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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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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
Selecting the target year
A Theoretical Study on Right Turn Adjustment Factor at Signalized Intersection
Doh, Tcheol-Woong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 315~315
In capacity and level of service analysis at signalized intersection, calculating right turn adjustment factor is the most likely cumbersome work. Though the USHCM (1994 ed.) was modified from the 1985 ed. in terms of those parts. some variables should be determined by field observation. In case of Japan. the procedures are very simple but they have some theoretical errors in which the factors for exclusive right turn lane and shared lane are identical. This study developed mathematical models to calculate the proportion of right turn in shared lane only and through-equivalent of right turn using the time proportion of right turn being impossible to turn due to conflicting pedestrians in permitted phase. The variables affecting right turn adjustment factor are the time proportion of right turn being impossible to turn due to conflicting pedestrians in permitted phase, traffic volume of each movement the number of lanes on the approach. and cycle length. As the first variable and right turning volumes increase. the right turn adjustment factor decreases. On the other hand, as through and left turn volumes increase. the factor increases. Cycle length dose not largely affect the factor, but the factor has a tendency to increase as the cycle length increases.
Marshall Properties of Modified Asphalt Mixtures
Park, Tae-Soon ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 323~323
The Marshall method was used to determine the optimum binder content. and mechanical properties and void relationships in this study as additives are included in asphalt mixtures. Two modified (CB and CBp) asphalt mixtures were tested to investigate the effects of two additives. Analyses of variance and LSD(T) method were employed to find out whether design factors: additive types and contents, are significant for the response dependent variables: air voids. VMA, Stability and flow. The test results showed that air voids and VMA generally increase with increasing additive contents except few digression. The Marshall stability of the CBp modified mixture is almost the same as that of the CB and conventional unmodified mixtures. The most significant improvement of the modified mixtures is that the rate of reduction of the Marshall stability with decreasing air voids is not severe as that observed in the conventional mixtures. ANOVA presented that the effects of additive for the Marshall properties (air-voids, VMA, stability and flow) are the identical and the additive contents, 5% and 10% are homogeneous group.
An Analysis on Characteristics of Resilient Modulus for Asphalt Concrete Mixture
Lee, Kyong-Ha ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 337~337
Resilient modulus, one of asphalt concrete mixture properties, is the property which evaluates defomation characteristics under repeated load, and it is used for pavement design and performance evaluation. In this study. resilient characteristics of asphalt concrete were evaluated by resilient modulus test with variables such as aggregate. asphalt type. asphalt content and temperature. Analysis of Variance tests for the laboratory test results show that the effects of temperature. aggregate, type of binder, asphalt content, temperature, type of mixture are significant and temperature is the most important factor affecting the resilient modulus. The two way interaction analysis show that aggregate is important significant factor. The estimation model of resilient modulus is proposed based on resilient modulus test results, using multiple regression analysis with variables such as temperature, density. and mix type. The proposed models were comparised with existing model and varified by executing tests on field core specimen.
Performance and Characteristics of Recycled Concrete Aggregate as Base and Subbase Material
Park, Tae-Soon ; Kim, Moo-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 349~349
This research presents the test results of the laboratory and field studies that have been performed to address concerns about the use of recycled concrete aggregate (RCA) as base and subbase materials in pavement structure. Performance concerns have focused on compactability. stability shear resistance and breakage of the RCA in the laboratory using the U. S. Army Gyratory Testing Machine (GTM). The tests conducted both in dry and wet conditions. The tests results showed that the RCA performed much better than the gravel in both conditions and equal to the crushed stone aggregate. A field study conducted the vicinity of Indianapolis. where the I-70 freeway connects the Indiana state with the Ohio state. The RCA was used as base and subbase materials for concrete pavement. The length of demonstration pavement was approximately 10 Km. The falling weight deflectometer (FWD) was used to measure the deflection of the pavement both of the RCA and crushed stone aggregate section. The radius of relative stiffness (lk) showed that the RCA is capable of resisting the traffic load and showing the long-term stability.
