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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
Editor in Chief :
Seong Wan Park
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
Analysis Method for Non-Linear Finite Strain Consolidation for Soft Dredged Soil Deposit - Part II: Analysis Method and Craney Island Case Study
Choi, Hang-Seok ; Kwak, Tae-Hoon ; Lee, Chul-Ho ; Lee, Dong-Seop ; Stark, T.D. ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 5~15
DOI : 10.7843/kgs.2011.27.11.005
This paper presents two analysis methods for characterizing the non-linear finite strain consolidation behavior of highly deformable dredged soil deposits along with the fundamental parameters obtained in the companion paper; that is, the zero effective stress void ratio, the non-linear relationships of void ratio-effective stress and void ratio-hydraulic conductivity. The simplified Morris's analytical solution (2002) and the widely recognized numerical program, PSDDF (primary Consolidation, Secondary Compression, and Desiccation of Dredged Fill) for both single and double drainage conditions are adopted in this paper to verify a series of laboratory experiments for self-weight consolidation of the Incheon clay and Kaolinite. The comparisons show that the analysis methods proposed herein can properly simulate the long-term non-linear finite strain consolidation behavior for dredged soils in the field. In addition, a case study for the artificial Craney Island has been conducted to illustrate the importance of obtaining appropriate non-linear finite strain consolidation parameters and the applicability of PSDDF in promoting dredged soil disposal.
Characteristic of Bearing Capacity of Shallow Foundation upon Clay Ground Replaced by Sands Depending on Bearing Capacity Ratio
Ha, Young-Min ; Jung, Min-Hyung ; Sin, Hyo-Hee ; Lee, Song ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 17~25
DOI : 10.7843/kgs.2011.27.11.017
In this study, we considered the bearing capacity of strip footing over clay layers partially replaced by sand. The FEM analysis is performed to calculate the ultimate bearing capacity. Partial replacement is defined by multiples of footing width(B) and inclination of sides. The cases(B'=inf.) of sand layers equal to clay layers are preferentially conducted. The baring capacity of B'=inf. is comparative value for bearing capacity of partial replacement layers.
is the ratio of ultimate bearing capacity of B'=inf and partial ultimate bearing capacity replacement.
is used to analyze the characteristic of bearing capacity of clay layers partially replaced by sand. Each of the three undrained shear strengths of clay and friction angles of sand is considered. The result of this analysis shows that
depends on sand depth.
Analysis of Load Capacity and Deformation Behavior of Suction Pile Installed in Sand
Kim, You-Seok ; Jang, Yeon-Soo ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 27~37
DOI : 10.7843/kgs.2011.27.11.027
A series of centrifuge model tests to investigate the suction pile pullout loading capacity in sand have been performed. The main parameters that affect the pullout loading capacity of a suction pile include the mooring line inclination angle and the padeye position of the suction pile. With respect to the padeye position, the maximum pullout loading capacity is obtained when the padeye position is near 75% of the pile length from the top. The direction of the pile rotation changes when the padeye position reaches somewhere near 50~75% for all mooring line inclination angles. The translation displacement of suction pile to develop the time of maximum pullout loading capacity decreased as the mooring line inclination angle increased. In addition, the vertical displacements of the center of a suction piles for all cases appeared to develop toward the ground surface.
Characterization of Thermal Properties for Glass Beads - Rubber Mixture
Lee, Jung-Hwoon ; Yun, Tae-Sup ; Evans, T. Matthew ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 39~45
DOI : 10.7843/kgs.2011.27.11.039
This study presents the thermal behaviors of glass beads-rubber mixtures depending on the volumetric fraction of each constituent and relative size between them. The transient plane source method is used to measure the effective thermal conductivity of mixtures. The discrete element method (DEM) and the thermal network model are integrated to investigate the particle-scale mechanism of heat transfer in granular packings. Results show that 1) the effective thermal conductivity decreases as the rubber fraction increases, and 2) the relative size between two solid particles dominates the spatial configuration of inter-particle contact condition that in tum determines the majority of heat propagation path through particle contacts. For the mixtures whose volumetric fraction of rubber is identical, the less conductive materials (e.g., rubber particles) with a large size facilitate heat transfer in granular materials. The experimental results and particle-scale observation highlight that the thermal conduction behavior is dominated not only by the volumetric fraction but also the spatial configuration of each constituent.
Longitudinal Deformation Characteristics during Excavation of a old Tunnel in Operation
Baek, Ki-Hyun ; Kim, Woong-Ku ; Seo, Kyoung-Won ; You, Dong-Woo ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 47~54
DOI : 10.7843/kgs.2011.27.11.047
In this paper, longitudinal behaviors of a tunnel with respect to various conditions are analyzed, and a new equation of longitudinal deformation curve during tunnel expansion is proposed. Finally, the range of protection by a protector is investigated using the proposed equation. To achieve the objectives, numerical analysis according to the ground and expansion conditions is performed. The results show that the range of protection, when a 2 traffic lane tunnel is expanded to 4 traffic lanes, should cover at least 24m to backward and 35m forward.
