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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
Traffic Characteristics on Lane Drop Areas around Highway Work Zones
Kim, Dong-Nyeong ; Lee, Seung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 445~445
The capacity on lane drop area near the work zone is usually reduced comparing with basic section. It is because vehicles on the merging lane changes their direction to the adjacent lane. The decrease rate of capacity on Korean highway traffic conditions is needed. The study of capacity decrease on lane drop areas is necessary to evaluate the facility of bypass roads and to obtain travel time delays and for the purpose of traffic flow research. This study was done on uninterrupted highway work zones where the traffic queue exists at the upstream of survey points. Flow-speed relationship was modelled using the field data. The capacity calculated from the model was compared with average capacity from the survey data. The lane drop configuration is divided into two types. The first one changes from two to one lane and the second one changes from three to two lanes. The results of capacity was found as 1,500pcphpl for the former type and 1,820 pcphpl for the latter type which is equivalent to 68% and 83% of basic capacity, respectively. The former had similar capacity to foreign studies and the latter was appeared having bigger capacity by around 10%.
Quality Improvement of Cold-Recycled Asphalt Mixture for Domestic Application
Jeong, Kyu-Dong ; Lee, Soon-Jae ; Cha, Soon-Man ; Kim, Kwang-Woo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 463~463
This research was performed to evaluate applicability of cold-recycled asphalt mixtures, which was modified during recycling process, for bituminous-treated base course. A maximum size of 25mm reclaimed asphalt pavement (RAP) was used in cold-recycle process together with an asphalt emulsion as a binder. An unsaturated polyester was selected for the most effective polymer, and a 40% RAP content was found to be the most effective ratio for cold-mix recycle. Using this RAP ratio, various rejuvenator and polymer content combinations were examined to find out the best performing ratio(s). The mixture combinations of rejuvenator 10% and polyester 10%, and of polyester 10% without rejuvenator were selected as two of the best performing additive combinations. Two recycled mixtures were prepared using these ratios, respectively, and Marshall properties were evaluated. Two mixtures satisfied Korean specification limits for bituminous-treated base course. One of these materials was used in field trial application in a test pit. Evaluation of the field condition showed that the compacted mixture had excellent properties based on domestic specification. Therefore, it is concluded that the recycled mixtures by cold-mix method in this study were satisfactorily applicable for bituminous treated base course material.
Deformation Control by Aggregate Contact Increment in Asphalt Concrete Mixture
Kim, Kwang-Woo ; Li, Xiang Fan ; Lee, Jee-Yong ; Lee, Suck-Hong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 475~475
This study is to evaluate deformation behavior of asphalt mixtures which were prepared using new aggregate gradations developed to maximize contact among coarse aggregates particles. A gneiss aggregate and an asphalt(penetration grade of
) were used in this study. To minimize drain down of asphalt through the voids of coarse aggregates, to reduce voids, and to stabilize mixture, shredded paper (waste newspaper) was added to the mixture as a fiber. Marshall mix design was performed for selected gradations to determine optimum asphalt contents. Slab specimens were prepared for wheel tracking tests at
to evaluate resistance against rutting. The adjusted grade asphalt concrete mixture showed higher resistance against rutting than conventional dense-graded asphalt mixture.
A Study on the Automatic Classification of Watershed Runoff Coefficients from Landsat Data
Yang, In-Tae ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 485~485
The latest, Landsat data furnish many useful informations in study for global environment. Recently in Korea satellite data are using frequently for the study to the its applications in many fields. Especially, these offer considerable results in the environmental and hydrological investigation. In the past, an acquisition of the field data that are related to the landcover for hydrological study needed much cost, time and effort, because the parameters connected with landcover were acquired through the field survey or aerial photos to the full basin. But the remote sensed data have various advantages that it make to survey possible to the spatial changes accompany with time passage, that it offer the very useful information and that it can renew the landcover informations rapidly and periodically. The hydrological soil group and the landcover class are very important factors for the estimation of the flow ratio. The hydrological soil group are classified with information system and the landcover are analyzed from satellite images. This study is an attempt to extract runoff coefficients from relations between soil group and landcover to the known points, and then to classify automatically runoff coefficients to the unknown points with non-linear regression equation that is extracted from the relations between runoff coefficients and digital number of satellite images. In this study, the regression equation is derived from the multi regression analysis for a relation of runoff coefficient and the correlation of the visible three bands in 7 bands of Landsat TM.