Application of Digital Photogrammetry and Computer Graphics for Urban Landscape Analysis
Yoo, Hwan-Hee ; Song, Young-Sun ; Sung, Min-Gyu ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 363~363
Computer graphics for landscape analysis have been insufficiently developed and landscape analysis is still being done by hand drawing and on-the-spot survey in general way. To get a good view from specific point in the city, we need to control height, size. and shape of building with respect to surroundings. In this paper. the S/W for 3D positional information acquisition was developed by using digital photogrammetry to get the information of building. road, and topography in the city. Also. in order to automatically analyze landscape to use the data acquired from this S/W, we tried to integrate with AutoCAD by using AutoLISP. The 3D positional information acquisition S/W which was developed in this study is very useful to get the data for landscape analysis compared with on-the-spot survey. 3D perspective view and 3D animation using the computer graphics were efficient to analyze landscape and skyline in the city.
An Experimental Study on the Mechanical Properties of Guide Wall in the Slurry Wall Method
Koo, Ja-Kap ; Yoo, Beom-Shik ; Lee, Sang-Duk ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 371~371
In this study, the accurate failure mechanism of the Surry Wall based on the depth of foundation and the distance between a footing and a Guide Wall was analysed to consider an influence of the Guide Wall and the adjacent structures on the Slurry Wall and the roles of the Guide Wall in the Surry Wall Method. The displacement of foundation soil in the laboratory model test was measured by the observation of the movement of carbon rods. The failure mechanism of the Guide Wall showed a deeper failure wedge than that of the case without the Guide Wall. The fact that passive failure occured between the Guide Wall and the adjacent structures and this failure made verified that the Guide Wall has decisive influence on the failure mechanism of the trench. As being the depth of an adjacent footing was shallower than that of the Guide Wall. the magnitude of the load acting on the Guide Wall was increased. But when the depth of the footing was equal to or larger than that of the Guide Wall. it showed that the load acting on the Guide Wall had nothing to do with the distance between the footing and the Guide Wall.
A Numerical Analysis on the Deformation of Decomposed Granite Soil Foundation Using Lade Model
Shin, Bang-Woong ; Lee, Kwang-Dong ; Jeong, Tai-Wook ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 381~381
This paper aimed at predicting the behavior of deformation of decomposed granite soil foundation using elasto-plastic constitutive model that proposed by Lade. Sample soil is weathered granite soil that be founded at Cheong-ju district. To determine soil parameters, isotropic consolidation tests and cylinderical triaxial compression tests are performed, at this time it was maintained compaction energy of 95% on the laboratory testing in order to regulate fracture effect by virtue of the compaction. In the deformation analysis of foundation, it was vertified by the model loading test through centrifuge test that maintained stress in situ as being laboratory test that deformation value of foundation was predicted. Basic physical properties is determined by geotchnical tests, and for application of constitutive model with multiple intersecting yield surface, it keep constant compaction energy and then determined soil parameters (14) needed in constitutive model. The centrifuge test was tested for behaviour analysis of foundation.
Alternative Method of Determining Resilient Modulus of Subgrade Soils Using Free-Free Resonant Column Test
Kim, Dong-Soo ; Kweon, Gi-Chul ; Lee, Kwang-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 393~393
AASHTO has adopted the use of resilient modulus (
) in the pavement design to represent the deformational characteristics of pavement materials. In order to develop an intrinsic pavement design guide based on Korean pavement conditions. the characteristics of resilient moduli of subgrade and subbase soils should be intensively studied. However, difficulties and complexities in performing
testing and a high cost of the testing system have kept
test from using a routine test in the Korean Highway Corporation. Therefore. the development of an alternative
testing technique. which is simple and reliable, is essential to the application of'86 AASHTO design guide in Korea. In this study. the alternative
testing techniques for subgrade soils were developed using a free-free resonant column (FF-RC) test. In order to evaluate the effects of strain amplitude. loading frequency and number of loading cycles (which are the key variables) on the characteristics of resilient modulus, the resonant column/torsional shear (RC/TS) tests and standard
test were also performed. Synthetic specimens of known stiffnesses ranging from those of soft subgrade soils to subbase materials were developed, and the entire testing systems of FF-RC, RC/Ts,
tests were calibrated using synthetic specimens. The alternative
testing procedures using FF-RC test were proposed. and the predicted
values on subgrade soils matched well with those determined by standard
test, showing the capability of the proposed method being used in determining
Adsorption Characteristics of Contaminants on Soils with Various Organic Carbon Contents
Park, Jun-Boum ; Song, Young-Woo ; Kwon, Ho-Jin ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 403~403
A porous medium such as soil is capable of capturing and trapping organic compounds from a fluid in its pore spaces while permitting the fluids to pass through. Depending on the specific physico-chemical properties of the organic contaminants and the soil, contaminants can be adsorbed on the soil-fluid interface or incorporated into the soil matrix. This is called 'adsorption' and it affects the movement of contaminants in subsurface. Batch adsorption rate tests and Freundlich adsorption isotherm tests were performed for phenol, aniline, nitrobenzene, quinoline, and 2-napthol. Distribution coefficient,
, for phenol (20 mg/L), when adsorbed onto
, was 0.15. and, when adsorbed onto
, was 0.57. The relationship between the organic carbon content.
