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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geotechnical Society
Journal Basic Information
Journal DOI :
Korean Geotechical Society
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Volume & Issues
Volume 27, Issue 12 - Dec 2011
Volume 27, Issue 11 - Nov 2011
Volume 27, Issue 10 - Oct 2011
Volume 27, Issue 9 - Sep 2011
Volume 27, Issue 8 - Aug 2011
Volume 27, Issue 7 - Jul 2011
Volume 27, Issue 6 - Jun 2011
Volume 27, Issue 5 - May 2011
Volume 27, Issue 4 - Apr 2011
Volume 27, Issue 3 - Mar 2011
Volume 27, Issue 2 - Feb 2011
Volume 27, Issue 1 - Jan 2011
Selecting the target year
Hydraulic Conductivity and Strength Characteristics of Self Recovering Sustainable Liner (SRSL) as a Landfill Final Cover
Kwon, Oh-Jung ; Lee, Ju-Hyung ; Cho, Wan-Jei ; Jung, Young-Hoon ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 5~15
DOI : 10.7843/kgs.2011.27.12.005
Conventional designs of landfill covers use geosynthetics such as geomembrane and GCL, and clay liners to lower the permeability of final covers of landfill sites. However, differential settlement and the variation of temperature or humidity in landfill sites cause the development of cracks or structural damage inside the final cover. This study examined the application of a Self Recovering Sustainable Liner (SRSL) as an alternative landfill final cover material. SRSL consists of double layers, which have chemicals, can generate precipitates filling the pores of the layers by chemical reaction. The interface material forms an impermeable layer and in case of internal cracks, the reactants of the two layers migrate towards the crack and heal it by forming another liner. In this study the applicability of SRSL material for landfill final cover was examined by performing flexible wall permeameter tests to prove that the hydraulic conductivity is lower than the regulations and unconfined compression tests to judge whether the strength satisfies the restriction for the landfill final cover. Furthermore, the environmental impacts on the permeability and strength were evaluated. The experimental results show that the SRSL has lower hydraulic conductivity and higher strength than the regulations and is little influenced by climatic changes such as wet/dry or freeze/thaw process.
Shear Strength Characteristics of Geo - Soluble - Materials
Tran, M. Khoa ; Park, Jung-Hee ; Byun, Yong-Hoon ; Shin, Ho-Sung ; Lee, Jong-Sub ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 17~25
DOI : 10.7843/kgs.2011.27.12.017
A fabric of soil media may change due to certain factors such as dissolution of soluble particles, desiccation, and cementation. The fabric changes affect the mechanical behavior of soils. The purpose of this study is to investigate the effects of geo-material dissolution on shear strength. Experiments and numerical simulations are carried out by using a conventional direct shear and the discrete element method. The dissolution specimens are prepared with different volumetric salt fraction in sand soils. The dissolution of the specimens is implemented by saturating the salt-sand mixtures at different confining stresses in the experimental study or reducing the sizes of soluble particles in the numerical simulations. Experimental results show that the angle of shearing resistance decreases with the increase in the soluble particle content and the shearing behavior changes from dilative to contractive behavior. The numerical simulations exhibit that macro-behavior matches well with the experimental results. From the microscopic point of view, the particle dissolution produces a new fabric with the increase of local void, the reduction of contact number, the increase of shear contact forces, and the anisotropy of contact force chains compared with the initial fabric. The shearing behavior of the mixture after the particle dissolution is attributed to the above micro-behavior changes. This study demonstrates that the reduction of shearing resistance of geo-material dissolution should be considered during the design and construction of the foundation and earth-structures.
Behavior of Buried Geo-structures due to Increase of Excess Pore Water Pressure Ratio During Earthquakes
Kang, Gi-Chun ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 27~37
DOI : 10.7843/kgs.2011.27.12.027
Uplift phenomenon occurs when the apparent unit weight of buried geo-structures becomes smaller than that of the liquefied backfill due to the increase of an excess pore water pressure during strong earthquakes. In order to explain the relationship between the uplift displacement of the buried geo-structures and the increase of the excess pore water pressure ratio in backfill, dynamic centrifuge model tests are conducted. In the present study, primary and secondary factors against uplift behavior of the buried geo-structures are considered in the dynamic centrifuge model tests. Among these factors, the most important factors affecting the increase in the excess pore water pressure ratio were the ground water depth, the relative density of backfill, and the amplitude of the input acceleration, which were also largely affect the uplift amount of the buried geo-structures.
