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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 15, Issue 2 - Jun 2016
Volume 15, Issue 1 - Mar 2016
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Analysis of Lateral Behavior of Steel Pile embedded in Basalt
Kim, Khi-Woong ; Park, Jeong-Jun ; Kim, Jin-Woo ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 1~10
DOI : 10.12814/jkgss.2016.15.1.001
Recently, offshore wind farms are increasingly expected, because there are huge resource and large site in offshore. Jeju island has optimum condition for constructing a wind energy farm. Unlike the mainland, Jeju island has stratified structure distribution between rock layers sediments due to volcanic activation. In these case, it can be occur engineering problems in whole structures as well as the safety of foundation as the thickness and distribution of sediment under top rock layer can not support sufficiently the structure. In this study, field lateral load test of the pile for analyzing lateral behavior of the offshore wind turbine which is embedded in basalt. After calculating the subgrade resistance and the horizontal deflection from the measured strain to derive p-y curve from the lateral load test results, the subgrade resistance amplifies the error in the process of differentiation and the error of piecewise polynomial curve fitting is the smallest. In order to calculate the horizontal deflection from the measured strain, the six-order polynomial was used.
Behavior of Geosynthetic Reinforced Wall with Heat Induce Drainage Method During Rainfall
Shin, Seung-min ; Sin, Chun-won ; Yoo, Chung-Sik ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 11~19
DOI : 10.12814/jkgss.2016.15.1.011
This paper presents the results of a scale model test to the effect of heat exchanger drainage method in retaining wall of weathered granite soil. Purpose to rise in the temperature of the heat wires inside the weathered granite soil is preventing the collapse of the retaining wall and drainage smoothly moved to the drainage layer. Especially using a spray gun to simulate the rainfall since the rainfall drainage work is important for the rainfall effect on soil, find the difference about displacement of the retaining wall, change of volume water content, drainage, earth pressure and change in the strain of the geosynthetic was effected to heat exchanger within the soil. The result from applying the heat exchanger method decreased the earth pressure and displacement of the wall and increased drainage of water.
A Study on the Pile Material Suited for Pile Supported Embankment Reinforced by Geosynthetics
Choi, Choong-Lak ; Lee, Kwang-Wu ; Kim, Eun-Ho ; Jung, Ji-Won ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 21~35
DOI : 10.12814/jkgss.2016.15.1.021
It is a current trend that the concrete track is applied for high speed railway. In the case of the railway embankment constructed on soft ground, the damage to concrete track which is sensitive to settlement such as distortion and deflection could be caused by very small amount of long term settlement. Pile Supported Embankment method can be considered as the effective method to control the residual settlement of the railway embankment on soft ground. The Geosynthetics is used inside of the embankment to maximize the arching effect transmitting the load of the embankment to the top of the piles. But, PHC piles that are generally used for bridge structures are also applied as the pile supporting the load of embankment concentrated by the effect of the Geosynthetics. That is very low efficiency in respect of pile material. So, in this study, the cast in place concrete pile was selected as the most suitable pile type for supporting the embankment by a case study and the optimum mixing condition of concrete using a by-product of industry was induced by performing the mixing designs and the compressive strength designs. And it is shown that the cast in place pile with the optimum mixing condition using the by-product of industry is 2.8 times more efficient than the PHC pile for the purpose of Pile Supported Embankment by the finite element analysis method.
Bearing Capacity Study for Small-Scale Testing of Rotary Pile with Helix Plate
Shin, Eun-Chul ; Kim, Kyeong-Sig ; Moon, Hyeong-Rok ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 37~46
DOI : 10.12814/jkgss.2016.15.1.037
Rotary pile consists a single or multiple helix plate and it is installed into the ground using the rotation of the helix plate. Rotary pile in soft ground is able to be supported by pile shaft and helix plate. When the pile is installed into hard layer relatively, the end bearing capacity is possible to be increased by the lower helix plate. In this paper, small-size rotary piles were manufactured with using steel pipe which is reduced to 1/5 size of the rotary pile on the construction field. Pile load test was carried out on the foundation soil which was formed by weathered soft soil. The bearing capacity of small-scale piles depends on the number of helix plate, the length of plate diameter, and an interval of plates, respectively. The bearing capacity of pile increases about 40% with 3 helix plate and it is also confirmed that the bearing capacity is improved about 10% as the increment of plate interval.
A Study of Consolidation Behavior of Clay Ground with Partially Penetrated PVD under Artesian Pressure
Yun, Daeho ; Nguyen, Ba Phu ; Kim, Jaehong ; Kim, Yuntae ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 47~57
DOI : 10.12814/jkgss.2016.15.1.047
Many researchers reported that artesian pressure exists in thick soft ground of Busan Nakdong river estuary. Artesian pressure in soft ground could affect rate of consolidation, settlement and drainage capasity of prefabricated vertical drain(PVD). This paper investigated consolidation behaviors of soft ground with partially penetrated PVD subjected to artesian pressure. Laboratory tests with 1-dimensional large column equipment and their numerical analyses were carried out. Test results showed that the consolidation settlement of clay ground with artesian pressure was higher than that without artesian pressure. Due to artesian pressure, the dissipation rate of excess pore water pressure was reduced in soft ground with artesian pressure, especially at bottom part of clay ground. Numerical results were in good agreement with experimental test results.
A Study on the Selection of Borrow Pits by Using VE Techniques
Kim, Seung-Ki ; Lee, Byung-Suk ; Yang, Jae-Hyouk ; Lee, Jong-Cheon ; Kim, Chan-kee ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 59~70
DOI : 10.12814/jkgss.2016.15.1.059
The purpose of this study is to review that the VE techniques can be used as a selection tool of borrow pit locations. The analysis of the soil investigation report is performed for the selection of proposed borrow pit site on a large-scale residential development area. Possible earthwork volume of mining is estimated and the weighting matrix evaluation is applied to the VE techniques. After determining the evaluation items for VE assessment, important degree was calculated. The Rating and evaluation of performance is carried out on a proposed borrow pit site. And, development priority has to be decided for a proposed borrow pit sites. As a result, the relative construction cost is closely related to the haulage distance. As the haulage distance increases, the relative construction cost will be increased. Therefore, it was confirmed quantitatively that haulage distance has a significant impact on the select of borrow pits. Also, it was found that the condition of borrow pits itself is important, but it cannot be ignored the impact of the life cycle cost for the selection of optimal borrow pit sites.
Experimental study on flow characteristics for the high efficiency transporting of the dredged soil
Kim, Yu-Seung ; Lee, Myung-Han ; Lee, Su-Yeon ;
Journal of the Korean Geosynthetic Society, volume 15, issue 1, 2016, Pages 71~81
DOI : 10.12814/jkgss.2016.15.1.071
To evaluate the effects of magnetic force for transporting the dredged soil, magnetic energy inducing device was installed at the dredger. The whole length of transporting pipeline reaches more than 8.5km and the efficiency of the system and the characteristics of the flow are critical factors. The main parameters which govern the flow are flow-rate, velocity, concentration and slip-layer's condition, so in the field test monitoring system was applied to check the real time conditions of the closed circuit flow and the main parameters. From analyzing the relation between the dredged soil amounts and the pump power, it can be concluded that the magnetic forces effect on the transporting system, increase the transporting quantities of dredged soil and decrease power consumption of the pump.