Study on the Error Estimation in EDM Measurements
Lee, Seung-Chan ; Kim, Byung-Guk ; Kang, In-Joon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 495~495
Error estimation in EDM measurements was performed by baseline measurements. These baseline measurements were accomplished by modulation frequency measurements and laser interferometer measurements. The "Mekometer"(Leica ME5000) was used for the study, which is one of the best EDMs using the He-Ne laser as their carrier wave. The baseline measurements showed that the errors of Mekometer measurements were estimated as 0.13mm+0.28ppm, which were similar with the manufacturer's specification of 0.2mm+0.2ppm. The procedures of the measurements, the analysis method, and the results of error estimation including the principle of Mekometer measurement are described.
A 3-Dimensional Analysis for Assessing Change of Ground-Condition Ahead of the Tunnel Face
Lee, In-Mo ; Sohn, Young-Jin ; Park, Kwang-Jun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 505~505
An analytic method to predict the change of stiffness ahead of the tunnel face, and to predict the existence of fault zone by analyzing absolute displacements of a tunnel in 3-dimensions is presented. The excavation of the tunnel in a stable rock mass causes a 3-dimensional arching effect around the excavation face. The fact, that the change of ground condition ahead of tunnel face or the existence of a weak fault zone will make a typical displacement tendency, is observed by the 3-dimensional analysis. The ratio of L/C (longitudinal displacement at crown divided by settlement at crown) can be used for predicting the existence of the discontinuity in which rock mass stiffness changes, the ratio of S/C (horizontal displacement at sidewall divided by settlement at crown) for predicting dip direction of the discontinuity approaching the tunnel face during tunnel excavation. In addition, the plotting of influence and trend lines along tunnel axis, or the stereonet plotting of displacement vectors bring a better understanding of geomechanical profiles ahead of the tunnel face. Therefore, by monitoring the 3-dimensional absolute displacements during tunnel excavation, and by applying the analytic method proposed in this study, the change of ground condition and the existence of fault zone ahead of the tunnel face can be predicted.
Improvement Effect of Marine Clay in Yul-Chon by Quick Lime Pile
Chun, Byung-Sik ; Ko, Kab-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 521~521
The construction of industrial zone in Yul-Chon located in south seashore in Korea is going on the dredging and reclamation and the reclamation materials applied on this project was marine clay excavated so the settlement in long term caused by consolidation and bearing capacity of the ground are big issue. This study is research for application of quick lime pile method to the ground in Yul-Chon and the object of it is the analysis of the properties of soil in Yul-Chon and measuring the improvement effects caused by quick lime pile. Through this study it was proved that the moisture content of improved ground was decreased as
and the shear strength of it was increased as
times large as untreated one and the Korean quick lime has best quality so it is good for the materials for ground improving and the quick lime pile method will produce economical and excellent effects of improvement of marine clay in Yul-Chon.
The Evaluation of Toxic Effect of Grouting Materials by Fish Poison Test
Chun, Byung-Sik ; Kim, Jin-Chun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 531~531
As grouting materials for ground improvement, silicate materials such as water glass, silica-sol and so forth are used worldwide. However, they may pollute underground water. In this study, fish poison test(Korean standard industrial code KS M 0111) which estimates toxicity for fish is applied to evaluate the toxic effect by grouting materials. From the test result of the sample made of LW, LC50(Median Lethal Concentration) reaches within 24 hours. In case of the silica-sol, it does not even in 96 hours. Therefore, we can conclude that the sililca-sol grouting method is more free from the danger of underground water pollution. From the result the mortality of fish under the condition of pH 8.6 is 0% within 96 hours, the groundwater can be saved by controlling pH below 8.6 for the grouting in the field.
Nonlinear Finite Element Analysis of an Intrinsic Foundation Using Anisotropic Hardening Constitutive Model
Oh, Se-Boong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 539~539
Nonlinear finite element analyses of repeatedly loaded foundations were performed considering initial soil conditions and construction sequences. For the analyses, the anisotropic hardening elasto-plastic constitutive model based on the generalized isotropic hardening(GIH) rule was implemented into a nonlinear finite element analysis program. This anisotropic description of GIH can represent yielding in the field of reverse loading properly incorporating only a simple hardening function. In order to preserve the accuracy of the finite element solution for nonlinear problems, an implicit stress integration algorithm was employed. A consistent tangent moduli could also ensure the quadratic convergence of Newton's method. As a result, the nonlinear solution was accurately calculuated and was converged to be asymptotically quadratic in the problem of vertically loaded foundation. In repeatedly loaded foundation, vertical or horizontal response was analyzed comparing with results using the Cam-clay type models and the plastic straining mobilized in overconsolidated state and various loading sequences could be represented successfully by analyses using the GIH constitutive model.