Stability Analysis for a Slope Reinforced with Pressure Grouted Soil Nails
Kim, Yong-Min ; Yun, Yeo-Hyeok ; Lee, Sung-June ; Jeong, Sang-Seom ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 39~52
DOI : 10.7843/kgs.2011.27.12.039
This paper describes a new numerical analysis technique in stability analysis for a slope reinforced with pressure grouted soil nails. The installing effect of pressure grouted soil nails can be simulated in this method. Shear strength reduction method associated with finite element method is used for slope stability analysis. Factors of safety for a slope reinforced with pressure grouted soil nails are compared with those for a natural slope and a slope reinforced with gravity grouted soil nails in order to investigate their reinforcing effects. More than 50% increase in the factor of safety is obtained when the slope is reinforced with pressure grouted soil nails compared to the one with gravity grouted soil nails. The reinforcing effects of pressure grouted soil nails become obvious with increase in their length. The reinforcing mechanism of the pressure grouted soil nails for the slope stability can be explained by the slope failure surface expanding gradually toward the backfill. The increased stability of the slope reinforced with pressure grouted soil nails results mainly from their improved pull-out resistance.
Basic Study for Development of NATM Composite Lining Method
Ma, Sang-Joon ; Kang, Eun-Gu ; Kim, Dong-Min ; Shin, Joo-Yul ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 53~68
DOI : 10.7843/kgs.2011.27.12.053
This paper presents the fundamental parameters for designing the NATM Composite Lining to be used in NATM tunnel construction. Firstly, the concept of NATM Composite Lining behaviour is introduced and reviewed in construction-performance. For the fundamental study, the optimal mix ratio tests and backfill material property tests to develop high-quality composite lining (PC panel lining) are fundamentally carried out. And the light-weight foamed mortar which is used for backfill material is developed. Full-scale loading tests to verify a performance of the NATM Composite Lining is also performed. From this research, it is clearly found that the NATM Composite Lining is very applicable method to considerably increase the stability and constructability of tunnel structure.
Study on Applicability of NATM Composite Lining Method
Ma, Sang-Joon ; Kang, Eun-Gu ; Kim, Dong-Min ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 69~84
DOI : 10.7843/kgs.2011.27.12.069
This paper presents the applicability of NATM Composite Lining method in domestic tunnel construction sites. Firstly, in order to produce high quality PC Panel, optimal steam curing condition is reviewed. And in preparation for fire inside the tunnel, the fire-resistance test of PC Panel is carried out. The constructability of NATM Composite Lining method and the drainage ability of light-weight foamed mortar is also evaluated through field construction test. And PC Panel combination program is developed to calculate the quantity of PC Panel efficiently. Besides, economic evaluation for NATM Composite Lining method is conducted. From this research, it is clearly found that NATM Composite Lining method is applicable to domestic tunnel construction site.
Settlement Behavior of Rubble Mound Breakwater and Its Surrounding Seabed due to Wave-Loads
Yun, Seong-Kyu ; Kim, Tae-Hyung ; Lee, Kyu-Hwan ; Lee, Kwang-Yeol ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 85~96
DOI : 10.7843/kgs.2011.27.12.085
A breakwater is a important structure for both calmness of harbor and protection of the port facilities from waves generated from typhoons or wind. This study adopted the rubble mound breakwater, which is one of the most popular type of breakwaters in Korea. Rubble mound breakwater had been designed by considering only static condition previously. Recently, a dynamic wave-load due to waves has been also considered in designing breakwater. In design, the wave-load is assumed as an uniform load which only acts in the front slope of the breakwater. However, the assumption is not applicable in reality. In this study, therefore, a real-time wave-load acting on the breakwater instead of the uniform load is considered, and it is assumed to be acting on the seabed too. Based on the numerical analysis, it is found that there is a significant difference in the maximum settlement compared with the result predicted by the existing design method.