Constitutive Model for Unsaturated Soils Based on the Effective Stress
Shin, Ho-Sung ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 55~69
DOI : 10.7843/kgs.2011.27.11.055
The importance of unsaturated state in various geo-engineering problems has led to the advance of mechanical constitutive model emulating behavior of unsaturated soils in response to thermo-hydro-mechanical loading. Elasto-plastic mechanical constitutive model for unsaturated soil is formulated based on Bishop's effective stress. Effective stress and temperature are main variables in constitutive equation, and incremental formulation of constitutive relationship is derived to compute stress update and stiffness tensor. Numerical simulations involving coupled THM processes are conducted to discuss numerical stability and applicability of developed constitutive model: one-dimensional test, tri-axial compression test, and clay-buffering at high level radioactive waste disposal. Numerical results demonstrated that developed model can predict very complex behavior of coupled THM phenomena and is applicable to geo-engineering problems under various environmental conditions, as well as interpret typical behavior of unsaturated soils.
Prediction of Adfreeze Bond Strength Using Artificial Neural Network
Ko, Sung-Gyu ; Shin, Hyu-Soung ; Choi, Chang-Ho ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 71~81
DOI : 10.7843/kgs.2011.27.11.071
Adfreeze bond strength is a primary design parameter, which determines bearing capacity of pile foundation in frozen ground. It is reported that adfreeze bond strength is influenced by various affecting factors like freezing temperature, confining pressure, characteristics of pile surface, soil type, etc. However, several limited researches have been performed to obtain adfreeze bond strength, for past studies considered only few affecting factors such as freezing temperature and type of pile structures. Therefore, there exists a limitation of estimating the design parameter of pile foundation with various factors in frozen ground. In this study, artificial neural network algorithm was involved to predict adfreeze bond strength with various affecting factors. From past five studies, 137 data for various experimental conditions were collected. It was divided by 100 training data and 37 testing data in random manner. Based on the analysis result, it was found that it is necessary to consider various affecting factors for the prediction of adfreeze bond strength and the prediction with artificial neural network algorithm provides enough reliability. In addition, the result of parametric study showed that temperature and pile type are primary affecting factors for adfreeze bond strength. And it was also shown that vertical stress influences only certain temperature zone, and various soil types and loading speeds might cause the change of evolution trend for adfreeze bond strength.
Quantification of 3D Pore Structure in Glass Bead Using Micro X-ray CT
Jung, Yeon-Jong ; Yun, Tae-Sup ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 83~92
DOI : 10.7843/kgs.2011.27.11.083
The random and heterogeneous pore structure is a significant factor that dominates physical and mechanical behaviors of soils such as fluid flow and geomechanical responses driven by loading. The characterization method using non-destructive testing such as micro X-ray CT technique which has a high resolution with micrometer unit allows to observe internal structure of soils. However, the application has been limited to qualitatively observe 2D and 3D CT images and to obtain the void ratio at macro-scale although the CT images contain enormous information of materials of interests. In this study, we constructed the 3D particle and pore structures based on sequentially taken 2D images of glass beads and quantitatively defined complex pore structure with void cell and void channel. This approach was enabled by implementing image processing techniques that include coordinate transformation, binarization, Delaunay Triangulation, and Euclidean Distance Transform. It was confirmed that the suggested algorithm allows to quantitatively evaluate the distribution of void cells and their connectivity of heterogeneous pore structures for glass beads.
Image Calibration Techniques for Removing Cupping and Ring Artifacts in X-ray Micro-CT Images
Jung, Yeon-Jong ; Yun, Tae-Sup ; Kim, Kwang-Yeom ; Choo, Jin-Hyun ;
Journal of the Korean Geotechnical Society, volume 27, issue 11, 2011, Pages 93~101
DOI : 10.7843/kgs.2011.27.11.093
High quality X-ray computed microtomography (micro-CT) imaging of internal microstructures and pore space in geomaterials is often hampered by some inherent noises embedded in the images. In this paper, we introduce image calibration techniques for removing the most common noises in X-ray micro-CT, cupping (brightness difference between the periphery and central regions) and ring artifacts (consecutive concentric circles emanating from the origin). The artifacts removal sequentially applies coordinate transformation, normalization, and low-pass filtering in 2D Fourier spectrum to raw CT-images. The applicability and performance of the techniques are showcased by describing extraction of 3D pore structures from micro-CT images of porous basalt using artifacts reductions, binarization, and volume stacking. Comparisions between calibrated and raw images indicate that the artifacts removal allows us to avoid the overestimation of porosity of imaged materials, and proper calibration of the artifacts plays a crucial role in using X-ray CT for geomaterials.