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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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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
A Study on Alternative Backfill Material for Pre-insulated Pipe through the Laboratory Tests
Choi, Bong-Hyuck ; Kim, Jin-Man ; Yoo, Han-Kyu ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 5~11
DOI : 10.7843/kgs.2011.27.9.005
This paper recommends the alternative back-fill material for the pre-insulated pipe based on the results of tests performed using different kinds of backfill material. In this study, laboratory tests were preformed to determine the behavior of the pre-insulated pipe caused by variation on grain size distribution, friction characteristics and earth pressure characteristics of different types of backfill material. Two types of natural sand (fine-grained and coarse-grained sand) and crushed sand, and two types of gravel (10mm, 20mm) were used as backfill material in the laboratory tests. The laboratory test results were analyzed and compared with the pre-insulated pipe backfilled with the standard medium-grained sand. Based on the evaluation and comparison of laboratory test results, it was determined that crushed sand is the most suitable back-fill material that can be used as an alternative for medium grained sand for pre-insulated pipes.
Analysis Method for Non-Linear Finite Strain Consolidation for Soft Dredged Soil Deposit -Part I: Parameter Estimation for Analysis
Kwak, Tae-Hoon ; Lee, Chul-Ho ; Lim, Jee-Hee ; An, Yong-Hoon ; Choi, Hang-Seok ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 13~24
DOI : 10.7843/kgs.2011.27.9.013
The renowned Terzaghi`s one-dimensional consolidation theory is not applicable to quantification of time-rate settlement for highly deformable soft clays such as dredged soil deposits. To deal with this special condition, a non-linear finite strain consolidation theory should be adopted to predict the settlement of dredged soil deposits including self-weight and surcharge-induced consolidation. It is of importance to determine the zero effective stress void ratio (
), which is the void ratio at effective stress equal to zero, and the relationships of void ratio-effective stress and of void ratio-hydraulic conductivity for characterizing non-linear finite strain consolidation behavior for deformable dredged soil deposits. The zero effective stress void ratio means a transitional status from sedimentation to self-weight consolidation of dredged soils. In this paper, laboratory procedures and equipments are introduced to measure such key parameters in the non-linear finite strain consolidation analysis. In addition, the non-linear finite strain consolidation parameters of the Incheon clay and kaolinite are evaluated with the aid of the proposed methods in this paper, which will be used as input parameters for the non-linear finite strain consolidation analyses being performed in the companion paper.
Behavior of Dry-stone Segmental Retaining Wall Using Physical Modeling and Numerical Simulation
Kim, Seong-Su ; Mok, Young-Jin ; Jung, Young-Hoon ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 25~36
DOI : 10.7843/kgs.2011.27.9.025
The behavior of the dry-stone masonry retaining structure has been investigated via physical model test and numerical simulation. In the model test, the digital image analysis using PIV technique was employed to measure horizontal displacements in the backfill soils and retaining blocks. For finite element numerical analyses, the commercial code, ABAQUS, was used. The horizontal displacements observed in the model test showed that the development of the failure surface is progressive. Numerical results showed that in most cases horizontal earth pressure is distributed similarly to a conventional Rankine’s distribution. However, lower values of the internal friction angle of the backfill soils and interface friction angle in the front blocks produce irregularly nonlinear distribution of the horizontal earth pressure.
Prediction of Compression Index of Busan and Inchon Clays Considering Sedimentation State
Hong, Sung-Jin ; Kim, Dong-Hee ; Choi, Young-Min ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 37~46
DOI : 10.7843/kgs.2011.27.9.037
The compression index, which represents the compressibility of clay, is generally obtained from the consolidation test, or has been predicted by empirical correlations with soil properties. In this study, the results of consolidation tests on natural and reconstituted Busan and Inchon clays are analyzed to figure out the sedimentation state and its effect on empirical correlations. Results of analysis show that the void index of Busan clay is higher than SCL while the void index of Inchon clay is lower than SCL. By comparing prediction errors with
, which represents the sedimentation state of clay, it is shown that errors predicting the compressibility based on the liquid limit and plasticity index decrease as
increases. Supplemented correlations predicting the compression index of Busan and Inchon clays are suggested using these relationships.
Effect of Salinity on Mechanical Characteristics of Stabilized Dredged Soil
Kim, Yun-Tae ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 47~53
DOI : 10.7843/kgs.2011.27.9.047
Marine dredged soils taken from navigation channels or construction sites of coastal area usually have a lot of salt in pores of clayey soils. This paper investigates effect of salt on mechanical characteristics of non-salt and salt-rich stabilized dredged soil. The stabilized dredged soil (SDS) consisted of dredged soil and cement. Several pairs of SDS with non-salt and salt-rich dredged soils, noted as N-SDS and S-SDS, respectively, were prepared to compare their strengths and compressibility characteristics. The microstructures, strength and compressibility characteristics of N-SDS and S-SDS specimens at 7 and 28 days of curing time were evaluated using scanning electronic microscope (SEM), unconfined compression test, and oedometer test. It was found that salt concentration of clayey soil affected not only the formation of soil structure but also the strength development of mixture. The compression index and swelling index of S-SDS were also greater than those of N-SDS, which indicated that the compressibility of mixture increased due to salt concentration. Salinity in clayey soil had a negative effect on the strength development and compressibility characteristics of stabilized dredged soils.
