tests. Most aspects of the soil behaviour measured in the triaxial compression tests were reproduced with good accuracy by the constitutive model. Therefore single and double work hardening model has been shown to be applicable to weathered granite soil.