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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 13, Issue 4 - Dec 2014
Volume 13, Issue 3 - Sep 2014
Volume 13, Issue 2 - Jun 2014
Volume 13, Issue 1 - Mar 2014
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Behavior Characteristics of Water Supply Pipeline Due to Freezing Temperature
Shin, Eun Chul ; Ryu, Byung Hyun ; Kang, Hyoun Hoi ; Hwnag, Soon Gab ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 1~10
DOI : 10.12814/jkgss.2014.13.4.001
This paper presents the results of a field pilot test about deformation of water supply pipelines due to freezing temperature. There is a difference between for frost heaving load to act on the water supply pipelines. If the Marston-Spangler theory is only considered for the frost heaving load to act on the water supply pipeline, it is likely to deviate from the safety of the water supply pipeline, strains of the water supply pipeline show a tendency of smaller value than the value of numerical analysis.
Stability Evaluation of Reinforced Subgrade with Short Geogrid for Railroad During Construction
Kim, Dae Sang ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 11~20
DOI : 10.12814/jkgss.2014.13.4.011
The behaviors and stability of reinforced subgrade with short geogrid were examined and evaluated during construction. First of all, analytical approach for the minimum length of geogrid was performed to guarantee stability during construction loading state. Secondly, the economic aspects for reinforced subgrade were compared with between domestic standards applying with 0.7 H reinforcement length and new way to mix short and long reinforcement. Full scale railroad subgrade was constructed with the size of 5 m high, 6m wide, and 20m long to verify the stability of the subgrade with the length of 0.3 H, 0.35 H, 0.4 H reinforcement. Total 51 sensors were installed to measure settlement, bulging, and the change of stress of the subgrade. It is concluded that the reinforced subgrade with short(0.35H, 35% of height) geogrid had stability within allowable level of deformation and stress increment during construction.
Effect of Foundation Flexibility of Offshore Wind Turbine on Force and Movement at Monopile Head
Jung, Sungmoon ; Kim, Sung-Ryul ; Lee, Juhyung ; Le, Chi Hung ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 21~31
DOI : 10.12814/jkgss.2014.13.4.021
Recently, the research on renewable energy against depletion of fossil fuel have been actively carried out in the world. Especially, offshore wind turbines are very economical and innovative technology. However, offshore wind turbines experience large base moments due to the wind and wave loading, so the monopile with large diameter needs to be applied. For the economical design of the large diameter pile, it is important to consider the flexibility of the foundation to estimate the maximum moment accurately, based on studies conducted so far. In this paper, the foundation was modeled using the finite element method in order to better describe the large diameter effect of a monopile and the results were compared with those of p-y method. For the examples studied in this paper, the change in maximum moment was insignificant, but the maximum tilt angle from the finite element method was over 14% larger than that of p-y method. Therefore, the finite element approach is recommended to model the flexibility effect of the pile when large tilt angles may cause serviceability issues.
A Study on the Consolidation Characteristics Using the Constant Strain Rate Test of Remolded Gwangyang Marine Clay
Jang, Joeng-Min ; Kim, Jin-Young ; Joeng, Woon-Ki ; Choi, Jin ; Jin, Young-Sik ; Kang, Kwon-Soo ; Baek, Won-Jin ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 33~43
DOI : 10.12814/jkgss.2014.13.4.033
Recently, the case to construct the structure on the soft clayey ground has increased and in order to the reduction of the cost of construction and maintenance on the social infrastructure facilities we have been trying to improve the soft clayey ground using the existing methods such as the pre-loading method and the vertical drain method. Like this, when various ground improvement methods are applied on the soft clayey ground, a long-term consolidation settlement will be key issue due to low permeability coefficient of cohesive soil. According to existing research results that relate to the consolidation settlement, the loading periods for existing the standard consolidation test (Oedometer test) to obtain the consolidation parameters are needed for minimum ten days or more. Therefore, in this study, the standard consolidation test (24 hours step-loading) and constant strain rate consolidation test changed by strain rate was performed using the remolded marine clay on Gwangyang bay composed of a soft clayey ground of the south-west coast. From the laboratory test results, the characteristics of compression, strain-effective stress relations by constant strain rate and the variation characteristic of the pore water pressure by different of loading speed and the relation between consolidation parameters and constant strain rate are compared and analyzed.
