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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Geotechnical Society
Journal Basic Information
Journal DOI :
Korean Geotechical Society
Editor in Chief :
Seong Wan Park
Volume & Issues
Volume 29, Issue 12 - Dec 2013
Volume 29, Issue 11 - Nov 2013
Volume 29, Issue 10 - Oct 2013
Volume 29, Issue 9 - Sep 2013
Volume 29, Issue 8 - Aug 2013
Volume 29, Issue 7 - Jul 2013
Volume 29, Issue 6 - Jun 2013
Volume 29, Issue 5 - May 2013
Volume 29, Issue 4 - Apr 2013
Volume 29, Issue 3 - Mar 2013
Volume 29, Issue 2 - Feb 2013
Volume 29, Issue 1 - Jan 2013
Selecting the target year
A Study on the Ultimate End Bearing Capacity of Drilled Shafts in Rocks
Jeong, Sangseom ; Lee, Jaehwan ; Kim, Dohyun ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 5~15
DOI : 10.7843/kgs.2013.29.11.5
The end bearing capacity of rock-socketed drilled shafts under axial loading is investigated by Hoek-cell tests and a numerical analysis. From the test results, it was found that the ultimate end bearing capacity (
) was influenced by pile diameter, rock mass modulus and the spacing of discontinuity. A new ultimate end bearing capacity method is proposed by taking end bearing capacity influence factors, including rock mass discontinuity, based on field data. Through comparisons with other field data, the proposed
method represents a definite improvement in the prediction of ultimate end bearing capacity of rock-socketed drilled shafts.
An Experimental Verification on the Efficiency of Geosynthetics on Crushed Stone Layer
Park, Min-Cheol ; Im, Eun-Sang ; Kim, Jae-Hong ; Han, Heui-Soo ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 17~27
DOI : 10.7843/kgs.2013.29.11.17
This study is to prove the efficiency of geo-synthetics on the crushed stone layer by experiments. The strength of PET mat as reinforcing soft ground was verified through the loading experiments. Also, PP mat was used to protect the blockage of crushed stone layer by the filled soil, whose efficiency was examined according to loading and infiltration conditions. The crushed stones were penetrated into clay layer if the PET mat was removed, which was verified by loading experiments. In addition, the cohesioness of soil without PP mat made the blockage of stone layer easily, which reduced the infiltration capacity by about 98%.
Application of Soil-Cement Piles to the Ground Improvement of Harbor Structures
Lee, Seong-Hun ; Kwon, Oh-Yeob ; Shin, Jong-Ho ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 29~47
DOI : 10.7843/kgs.2013.29.11.29
This study undertook research on the sections of 90 harbor structures which applied a pile-type soil improvement using the soil-cement pile and then, determined the minimum replacement rate for each section, showing sufficient stability in all relevant studies including numerical analysis. The reliability of the numerical analysis was verified by a centrifuge model test. As a result of the study, it was revealed that when the foundation soil is too soft (
= under 15 kPa), it is unsuitable to apply a pile-type ground improvement to a soil improvement regardless of types of super structures. And a pile-type soil improvement was found to be suitable for a harbor structure with the relative stiffness ratio (n) of less than 50~75 at a maximum and the 2~3 MPa strength of the soil-cement pile. Furthermore the governing factor for the minimum replacement rate for the pile-type soil improvement was turned out to be the allowable horizontal displacement. Therefore, the primary review to see the applicability of the pile-type soil improvement requires the evaluation of horizontal displacements.
Geotechnical Considerations for Railway Design in the Middle East
Moon, Joon-Shik ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 49~60
DOI : 10.7843/kgs.2013.29.11.49
The plan for major design-build projects of railway link among countries in gulf area (GCC) and freight rail construction is recently announced, but Korean companies have a hard time tendering due to special geotechnical condition in the Middle East. The major geotechnical risks during railway construction in the Middle East are related to ground improvement of soft Sabkha ground, wind-blown sand mitigation measure, dune sand compaction, and construction of large-scale cut and embankment. In this study, the characteristics of special geotechnical condition and potential geotechnical risks during railway construction in the Middle East are discussed on the basis of field observation, literature review, and field and laboratory test results.
