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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geotechnical Society
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Korean Geotechical Society
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Volume & Issues
Volume 24, Issue 12 - Dec 2008
Volume 24, Issue 11 - Nov 2008
Volume 24, Issue 10 - Oct 2008
Volume 24, Issue 9 - Sep 2008
Volume 24, Issue 8 - Aug 2008
Volume 24, Issue 7 - Jul 2008
Volume 24, Issue 6 - Jun 2008
Volume 24, Issue 5 - May 2008
Volume 24, Issue 4 - Apr 2008
Volume 24, Issue 3 - Mar 2008
Volume 24, Issue 2 - Feb 2008
Volume 24, Issue 1 - Jan 2008
Selecting the target year
Comparison of Shear Behavior for Quarry Blasted Rocks Based on Large Scale Direct Shear Test and Large Scale Triaxial Test
Lee, Dae-Soo ; Kim, Kyoung-Yul ; Oh, Gi-Dae ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 5~14
Shear characteristics of quarry blasted rocks were compared using large scale direct shear tests and triaxial tests. For comparison purpose, similar test conditions were simulated as much as possible and three types of relative density (50%, 70%, 90%) were employed for the test. Results indicate that stress-strain behavior shows the same trend for two tests, but the measured shear strengths differ for the different test ms and depends on the relative density. At low relative density, the internal friction angles from direct shear test are smaller than those from triaxial tests. However, at high relative density, this phenomenon is reversed.
A Study on the Characteristic of Floating Base Plate due to Plate Shape
Lee, Song ; Jeong, Dae-Yeol ; Jung, Hyo-Kwon ; Lee, Moo-Cheol ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 15~25
A soft ground improvement method is used for structures which are constructed on soft ground to decrease settlement and Increase bearing capacity. The Floating Base Plate has been developed for such purposes. In this study, the load-settlement characteristics were investigated by numerical analysis on various Floating Base Plate shapes to select an optimum shape, different from the conventional shape. The selected optimum shape was used to perform plate bearing test and numerical simulations. It was found that the Floating Base Plate is very effective In reducing the settlement and increasing the bearing capacity.
A Study on Deformation Analysis of the Earth Retaining Wall
Lee, Song ; Kim, Seong-Koo ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 27~36
This paper analyzed the effects related to the difference of the geometrical shape of the ground excavation by comparing the displacements of the earth retaining wall of the strut resulting from the change of the excavation breadth B and the excavation length L, adopting the three dimensional FDM analysis. It appeared that the displacement of the earth retaining wall of the strut increases in accordance with the increase of L/B and it decreases as it becomes nearer from the center to the comer where the temporary structural system forms, and the wale member is closured because of the effects of the confining effect by the closure of the earth retaining wall and the wale member. This paper proposed a formula in which the results of three dimensional FDM analysis which considers the shape of the excavation plane can be obtained from those of two dimentional FDM analysis which does not consider the shape of the excavation plane. And the results of the formula were compared with those of the site instrumentation analysis.
A Study on the Domestic Cut Slope Management Plan Reflecting Quality according to Rock Types
Shin, Chang-Gun ; Lee, So-Young ; Lee, Song ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 37~44
The collapse of the cut slope occurs owing to mixed effect of many variable factors such as geological, geographic, and hydraulic factors. Nevertheless, it is very difficult to evaluate the influence of the complicated geological factors on the stability of the cut slope during various management stages. This study proposes a management plan for domestic cut slope for a series of the rock masses, based on the collapse charateristics of various rock masses and management case studies.
Roadbed Behavior in Managanese Crossing of Turnout System
Jeon, Sang-Soo ; Eum, Ki-Young ; Kim, Jae-Min ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 45~57
The improved turnout system is developed to speed-up the pre-existing railroad. The research has been actively carried out far the improved turnout system and the impact factor is estimated using the data sets achieved from the dynamic wheel-load field tests in both the conventional and the improved turnout system. In this study, the track performance and roadbed behavior are examined for the conventional and improved turnout system using the estimated impact factor. Dynamic wheel load and rail pressure are evaluated to assess the track performance. Roadbed stress and settlements are estimated using numerical analysis. Additionally, the stability of roadbed is estimated in soft roadbed condition influenced by the weather effects and cyclic train loading. The results show that dynamic wheel load, rail pressure, roadbed stress, and roadbed settlements in the improved turnout system substantially decrease compared with those in the conventional turnout system.