Prediction of Bearing Capacity of Piles under Downdrag Loading
Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 553~553
In this study the bearing capacity of a single pile is investigated by considering the effect of downdrag on a pile. The downdrag analysis was performed based on the load transfer curves proposed by Vijayvergiya, Alonso, and Castelli which are applied to calculate the bearing capacity that takes into account the plastic movement at the pile tip. The response of a single pile is analyzed and compared with the results of field case study. Based on the results obtained, it is found that the ultimate capacity of a pile subjected to negative skin friction is reduced significantly with plastic movement, whereas without plastic movement ultimate capacity is same whether there is negative skin friction or not. It is also found that the settlement required to reach ultimate bearing capacity with negative skin friction is increased. This yields to a smaller structural load for allowable settlement of 25 mm or 10% of pile diameter, and thus the bearing capacity of a pile subjected to negative skin friction can be controlled by settlement criterion.
Behavior of Footings on Sand Layers Overlying Soft Clay
Yoo, Nam-Jae ; Holtz, R.D. ; Kang, In-Goo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 567~567
A series of model footing tests on sand layers overlying soft clay under 1g and increased gravitational environments was carried out to investigate the characteristics of load-settlement curves, bearing capacity, and failure mechanism with ground deformation. Tests at 1g were performed with changing thickness and relative density of the overlying sand, the width of strip footing and the preconsolidation pressure applied to the soft clay layer. Centrifuge tests were also carried out with changing g-level and the selfweight consolidation time of the soft clay. From test results, it was found that the bearing capacity increases with increasing relative density of the sand layer, the sand thickness-footing width ratio, undrained shear strength of soft clay related to its preconsolidation pressure, the g-level applied and selfweight consolidation time of soft clay. A punching shear failure mechanism, where a truncated cone shaped sand block between the footing base and the clay surface penetrates into clay, was observed. The load spread angle. which is the side angle of sand block to the vertical, was observed to increase with increasing relative density of sand, sand thickness-footing width ratio and g-level applied, and decreased with the undrained shear strength of the underlying soft clay. Bearing capacities from test results were compared with estimations using various load spread models and the punching shear model. Predicted results using the punching shear failure model with an assumption of general shear failure mode are in good agreement with test results. For load spread models to predict a bearing capacity, appropriate choice of load spread angle is recommended for a conservative design because of the various factors affecting its value.
A Theoretical Study on the Static and Dynamic Earth Pressure for Double -Wall of Earth Structure
Kim, Hoon-Je ; Lee, Hyoung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 583~583
This study was undertaken to investigate the characteristic of static and dynamic earth pressure effect to an acting wall when another wall behind the earth structure. A Theory calculating static and dynamic earth pressure for the ratio(B/H) of the distance between two Wall(B) to the original Wall height(H) was proposed. A Theoretical static earth pressure was derived from Coulomb's theory of earth pressure and a theoretical dynamic earth pressure was derived utilizing the boundary condition of Mononobe-Okabe's theory based on seismic coefficient method.
The Experimental Study on Time Dependent Behaviour of Reconstituted Marine Clayey Soil
Kim, Soo-Sam ; Jung, Seung-Yong ; Koh, Kyung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_4, 1998, Pages 593~593
This research is focused on the creep behaviour introduced with the time-dependent unrecoverable strain concept in order to describe the long-term settlement characteristics under the constant load which is lower stress level than failure strength. Totally, twenty two series of isotropic consolidation tests, constant-strain controlled test and constant-stress controlled test have been carried out for reconstituted samples in drained or undrained condition. In this study, test procedures and methods were proposed for more improved quality of test results. And new loading apparatus for creep test was designed for more precise evaluation of undrained creep behavior of soils. Based on the test results from above experiments, the relations of stress and strain were investigated to analyze the time-dependent characteristics of reconstituted marine clay. From the test results of reconstituted Nok-san marine clay, soil parameters for critical state analysis and creep parameters were obtained and the effect of variation of shearing speed on the undrained stress path was analyzed. By the back analysis on the stress path of creep behavior, the time dependant behavior of the soft marine clay was confirmed. Comparing the test results from the constant strain and constant-stress controlled test with the conventional theories, undrained stress-path of the soil is in accord with the theoretical values of modified Cam-clay method and the axial strain of creep behavior corresponds to Singh and Mitchell's equation. Accordingly, the estimation of the long term behavior of soft marine clay using the constitute equation combining with above equations can be expected.