Secondary Compression Characteristics Caused by Particles Crushing of Sabkha Soil
Kim, Seok-Ju ; Bae, Kyung-Tae ; Yi, Chang-Tok ; Han, Heui-Soo ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 61~72
DOI : 10.7843/kgs.2013.29.11.61
The consolidation tests are conducted to investigate the soil particle crushing stress for understanding the secondary compression characteristics of carbonate sandy sabkha soil caused by particle crushing under a high confining stress. The rate of secondary crushing compression (
) is introduced instead of the rate of secondary compression to define the characteristic of the particle crushing compression settlement (
). Void ratio (
) and settlement (
) in particle crushing are used as a reference point of secondary behavior, and the ratio of primary compression index (
) to secondary crushing compression (
value was changed from 0.0105 to 0.0187. When comparing with quartz sands, secondary compression settlement of sabkha is very large due to particle crushing which is not usually observed in quartz sand. It is observed that as the depth of sabkha layer becomes deep, the
increase under the same stress level.
A Proposal of Flow Limit for Soils at Zero Undrained Shear Strength
Park, Sung-Sik ; Nong, Zhenzhen ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 73~84
DOI : 10.7843/kgs.2013.29.11.73
When a slope failure or a debris flow occurs, a shear strength on failure plane becomes nearly zero and soil begins to flow like a non-cohesive liquid. A consistency of cohesive soils changes as a water content increases. Even a cohesive soil existing at liquid limit state has a small amount of shear strength. In this study, a water content, at which a shear strength of cohesive soils is zero and then cohesive soils will start to flow, was proposed. Three types of clays (kaolinite, bentonite and kaolinite (50%)+bentonite (50%)) were mixed with three different solutions (distilled water, sea water and microbial solution) at liquid limit state and then their water contents were increased step by step. Then, their undrained shear strength was measured using a portable vane shear device called Torvane. The ranges of undrained shear strength at liquid and plastic limits are 3.6-9.2 kPa and 24-45 kPa, respectively. On the other hand, the water content that corresponds to the value of the undrained shear strength changing most rapidly is called flow water content. The flow limit refers to the water content when undrained shear strength of cohesive soils is zero. In order to investigate the relationship between liquid limit and flow limit, the cohesive index was defined as a value of the difference between flow limit and liquid limit. The new plasticity index was defined as the value of difference between flow limit and plastic limit. The new liquidity index was also defined using flow limit. The values of flow limit are 1.5-2 times higher than those of liquid limit. At the same time, the values of new plasticity index are 2-5.5 times higher than those of original plasticity index.
Numerical Analyses on Moment Resisting Behaviors of Electric Pole Foundations According to Their Shapes
Lee, Su-Hyung ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 85~97
DOI : 10.7843/kgs.2013.29.11.85
Electric pole foundations for overhead catenary system of railroad should be designed so that they may resist significant overturning moment but relatively small vertical forces. Also they should have proper shapes to be installed at restricted narrow areas adjacent to railroad track. In this paper the moment responses of rectangular pole foundations according to their shapes were investigated numerically. A three-dimensional finite element method was developed and verified so that the numerical behaviors of the foundation resisting the overturning moments were compared reasonably well with those from an existing real-scale load test. The influences of aspect ratio, varying section with depth and loading directions for rectangular section were investigated using the developed numerical method. From the numerical results, the optimized shapes of pole foundation for more effective and economic installation adjacent to railroad track are proposed.
