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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
Selecting the target year
A Study on Development of an Optimal Subway Routing
Park, Chang-Ho ; Lee, Sung-Mo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 1~1
Subway, which is together with bus the main part of public transportation modes in the city, is reviewed for the development of an optimal subway routing. The location, route and stations of existing subway are often, in some degree, determined on the basis of political motive rather than scientific and reasonable background, resulting in a subway system of ad hoc manner. Assuming the section-wide total demand and considering construction, operating and opportunity cost of subway users, the development of a model for deciding optimal route, location of stations and operating frequency of subway and their solutions under system optimal are suggested. With the determined stations, and considering user demand distribution, optimal spacing strategies are suggested. The model developed in this paper is useful in the case of extension and opening of subway and urban express bus route and new transportation systems.
Research on Improvement of Asphalt Pavement Section Taking Advantage of Layered Elastic and Visco Elastic Analysis
Lee, Kyoung-Ha ; Lee, Kwang-Ho ; Jeon, Mong-Gag ; Yoo, Chung-Sik ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 13~13
Asphalt pavement structures have the possibility of rutting under high temperature conditions and cracking under cold temperature conditions. Particularly, the four distinct seasons in Korea give bad effects on performance. In this study, the typical sections that may minimize rutting and fatigue are analyzed through the numerical model tests. The layered elastic theory and visco elastic theory are utilized for these numerical model tests. The layer properties of pavement structures are estimated from domestic materials. From the various numerical model tests, it is found that a design procedure by increasing the thickness of asphalt stabilized base with fixed 5 cm wearing course as the minimum specified thickness is more beneficial to mitigate rutting and prolong fatigue life.
The Improvement of the Three Dimensional Positioning Accuracy of Aerial Triangulation by the Bundle Block Adjustment
Lee, Jong-Chool ; Nim, Young-Bin ; Shin, Sang-Cheal ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 27~27
In this study, the accuracy of three dimensional positioning was improved by the bundle block adjustment with additional parameters, which are able to correct systematic error through detection and elimination of the gross error for observation values in aerial triangulation. In performance of the different weighting schemes by the robust estimation method, the gross error was detected conveniently. And also, the different control point patterns, overlaps, and the twelve types of additional parameters were used for comparison analysis. As a result, it is expected that the sequential procedure of analysis can be effectively utilized in the accuracy analysis of aerial triangulation.
Development of Real-Time Mapping Software Using the Digital Photogrammetry
Yoo, Hwan-Hee ; Kim, Eui-Myoung ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 37~37
Digital Photogrammetry is rapidly developing as a new subfield of photogrammetry, and a number of research projects focus on the development of real-time mapping technology using digital photogrammetry. Also, video cameras are widely used recently. Much information can be obtained by analyzing digital images captured by video cam eras. In this study, software was developed using Borland C++ and Assembly Language to extract automatically three dimensional coordinates from video images. The results of this research are as follows: First, parameters for distortion corrections and orientations of video images are estimated by using Direct Linear Transformation. To improve the 3-dimensional positioning reliability, we suggested an algorithm to minimize the searching area and determine the epipolar line by the coplanar condition in the stereo image matching. Second, in order to analyze the accuracy of 3-dimensional positioning on the stereo images, which are displayed at the same time on a computer monitor, effects for various sizes of target windows in image matching, as well as effects for self calibration in bundle adjustment, are analyzed. The results are encouraging and expected to be used as data for general planning in construction work. Also, the algorithm which we developed is expected to be utilized to develop technology for matching stereo images faster and more accurately in construction of real-time mapping system.
A Study on the Limit Values of Field Measurement in Subway Tunneling
Chun, Byung-Sik ; Nam, Soon-Sung ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 47~47
Large scale subway projects are under planning or being carried out in big cities in order to solve the heavy traffic congestions. For this purpose, subway should be constructed and designed to run through the downtown area and under the built-up areas. Thus, the ground deformation which resulted from the subway construction has to be limited. The engineers pay attention to monitoring and analyzing the ground behaviour to protect the existing high-rise buildings and structures. In addition, because the subway tunnel construction applies the NATM technology, the importance of ground behaviour is emphasized. In Korea, there are large number of experiences in the tunnel construction using NATM technology for the relatively short period. However, a study in the determination of the limit value of field measurement for construction in built-up areas has not been properly performed. In this study, the existing technique for the selection of limit value for safe tunnel construction are evaluated and the appropriate limit value of field measurement of the crown settlement and the convergency of the Seoul subway tunnel support pattern PS-3 and PS-4 the weathered rock and soft rock areas is suggested by comparing the results of elastic analysis and the actual measured data.