, and the distribution coefficient,
, is approximately linear relationship. As
increases, the retardation factor, R, also increases, thus the mobility of the contaminant becomes reduced.
Mechanical Properties of Grounds Improved by High Pressure Jet-Grouting
Hong, Won-Pyo ; Yun, Jung-Mann ; Kim, Dong-Wook ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 415~415
The grouting columns are built in ground by jet-grouting for reinforcement of ground and cut-off of ground water behind the temporary retaining wall. A series of mechanical tests in laboratory were performed on the specimens sampled from grouting columns, in order to investigate the factors influenced on strength of the grouting columns. The strength of grouted ground was affected by strength of original grounds. jet- pressure, jetting method and ground water. The strength of grouted ground was increased in proportion to N-value of original grounds. jet-pressure and density of improved ground. The strength of grouted ground, however, was decreased with increment of water content in the ground. The unconfined compressive strength and the tensile strength of grouted ground in moisture state were about thirty percents less than those in dry state.
The Behavior of Very Soft Ground with Cement-Stabilized Surface Layer (I) - Model Tests -
Hong, Won-Pyo ; Kim, Du-Young ; Yun, Jung-Mann ; You, Seung-Kyong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 425~425
In recent, there are several attempts to use a lot of dredged and reclaimed soft grounds in both western and southern coasts in Korean Peninsula for various purposes by improving the properties of the soils. The surface layer in dredged and reclaimed soft ground is improved by mixing of the soft soils and hardening agent, which is made of cement with some other special admixtures. A series of model tests in laboratory was performed to investigate the behavior of the soft grounds with cement-stabilized surface layer The load-deformation behavior illustrated the load-carrying capacity of the cement-stabilized layer and the deformation properties of the soft grounds such as settlement. heaving and lateral flow. The test results showed that the load-carrying capacity of the improved grounds was increased with curing time of the cement-stabilized soil layer. Also the soft grounds with the higher water contents produced the more settlement of the stabilized soil layer and the more heaving and lateral flow of the soft grounds.
The Behavior of Very Soft Ground with Cement -Stabilized Surface Layer (II) -Field Tests-
Hong, Won-Pyo ; Jin, Sung-Gi ; Park, Kyung-Tae ; Lee, Jong-An ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 435~435
The surface layer in dredged and reclaimed soft grounds should be improved first to increase their load-carrying capacity and resistance to physical stresses induced by various construction vehicles used for soil improvement of deep layer. In this case, the surface layer is improved by in-situ mixing of shallow soils and harding agent, which is made of cement with some other special admixtures. A series of field tests were performed to investigate the engineering and mechanical properties of cement-stabilized soils such as strength, elastic modulus and bearing capacity. The test results showed that the improved strengths of cement-stabilized soils in field were increased with curing time. And the bearing capacity of the surface layer in dredged and reclaimed soft grounds was increased so much. The effect of improvement of the surface layer in the dredged and reclaimed soft ground was very good.