Prediction Equation of Compulsory Replacement Depth of Silty Layer in Sihwa Region
Park, Young ; Lim, Heui-Dae ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 55~66
DOI : 10.7843/kgs.2011.27.9.055
The compulsory replacement method for soft ground treatment is simple but excellent in economic feasibility. However, the accurate replacement depth is not easy to properly predicted since an theoretical algorithm has not presently been established so far. In this research a prediction equation is proposed in a new form based on the liquid limit and natural moisture content rather than on the bearing capacity of the soft soil layer. The equation is based on the monitoring as well as the confirmatory boring at the site. In addition, the equation has been derived from the data obtained from the analysis of the characteristics of silt/clay of Sihwa region. The final prediction equation has been drawn by applying the regression analysis method.
Experimental Study on Adfreeze Bond Strength Between Frozen Sand and Aluminium with Varying Freezing Temperature and Vertical Confining Pressure
Ko, Sung-Gyu ; Choi, Chang-Ho ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 67~76
DOI : 10.7843/kgs.2011.27.9.067
Bearing capacity of pile foundations in cold region is dominated by adfreeze bond strength between surrounding soil and pile perimeter. Adfreeze bond strength is considered to be the most important design parameter for foundations in cold region. Many studies in last 50 years have been conducted to analyze characteristics of adfreeze bond strength. However, most studies have been performed under constant temperature and normal stress conditions in order to analyze affecting factors like soil type, pile material, loading speed, etc. In this study, both freezing temperature and normal stress acting on pile surface were considered to be primary factors affecting adfreeze bond strength, while other factors such as soil type, pile material and loading speed were predefined. Direct shear box was used to measure adfreeze bond strength between Joomoonjin sand and aluminium because it is easy to work for various roughness. Test was performed with temperatures of >
and vertical confining pressures of 1atm, 2atm, and 3atm. Based on the test results, the effects of temperature and vertical stress on adfreeze bond strength were analyzed. The test results showed that adfreeze bond strength increases with decreased temperature and increased vertical stress. It was also noted that two types of distinct sections exist, owing to the rate of increase of adfreeze bond strength along the change of freezing temperature: 1)rapidly increasing section and 2)gradually decreasing section. In addition, the results showed that a main factor affecting adfreeze bond strength switches from friction angle to adhesion as freezing temperature decreases.
Loading Effects on Thermal Conductivity of Soils: Particle-Scale Study
Lee, Jung-Hwoon ; Choo, Jin-Hyun ; Yun, Tae-Sup ; Lee, Jang-Guen ; Kim, Young-Seok ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 77~86
DOI : 10.7843/kgs.2011.27.9.077
The stress condition mainly dominates the thermal conductivity of soils whereas governing factors such as unit weight and porosity suggested by empirical correlations are still valid. The 3D thermal network model enables evaluation of the stress-dependent thermal conductivity of particulate materials generated by discrete element method (DEM). The relationship among dominant factors is analyzed based on the coordination number and porosity determined by stress condition and thermal conductivity of pore fluid. Results show that the variation of thermal conductivity is strongly attributed to the enlargement of inter-particle contact area by loading history and pore fluid conductivity. This study highlights that the anisotropic evolution of thermal conductivity depends on the directional load and that the particle-scale mechanism mainly dictates the heat transfer in soils.
Analysis of Dynamic Earth Pressure on Piles in Liquefiable Soils by 1g Shaking Table Tests
Han, Jin-Tae ; Choi, Jung-In ; Kim, Sung-Hwan ; Yoo, Min-Taek ; Kim, Myoung-Mo ;
Journal of the Korean Geotechnical Society, volume 27, issue 9, 2011, Pages 87~98
DOI : 10.7843/kgs.2011.27.9.087
In this study, the magnitude and phase variation of dynamic earth pressure acting on a pile in liquefiable soils were analyzed using a series of 1g shaking table tests. In the case of a pile in dry sand, the value of the dynamic earth pressure was the highest near the surface due to the inertia force of the upper load on the pile and it decreased as the depth of the pile got lower. On the other hand, for a pile in liquefiable sand, the magnitude and shape of the dynamic earth pressure were similar to those of the excess pore pressure and was largely affected by the deformation of soils. Furthermore, the inertia force of the upper load and the dynamic earth pressure acted in opposite directions in cases of dry sand and saturated sand where low excess pore pressure had developed. However, after liquefaction, those force components near surface acted unfavorably in the same direction. Finally, the Westergaard’s solution was modified and proposed as a method to evaluate the magnitude of dynamic earth pressure acting on a pile during liquefaction.