Risk Assesment for Large-scale Slopes Using Multiple Regression Analysis
Lee, Jong-Gun ; Chang, Buhm-Soo ; Kim, Yong-Soo ; Suk, Jae-Wook ; Moon, Joon-Shik ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 99~106
DOI : 10.7843/kgs.2013.29.11.99
In this study, the correlation of evaluation items and safety rating for 104 of large-scale slopes along the general national road was analyzed. And, we proposed the regression model to predict the safety rating using the multiple regressions analysis. As the result, it is shown that the evaluation items of slope angle, rainfall and groundwater have a low correlation with safety rating. Also, the regression model suggested by multiple regression analysis shows high predictive value, and it would be possible to apply if the evaluation items of excavation condition and groundwater (rainfall) are not clear.
A Case Study on the Restoration of Collapsed Geosynthetics Reinforced Soil Wall Using Limit Equilibrium and Numerical Analyses
Won, Myoung-Soo ; Kim, Hyeong-Joo ; Kim, Young-Shin ; Choi, Jeong-Ho ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 107~118
DOI : 10.7843/kgs.2013.29.11.107
Geosynthetic reinforced soil (GRS) walls have been increasingly applied recently due to its numerous geotechnical engineering applications. However failure occurs in some cases of constructed GRS walls. These GRS wall failures are mostly due to the unpredictable characteristics of intensive rainfall. Hence, the need for new and innovative ideas for rehabilitation methods has been getting attention. This paper introduces a case study for the design and restoration method of collapsed GRS wall using Limit equilibrium and Numerical Analyses. Restoration method includes: (1) soil nailing without backfill excavation and (2) reconstruction with GRS wall after collapsed backfill excavation. Analyses results show minimal horizontal displacements and shear strain on the reinforced concrete facing for the restoration case with soil nailing. On the other hand, horizontal displacements are developed in the middle of the mortar block facing and shear strains are developed at the bottom facing with spiral curves for the reconstructed GRS wall after collapsed backfill excavation. Therefore, the collapsed GRS wall was restored with the soil nailing without backfill excavation and its construction procedures are discussed in this paper.
Horizontal Bearing Behavior of Group Suction Piles by Numerical Analysis
Lee, Ju-Hyung ; Lee, Si-Hoon ; Kim, Sung-Ryul ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 119~127
DOI : 10.7843/kgs.2013.29.11.119
Recently, several researches on the development of new economical foundation types have been performed to support floating structures as many offshore structures have been constructed. This study focused on the evaluation of bearing capacity of group suction piles, which are connected by a concrete pile cap. The offshore floating structures are mainly subjected to horizontal loading, so the horizontal bearing capacities of the group suction piles were analyzed by performing 3-dimensional finite element analyses. The group suction piles are expected to behave as a rigid pile due to its shallow embedded depth. Therefore, the detailed soil modeling was necessary to simulate the bearing behavior of soils under low confining pressure. The modulus and the strength of soils were modelled to increase with effective confining pressure in soils. For the parametric study, the center-to-center spacing between piles was varied and two soil types of clay and sands were applied. The analyses results showed that the yielding load of the group pile increased with the increase of the pile spacing and the yielding load of the group piles with 5D spacing was about 3 times larger than that of the single pile with free rotation.
A Study On Structural Behavior of Anchor Pile Precast Retaining Wall with Screw Shape Flange
Choi, Seung-Seon ; Ahn, Tae-Bong ; Kim, Woo-Ki ;
Journal of the Korean Geotechnical Society, volume 29, issue 11, 2013, Pages 129~138
DOI : 10.7843/kgs.2013.29.11.129
In this study, Anchor Pile Precast Retaining Wall (APC) with screw shape flange was investigated and the results were arranged for designing APC specifications. Since precast materials require special care when they are manufactured, carried or treated, more accurate design and analysis of optimized dimension are needed : thus moment distribution of front foot was checked. Through full-scale field test, form and optimal stiffening shape were obtained and through fracture test with real load, applicable load was reasonably calculated. Research result in this thesis could be used as guideline or standard of designing and constructing Anchor Pile Precast Retaining Wall with screw shape flange.