Inversion Technique for the Evaluation of Stiffness Profile from SASW Measurements
Joh, Sung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 443~443
SASW method, which evaluates stiffness profile nondestructively and noninstrusively using stress waves. has advantages to be performed without boreholes and with expedition. However, the analysis of SASW measurements is not an easy task, which requires an expert's expeience. Specialty, the evaluation of stiffness profile from experimental dispersion curves should be performed using an iterative forward modeling if dynamic stiffness matrix approach is incorporated in modeling. Therefore, the procedure of stiffness profile evaluation is time-consuming and the resulting profile lacks reliability. This study proposed new inversion techniques called global inversion and array inversion to evaluate a stiffness profile from experimental dispersion curves. The proposed inversion procedure directly evaluates a stiffness profile from experimental dispersion curve without iteration and eye-ball matching of theoretical dispersion curves and experimental dispersion curves. As a result. the SASW technique can be applied to geotechnical problems more practically and the evaluated stiffness profile from SASW measurements turns out to be more reliable.
Factors Influencing the Inversion Analysis of SASW Testing
Joh, Sung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 453~453
The Spectral-Analysis-of-Surface-Waves(SASW) method has been successfully employed in many geotechnical environments to non-intrusively determine the shear stiffness profile of these sites. SASW testing determines the phase velocity dispersion curve based on the measured phase difference between surface wave motions at two or more receiver locations. The determined phase velocity dispersion curve is employed for inversion analysis to evaluate stiffness profile. Since inversion analysis is a complicated procedure which is influenced by many factors, it is essential to investigate these factors for better evaluation of stiffness profile. In this study, the investigation was focused on three factors: 1. the data distribution in the representative dispersion curve, 2. the layering of the preliminary profile and 3. the uncertainty in the data and model parameters. After 2500 forward modeling analyses and a series of global inversion analysis. a guideline leading to more effective inversion analysis was presented.
A Study on Strain Rate of Embankment on Soft Clays(I)
Park, Sung-Zae ; Cho, Kyoung-Tae ; Jeong, Gyeong-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 463~463
Large ground strains occur when fills and superstructures are constructed on soft clays. Large lateral movements and vertical settlement will influence the stability of the superstructure and other structures nearby. To avoid these kinds of problems. we must study how loading fills and rate of loading affects the behavior of soil. Due to a short period of research we must determine whether the estimated strain has overcomed the design criteria. we must also determine whether foreign design criteria are appliable to the domestic soil condition to minimize construction cost. In order to solve these problems. we must study the rate of shear-strain and rate of shear crack development. Based from the results that we have obtained we must develop the method of stab-ility in soft clays. Thus, SSV (Version 1.0) program was developed to measure the rate of shear-strain for this kind of soil condition and behavior This is the major one of EMMS (Embankment Monitoring System) for the control of embankment on the soft ground.
The Engineering properties and Effectiveness of Polyurethane for Ground Reinforcement
Chun, Byung-Sik ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 475~475
The polyurethane injection method has been commonly used as the method for stiffening rockbase in tunnel excavation work. Recently it is inclined to be used as supplementary method to soil nailing system in Korea. This study investigates the phyical, chemical and mechanical characteristics of polyurethane injection material and the effectiveness of ground improvement related to the reinforcing performance. In the application of polyurethane injection method on the slope of soil mass reinforced by nailing. the field and laboratory tests were performed to measure the frictional increment of nail on original ground and urethane injected ground. The frictional increment each ground condition is compared by measurements of the ground deformation. For tunnel excavation, analysis is performed to show the effect of the ground reinforcement. It is proved that soil nailing by urethane reinforcing is effective on repressing the ground deformation. And the analysis shows that urethane injection method reduces convergence, crown and ground surface settlement of tunnel.
Study on the Proposition and Application of EPS Model
Chun, Byung-Sik ; Lim, Hae-Sik ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_4, 1997, Pages 485~485
Recently, EPS which has unit weight of only
. is used as one of the methods acquiring the safety for settlement and bearing capacity. However, there is no rational application for the selection of the EPS fill which is essential for the selection of the filling configuration and the settlement calculation. In this point of view, this paper executed triaxial compression test on EPS. Through the analysis of test data. this paper proposed the nonlinear model describing the behavior of EPS. The nonlinear numerical model is applied to the construction of EPS and to the large scaled model test in Japan and verified through the comparison between the prediction and measurements.