Development of Some Empirical Correlations in Overconsolidated Clays
Yoon, Gil-Lim ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 61~61
The purpose of this paper is to develop site-specific empirical correlations and to evaluate the existing correlations for Overconsolidation Ratio (OCR) and Coefficient of Lateral Earth Pressure at Rest (
) in terms of a data base study in desiccated, overconsolidated clays. Large data base of Cone Penetration Test (CPT) and Flat Dilatometer Test (DMT) were used in estimation of
values and OCR values. Previous published empirical correlations and representative OCR values from
triaxial test and one-dimensional consolidation test were used as reference in order to develop site specific correlations. The developed empirical correlations for
and OCR values were compared with other in-situ laboratory test results. In addition, a simple method to determine
values from cone sleeve friction (fs) suggested by Masood and Mitchell (1993) was also evaluated and proved to be promising method in a desiccated, overconsolidated clays.
A Study on the Method for Underground Structure Analysis at Great Water Pressure
Chung, Hyung-Sik ; Hwang, Young-Cheol ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 73~73
The rock mass has an anisotropic aspect due to existence of discontinuity. In case of excavation at great depth, anisotropy of rock is more clear. Because the difference between Intact rock and joint strength is large. Also, the deeper, the higher hydraulic pressure on rock joint is. Hence influence on hydraulic pressure should be considered. This study compared result of stress analysis as continuum with result of analysis considering of slip behaviour as discontinuum. Also, the purpose of this study is to present data about excavation analysis plan at great depth. When the ground was assumed as homogeneous continuum, hyperbolic model used in stress analysis. When rock was considered as discontiuum, slip failure condition by Jaeger was used. As a result of analysis, failure region of rock mass was very different by analysis method and water pressure. Also, when the slip failure of joint was considered, the stability was influenced by strike & dip direction of joint and principle stress direction of ground. Hence direction of discontinuity and shape of underground structures should be considered for stability.
A Reliable Resilient Modulus Testing Technique on Subgrade Soils
Kim, Dong-Soo ; Kweon, Gi-Chul ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 81~81
Accurate measurement of laboratory resilient modulus (
) is quite difficult because of the small values of stress and strain typically involved and the need to eliminate equipment compliances. Synthetic calibration specimens with known stiffness characteristics was beneficial in evaluating and calibrating overall
measurement with specimen grouting to the end platens with hydrostone paste was utilized in this study. The effects of specimen grouting and the stiffness range on reliable external
measurements was investigated using six synthetic specimens of known stiffness ranging from that approximating a very soft subgrade to that approximating very stiff base materials (from 20.7 MPa to 552 MPa). For the stiffness below 345 MPa.
values determined by external measurements with specimen grouting are identical with the known moduli from torsional testing. However, for the stiffer specimens,
values of the grouted specimens are less than those from torsional testing and the deviation increases as increasing stiffness of the specimen. The secant static moduli determined by both loading and unloading curves closely matched the cyclic
at the same strain rate (or loading frequency), proving the feasibility of utilizing the static testing scheme over high-costcyclic test. Finally, the effects of specimen grouting on static modulus and cyclic
measurements were also investigated using compacted subgrade soils.
Elucidation of Cut-off Characteristics of Ian Underground Dam using the Three-Dimensional Flow Model
Shin, Bang-Woong ; Kim, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 93~93
Characteristics of underground watertable, soil type of aquifer, underground geology of aquifer systems, and dewatering effect in dam should be analysed to estimate the function of underground reservoir. However, the in situ tests of point source do not give us representative soil properties, so water balance analysis of simulation is determined constructing 3-dimension underground flow model. In this study, to analyse quantitatively dewatering effect of underground dam of Ian, Kyungbuk province by the injection grouting method, the in situ tests of pilot hole yield hydraulic conductivity(k), storavity(S), porosity(n) etc. Water balance was determined before and after dam is built, and sustainable yield of groundwater is calculated through simulation. According to the height of underground dam, the results of simulation have constant outflux through the unit area. In the simulation for dewatering effect, the results of simulations at 7 steps of hydraulics are as follows. In the case over
, outflux amount increased through unit area as conductivity increases, but in the case under
, outflux amount kept steady even conductivity decreases. The results can help determine limited conductivities of soil of dam in this area. This simulation model gives us optimum value of conductivity tests for embarkment with grouting enforced. and test after undergound dam constructed, etc.
Finite Element Analysis for the Soil inside the Sampling Tube Penetrating into the Ground
Lee, Yeong-Saeng ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_1, 1996, Pages 111~111
A finite element method was used to analyze the degree of the ground disturbance due to the sampling tube penetrating into the ground. By analyzing these results, the proper tip shape of the sampling tube can be determined and the availability of the in-situ test can be investigated. By the results of this study, the soil sample moving into the sampling tube experiences a compression-swelling-recompression. And the disturbance of the soil sample can be minimized by applying the pressure around the soil sample.