Analysis of Pile Head Lateral Load-Deflection Behavior of Steel-Concrete Composite Drilled Shafts
Lee, Yong-An ; Chung, Moon-Kyung ; Park, Jae-Hyun ; Lee, Ju-Hyung ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 97~106
DOI : 10.7843/kgs.2011.27.12.097
To analyze the lateral load-deflection behavior of steel-concrete composite drilled shafts, a series of lateral pile load tests were performed. The test results were compared with the results from various analytical methods for lateral pile behaviors using the coefficients of subgrade reaction (
) estimated by pressuremeter test (PMT) and standard penetration test (SPT). As a result, it was found that the analytical methods using the
estimated by SPT N value were not suitable for evaluating the pile head lateral load-deflections of the piles within the allowable deflection. However, the methods using the
calculated from PMT were able to represent the initial lateral behavior at the head of the piles fairly well. Also, the method by the pressuremeter curve, which was applied directly to the p-y curve of the piles, offered a reasonable lateral behavior estimation by applying the correction factor to the pile materials.
A Comparative Study on Dynamic Behavior of Soil Containers that Have Different Side Boundary Conditions
Kim, Jin-Man ; Ryu, Jeong-Ho ; Son, Su-Won ; Na, Ho-Young ; Son, Jeong-Woong ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 107~116
DOI : 10.7843/kgs.2011.27.12.107
Rigid soil containers (or rigid boxes) are often used for 1g shaking table tests. The rigid boxes, however, do not accurately simulate the amplification of ground acceleration and phase difference of seismic motion in the model ground due to the confinement of shear deformation and the reflection of seismic wave at the box walls. Laminar soil containers (or laminar shear boxes) can simulate the free field motion at convincingly superior accuracy than the rigid ones. In this study, the soft ground is modeled for both types of boxes and is subjected to seismic loading using a 1g shaking table. The comparison of the results using the two types of soil containers illustrates that, in case of the rigid box, the ground acceleration shows non uniform distribution and the phase synchronization of input motion. Whereas, the dynamic behavior of the laminar shear box shows good agreement with the free field behaviors such as the amplification of ground acceleration and the occurrence of phase difference.
Analysis of Effective Stress Parameter on Partially Saturated Soil via Hydro-Mechanical Behaviors
Kim, Jae-Hong ; Kim, You-Seong ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 117~126
DOI : 10.7843/kgs.2011.27.12.117
Based on thermodynamics, the mathematical framework governing the hydro-mechanical behavior of partially saturated soil is derived by using balance equations, and the numerical analysis through implementation of various effective stress definitions is performed. Effective stress on partially saturated soil describes the soil strength which is presented by the relationship between water content and soil suction. For the estimation of hydro-mechanical behavior on partially saturated soil, effective stress parameter
defined from various literatures is especially analyzed to understand the conditions of constitutive equations regarding residual saturation and displacement of soil. As a result, effective stress parameter
has an influence on the variation of matric suction in soil with an external load and seepage. However it was found that the effect of each parameter
varies with residual degree of saturation, and that of each parameter
decreased with decrease in displacement of soil caused by an external load.
The Strength Characteristic of Shotcrete Reinforced with Improved Shape Steel Fiber
Kim, Sang-Hwan ; Park, Inn-Joon ; Kim, Ji-Tae ;
Journal of the Korean Geotechnical Society, volume 27, issue 12, 2011, Pages 127~136
DOI : 10.7843/kgs.2011.27.12.127
The laboratory tests were performed to investigate the strength characteristic of shotcrete reinforced with improved shape steel fiber developed in this study. Two different type of tests, the flexural toughness test and the bending strength test, were conducted for analyzing shotcrete strengths using three types of specimens (unreinforced shotcrete, exiting steel fiber reinforced shotcrete, and new concept steel fiber reinforced shotcrete). The results of tests represented the advancement of the strength characteristic of shotcrete reinforced with improved shape steel fiber with respect to that of shotcrete reinforced with existing steel fiber.