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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 21, Issue 10 - Dec 2005
Volume 21, Issue 9 - Nov 2005
Volume 21, Issue 8 - Oct 2005
Volume 21, Issue 7 - Sep 2005
Volume 21, Issue 6 - Aug 2005
Volume 21, Issue 5 - Jul 2005
Volume 21, Issue 4 - Jun 2005
Volume 21, Issue 3 - Apr 2005
Volume 21, Issue 2 - Mar 2005
Volume 21, Issue 1 - Feb 2005
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Anisotropic Behavior of Compacted Decomposed Granite Soils
Ham Tae-Gew ; Hyodo Masayuki ; Ahn Tae-Bong ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 5~12
In order to investigate the strength and deformation anisotropy of compacted decomposed granite soils, a series of unsaturated-drained triaxial compression tests were performed. The sample used in the study was decomposed granite soil from Shimonoseki in Yamaguchi prefecture. The sample had three different angles of the axial (major principal) direction to the sedimentation plane (compaction plane), 0, 45 and 90 degrees. The compression strain of specimens subjected to isotropic compression was strongly influenced by the sedimentation angle. In addition, the time dependence was independent of the sedimentation angle in relation to the deformation behavior during the secondary compression process. The effect of the sedimentation angle on the triaxial compression strength and deformation was clear with low confining stress. Moreover, it was recognized that although the sedimentation angle and preparation methods were different, the dilatancy rate was relative to the increment of strength due to dilatancy. Therefore, it may be concluded that the compacted specimen has anisotropic mechanical properties similar to those of sand with initial fabric anisotropy.
Experimental Study on the Effect of Particle Size Distribution of Soil on the Liquefaction Resistance Strength
Seo Kyung-Bum ; Choi Mun-Gyu ; Kim Soo-Il ; Park Inn-Joon ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 13~20
For experimental study on the effect of particle size distribution on the liquefaction resistance strength, particle size distribution curves of the dredged soil were investigated. In this process, four mean particle sizes and three uniformity coefficients were defined representatively and twelve representative particle size distribution curves which have different mean particle size and uniformity coefficient, were defined and manufactured by using the real dredged river soil. Cyclic triaxial tests and resonant column tests were carried out to analyze the effect of mean particle size and uniformity coefficient on the liquefaction resistance strength and dynamic characteristics.
Behavior of a Geosynthetic Reinforced Two-tier Segmental Retaining Wall on a Yielding Foundation
Yoo Chung-Sik ; Jeon Han-Yong ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 21~29
This paper presents the results of a numerical investigation on the behavior of a geosynthetic reinforced two-tier segmental retaining wall (GR-SRW) on a yielding foundation. A hypothetical 10 m high two tier GR-SRW to be constructed on an incompetent foundation containing a layer of relative soft soil deposit was considered. A verified finite-element procedure was employed to get insights into the effect of foundation yielding on the wall behavior including the wall deformation and the reinforcement load. It is shown that the effect of foundation yielding is to increase the wall deformation as well as the reinforcement load, thus influencing both the internal as well as the external stability of the wall. Practical implications of the findings obtained from this study are highlighted in this paper.
Shear Strength and One-dimensional Compression Characteristics of Granitic Gneiss Rockfill Dam Material
Kim Bum-Joo ; Kim Yong-Seong ; Shin Dong-Hoon ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 31~42
In this study, a rockfill-dam material was investigated on its shear strength and compressibility by performing large-scaled triaxial and oedometer tests. The rockfill material was compacted at two different compaction levels and sheared in triaxial compression at three different confining stresses. Also, rockfill samples were prepared to have three different grain size distributions but the same dry density. Each sample with a given grain size distribution was then compressed one-dimensionally in a large-scaled oedometer cell with and without soaking. The rockfill samples exhibited slightly different shear behaviors with the varying compaction and confining stress levels. The increase in the compaction level changed the behavior from contractive to dilative. Dilation decreased gradually with increasing confining stress, resulting in reduction in the peak shear strength. The large-scaled oedometer test results showed that particle breakages increased with increasing average particle sizes of the samples. Comparing the samples with different gradations, a relatively well-graded sample exhibited lower compressibility. For saturated samples, slightly higher deformations were observed, compared to dry samples. The values of tangent constrained modulis for the dry samples were larger by about 10 to 20
, on the average, than those for the saturated samples.
