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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geosynthetic Society
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Journal DOI :
Korean GeoSynthetics Society
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Volume & Issues
Volume 14, Issue 4 - Dec 2015
Volume 14, Issue 3 - Sep 2015
Volume 14, Issue 2 - Jun 2015
Volume 14, Issue 1 - Mar 2015
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Development of Nonlinear Spring Modeling Technique of Group Suction Piles in Clay
Lee, Si-Hoon ; Lee, Ju-Hyung ; Tran, Xuan Nghiem ; Kim, Sung-Ryul ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 1~10
DOI : 10.12814/jkgss.2015.14.1.001
Recently, several researches on the development of new economical anchor systems have been performed to support floating structures. This study focused on the group suction piles, which connect mid-sized suction piles instead of a single suction pile with large-diameter. The group suction pile shows the complex bearing behavior with translation and rotation, so it is difficult to apply conventional design methods. Therefore, the numerical modeling technique was developed to evaluate the horizontal bearing capacity of the group suction piles in clay. The technique models suction piles as beam elements and soil reaction as non-linear springs. To analyze the applicability of the modeling, the horizontal load-movement curves of the proposed modeling were compared with those of three-dimensional finite element analyses. The comparison showed that the modeling underestimates the capacity and overestimate the displacement corresponding to the maximum capacity. Therefore, the correction factors for the horizontal soil resistance was proposed to match the bearing capacity from the three-dimensional finite element analyses.
Behaviour of Foundation Ground with Marine Clay in Anisotropy
Kim, Myeon-Su ; Lee, Kang-Il ; Kim, Chan-Ki ; Yun, Jung-Mann ; Baek, Won-Jin ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 11~21
DOI : 10.12814/jkgss.2015.14.1.011
This study aims at investigating of the behavioral characteristics of foundation ground subjected to a strip load in anisotropy. Using marine clays sampled at Shihwa area, a series of laboratory tests including triaxial compressive test, plane strain compressive and expansion tests that allows horizontal deformation only and zero strain (
) in the direction of intermediate stress (
) are conducted. In addition, a numerical analysis using parameters obtained from the tests is carried out. In the numerical analysis, Cam-clay model that simulates the behavior of natural deposited clay properly is adopted. The analysis results show that the vertical displacements of the plane strain compressive tests are relatively larger than those of triaxial compressive tests by 18-25%. Likewise, the horizontal displacements is 13-19% larger.
The Effects of pH on Microfluidics Flow Characteristics of Heavy Metals
Han, Jung-Geun ; Kim, Dong-Chan ; Hong, Kikwon ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 23~32
DOI : 10.12814/jkgss.2015.14.1.023
This paper describes a flow experiment and characteristics of heavy metals based on microfluidics, in order to improve the prefabricated vertical drain system that is possible pollutants removal and soil improvement in soft ground polluted with various pollutants, simultaneously. The result showed that the surface with hydrophobic condition affected large effect on flow velocity pollutants, and pH condition was also influence factor for change of flow velocity. Especially, the flow velocity of lead has risen slightly, when pH was close to basicity in complex heavy metal. This means that lead pollutant can reduce a hydrophobic characteristic in comparison with a copper pollutant.
Study on Engineering Characteristics of Mixed Material and Mix Ratio Design to Develope Pipe Mixing Method
Han, Sang-Jae ; Kim, Byung-Il ; Hong, Kang-Han ; Kang, Byung-Yoon ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 33~41
DOI : 10.12814/jkgss.2015.14.1.033
In this study, laboratory tests (flow, unit weight, unconfined compressive strength and bleeding tests) were performed to evaluate engineering properties of treated soil to improve pipe mixing method. As result, flow and bleeding properties are proportional to the water contents. The unit weight and unconfined compressive strength is decreased as the water contents increased. Comparing equipments contact pressure with bearing capacity of the mixed soil for dozer, backhoe and belt conveyor are immediately appliable. The applicable water content range is estimated from 80% to 200% by pipe mixing method using cement. Also, The design chart is developed from the results.
Behavior Characteristics of Underground Flexible Pipe Backfilled with Lightweight Foamed Soil
Lee, Yong-Jae ; Yea, Geu-Guwen ; Park, Sang-Won ; Kim, Hong-Yeon ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 43~50
DOI : 10.12814/jkgss.2015.14.1.043
Lightweight Foamed Soil (LWFS) is a useful material for underground pipe backfill because of reusability of excavated soil and no compaction effect. In this research, a pilot test is carried out and monitoring results are analyzed to investigate behaviors of a flexible pipe, when LWFS is applied as a backfill material. Simultaneously, they are compared with another test case which is backfilled with Saemangeum dredged soil. As a result, the vertical earth pressure of the case backfilled with LWFS slurry presents that decreases as much as 25.6% in comparison with dredged soil and it is only within 10% after solidification. In case backfilled with dredged soil, the horizontal earth pressure is more than 3.6 times of the case used by LWFS and the vertical and horizontal deformation is more than 3.2 and 2.6 times of the case, respectively. It presents excellent effects on earth pressure and deformation reduction of LWFS. The stresses measured at the upper side of the pipe generally present compressive aspects in case backfilled with dredged soil. However, they present tensile aspects in case of LWFS. It is because of negative moment occurred at the center of the pipe due to the buoyancy from LWFS slurry. Conclusively, LWFS using Saemangeum dredged soil is very excellent material to use near the area in comparison with the dredged soil. However, the countermeasure to prevent the buoyancy is required.
An Analytical Study for Determining Optimum Section and Trench Range on Soft Counter Weight Fill
Park, Jongcheol ; Chang, Yongchai ; Baek, Incheol ; Jung, Donghwan ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 51~58
DOI : 10.12814/jkgss.2015.14.1.051
The counter weight filling is a technology to accumulate soils on the side of berm with a proper width and height for improving the stability of the embankment. This study aims to assess a feasibility of the counter weight filling in the construction of pavement roads for recovery of shear failure during the construction. An effective counter weight filling section was suggested using the numerical analysis. The results showed that the effective counter weight filling section is two-fold (x2) higher than the ratio of width in counter weight filling : embankment height and one third (1/3) to the ratio of height in counter weight filling : embankment height. Also a range of effective trench crossing the counter weight filling required when a trench crossing counter weight filling is installed was suggested by supplying a proper distance between the counter weight filling section and cross-sectional trench.
A New Calibration Equation for Predicting Water Contents With TDR
Song, Minwoo ; Kim, Daehyeon ; Choi, Chanyong ;
Journal of the Korean Geosynthetic Society, volume 14, issue 1, 2015, Pages 59~65
DOI : 10.12814/jkgss.2015.14.1.059
The objective of the study is to verify a new calibration equation of dry density and water contents with TDR. Since the traditional calibration equation was proposed, some research to develop a new calibration equation has been conducted by several researchers. As traditional calibration equation is difficult to be applied for loose soil and fine-grained soil at high water contents, this study developed a new calibration equation. Thus, this study introduces a new calibration equation and its applicability by comparing TDR test results with conventional test results. Based on the analyses, the calibration equation for water content has large error. A new calibration equation was proposed and it showed more than 95% accuracy for estimating water content of soil.