The Behavior Measurement of Simulated Ground by Digital Close-Range Photogrammetry
Lee, Hyo-Seong ; Ju, Jae-Woo ; Jung, Jae-Sung ; Ahn, Ki-Won ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 59~65
Digital close-range photogrammetric technique can measure and describe 3D geometric farm from 2D image. This technique is increasingly applied in the field of sciences. In the fields of civil and mechanical engineering, which need precise measurements for design, expensive measuring equipments are widely used. In occasions where visual inspection is required in addition to other forms of measurements, appropriate measuring equipments have not been yet available. This study utilizes digital close-range photogrammetric technique to quantitatively analyze behavior patterns before and after destruction from test model of reinforced-soil wall. Then the results are compared with the measurements obtained using digital theodolite to verify the reliability of the proposed method.
Fluid Injection Simulation Considering Distinct Element Behavior and Fluid Flow into the Ground
Jeon, Je-Sung ; Kim, Ki-Young ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 67~75
It is interesting to note that distinct element method has been used extensively to model the response of micro and discontinuous behavior in geomechanics. Impressive advances related to response of distinct particles have been conducted and there were difficulties in considering fluid effect simultaneously. Current distinct element methods are progressively developed to solve particle-fluid coupling focused on fluid flow through soil, rock or porous medium. In this research, numerical simulations of fluid injection into particulate materials were conducted to observe cavity initiation and propagation using distinct element method. After generation of initial particles and wall elements, confining stress was applied by servo-control method. The fluid scheme solves the continuity and Navior-Stokes equations numerically, then derives pressure and velocity vectors for fixed grid by considering the existence of particles within the fluid cell. Fluid was injected as 7-step into the assembly in the x-direction from the inlet located at the center of the left boundary under confining stress condition,
, respectively. For each simulation, movement of particles, flow rate, fluid velocity, pressure history, wall stress including cavity initiation and propagation by interaction of flulid-paricles were analyzed.
Development and Application of Ultra Small Micro-Cone Penetrometer
Lee, Jong-Sub ; Shin, Dong-Hyun ; Yoon, Hyung-Koo ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 77~86
The disturbance zone and measured values are affected by the size of the penetrometer. The local value may be measured by the smaller penetrometer. An ultra small Micro-Cone penetrometer (5mm in outer diameter) is designed and manufactured to characterize soil properties with minimum disturbance during penetration tests. The tip resistance is measured by using stain gauges attached near the Micro-Cone. In addition, the friction sleeve is adopted to effectively remove the skin friction from the tip resistance. Design concern includes the installation of stain gauges, circuits, penetration systems, penetration rate, sampling rate, operating temperature, and calibration. Application tests show that the clay interface, and the soil layers consisting of clay and sand are clearly detected by the Micro-Cone. Furthermore, the cone tip resistances measured by the Micro-Cone and the miniature cone (16mm in outer diameter) are similar. Note the resolution is much higher in the Micro-Cone. This study shows that the Micro-Cone may effectively detect the soil interface with high resolution, and with minimum disturbance.
Elastic Wave Characteristics in Cemented Engineered Soils
Lee, Chang-Ho ; Yoon, Hyung-Koo ; Lee, Woo-Jin ; Lee, Jong-Sub ;
Journal of the Korean Geotechnical Society, volume 24, issue 2, 2008, Pages 87~97
Behaviors of cemented engineered soils, composed of rigid sand particle and soft rubber particle, are investigated under
condition. The uncemented and cemented specimens are prepared with various sand volume fractions to estimate the effect of the cementation in mixtures. The vertical deformation and elastic wave velocities with vertical stress are measured. The bender elements and PZT sensors are used to measure elastic wave velocities. After cementation, the slope of vertical strain shows bilinear and is similar to that of uncemented specimen after decementation. Normalized vertical strains can be divided into capillary force, cementation, and decementation region. The first deflection of the shear wave in near field matches the first arrival of the primary wave. The elastic wave velocities dramatically increase due to cementation hardening under the fixed vertical stress, and are almost identical with additional stress. After decementation, the elastic wave velocities increase with increase in the vertical stress. The effect of cementation hinders the typical rubber-like, sand-like, and transition behaviors observed in uncemented specimens. Different mechanism can be expected in decementation of the rigid-soft particle mixtures due to the sand fraction. a shape change of individual particles in low sand fraction specimens; a fabric change between particles in high sand fraction specimens. This study suggests that behaviors of cemented engineered soils, composed of rigid-soft particles, are distinguished due to the cementation and decementation from those of uncemented specimens.