Behaviour of Leaking Tunnels under Unconfined Flow Condition
Shin Jong-Ho ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 43~54
Tunnelling in a water bearing soil may cause draw-down of ground water table. Modelling of this problem requires considering the change of phreatic surface including the stress constitutive relationship for an unsaturated soil. However, it is normally assumed that ground water is confined. Numerical formulation of coupled behavior considering phreatic surface is described and implemented into computer program. Influence of unconfined flow on tunnel and ground is thoroughly investigated and compared with that of confined flow condition. It is identified that ground and lining behaviour below phreatic surface is almost the same as that under confined flow conditions, however, there is considerable difference in ground behaviour above phreatic surface. It is generally concluded that the assumption of confined flow is acceptable in terms of lining design.
Determination of CPT-based Bearing Capacity of Footings Under Surcharge Using State-dependent Finite Element Analysis
Lee Jun-Hwan ; Kim Dae-Ho ; Park Dong-Gyu ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 55~62
The use of the bearing capacity equation is subjected to several uncertainties. In this study, estimation of the bearing capacity of footings based on the cone resistance q
is investigated. Non-linear finite element analyses based on a state-dependent stress-strain model were performed to obtain the load-settlement responses of axially loaded circular footings. Various soil and footing conditions, including different relative densities, depths of embedment, and footing diameters were considered in the analyses. Based on the finite element results, load-settlement curves were obtained and used to determine the unit limit bearing capacity in terms of the cone resistance q
for footings subjected to surcharge. Values of the unit bearing capacity for different embedment depths were in a narrow range, while considerable variation was observed with relative density D
. It was observed that the unit limit bearing capacity normalized with respect to q
decreases as D
increases for a given surcharge.
A Case Study of Measuring Residual Groundwater Level on Reclaimed and Dredging Clay Layer
Yang Tae-Seon ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 63~72
Grounwater level applied on dredged and reclaimed clay layer was assumed to be the same value under design criterion as field test one, but actually differences are found through the monitoring test. In this study, a case study of measuring residual groundwater level is performed in ground improvement construction of Gwangyang container terminal and hinterland. With priority given to residual groundwater level measured during construction and management period of 9 years, it is investigated that residual groundwater level (R. GWL) could be applied reasonably to the design, construction, and use stages of the container harbor and land development.
Prediction of Layer Rutting on Pavement Foundations Based on Stress Dependency
Park Seong-Wan ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 73~80
There are several major practical consequences of stress-dependent properties of unbound pavement foundations. Among those are the stress-dependent modulus and Poisson's ratio's that may change, the compressive stresses that are generated in materials under load, the stiffening and strengthening effect of repeated loading to progressively increase the unbound pavement materials resistance to permanent deformation. In order to study these, the algorithm for predicting deformations on conventional flexible pavements are proposed and the stress-dependent effects on layer deformation are presented in this paper by the developed stress-dependent finite element analysis program with the selected models.
Dynamic Frictional Properties of Geosynthetic Interfaces Involving Only Non-geotextiles
Kim Jin-Man ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 81~89
Relationship between dynamic friction resistances and shear displacement rate, and other frictional characteristics of non-geotextile-involving geosynthetic interfaces was experimentally studied. A cyclic, displacement rate-controlled experimental setup built on a shaking table was used. The subsequent multiple rate tests showed that interfaces that do not involve geotextiles have distinct shearing characteristics that can be differentiated from the interfaces involving geotextiles. Unlike those of the geotextile-involving interfaces, shear behaviors of the interfaces involving only non-geotextiles tend to be not sensitive to shear displacement rate, and are approximately rigid-perfectly plastic.
Settlement Behavior Characteristics of CFRD in Construction Period - Case of Daegok Dam -
Park Han-Gyu ; Kim Yong-Seong ; Seo Min-Woo ; Lim Heui-Dae ;
Journal of the Korean Geotechnical Society, volume 21, issue 7, 2005, Pages 91~105
In this study, the deformation behavior of Daegok dam during the construction was analyzed based on the measurement data and a comparative analysis with foreign CFRD measurements was performed. From measuring settlements of Daegok dam with depth, overall behavior was evaluated to be consistent with measured data of other CFRD dams. In addition, construction modulus, void ratio and shape factor were also evaluated to be major factors in predicting the settlement behavior during construction of CFRD-typed dam from measured data of 38 CFRD-typed dams, and the maximum internal settlement is proportional to the void ratio. From the relationship between the maximum internal settlement and the height of a dam, 26 dams were assessed to have its relative modulus ranging between 0.001 and 0.01. In case of general CFRD, the average modulus of maximum internal settlement to the height of a dam is estimated to be 0.005. In case of a low void ratio, the construction modulus was high with its shape factor below 4. On the other hand, in case of a high void ratio, the relative settlement rate was high with its shape factor more than 4.