Experimental and Numerical Investigation of the Performance of Vertical Thermosyphon for Frozen Ground Stabilization
Lee, Jangguen ; Lee, Chulho ; Jang, Changkyu ; Choi, Changho ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 45~56
DOI : 10.12814/jkgss.2014.13.4.045
Frozen ground in cold region consists of an upper active layer and lower permafrost which is permanently frozen land. During the summer season, the air temperature is high enough to make the frozen ground melt, which causes the reduction of soil strength and thaw settlement. These phenomena result in structural instability, so it is necessary to apply frozen ground stability techniques. Thermosyphon is a closed natural two-phase convection device to maintain the ground temperature below
by extracting heat from the ground and discharges it into the atmosphere. Experimental and numerical investigation has been performed to estimate the effect of the refrigerant filling ratio in thermosyphon using R-134a refrigerant and the thermal conductance of the thermosyphon.
A Study on Utility for Fine Aggregates and Engineering Characteristics by Mineralogical Composition of Sands on the Coast of Jeju Island
Kim, Seung Hyun ; Lee, Dong Wook ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 57~68
DOI : 10.12814/jkgss.2014.13.4.057
This study categorizes the distributed sand around coastal area of Jeju volcanic Island into three groups according to their components, and arranges their characteristics. In the case of basic physical properties, the silicate sand has slightly greater specific gravity than general sand, and the carbonate sand with widespread distribution has a lower specific gravity. In the gross, the carbonate sand has poor particle classifying and low uniformity coefficient because carbonate minerals of relatively large grain size are mixed. The relation between compressive strength and components shows conflicting tendency that silicate and carbonate components have positive correlation and negative correlation with compressive strength, respectively. Based on the components ratio of one to one, the sand having low carbonate component ratio is expected to be able to utilize in construction fine aggregate. To compare between square root (ACI 308) and cube root (KCI 2012) of compressive strength at computation of elastic modulus, it is considered to non-dimensional elastic modulus.
Unsaturated Shear Strength Characteristics of Nakdong River Sand and Clay
Lee, Dae-Young ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 69~75
DOI : 10.12814/jkgss.2014.13.4.069
The shear strength characteristics of an unsaturated earth material are highly important not only for evaluating the seepage characteristics but also the stability of levee for a lifelong. In this study, unsaturated strength characteristics of Nak-dong river sand and clay that frequently used for the levee construction in southern province of Korea were analyzed using unsaturated triaxial compressive test. The strength characteristics due to the variation of matric suction were analyzed using multi-stage compression technique and the results were directly compared with the non-linear formulation for the apparent cohesion (
), and the friction component
were determined and evaluated from the test for the application of linear Mohr-Coulomb failure criteria. Cohesion and friction characteristics of the unsaturated levee material under various suction phases were also explored during this study.
Applicability of Bi-directional Load Test for Evaluating Bearing Capacity of Helical Piles
Lee, Dongseop ; Na, Kyunguk ; Lee, Wonje ; Kim, Hyung-Nam ; Choi, Hangseok ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 77~85
DOI : 10.12814/jkgss.2014.13.4.077
The helical pile has become popular with some constructional advantages because relatively compact equipment is needed for installing helical piles. However, field loading tests for estimating the bearing capacity of helical piles have drawbacks that the required dead load should be as much as the operation load, and reaction piles or anchors are required. In this paper, the bi-directional load test without necessity of reaction piles and loading frames was applied to the helical pile, and the load-settlement curves of the helical piles were measured. The bi-directional load test was performed in two separate stages with the aid of a special hydraulic cylinder whose diameter is equal to that of the pile shaft. In the first stage, the hydraulic cylinder is assembled immediately above the bottom helix plate, and the end bearing capacity of the helical pile is measured. In the second stage, the hydraulic cylinder is assembled above the top helix plate, and the skin friction of the helical pile is measured. The pile loading-test program was carried out for the two different helical piles with the shaft diameter of 89 mm and 114 mm, respectively. However, the configuration of helix plates is identical with three helix plates of 450-, 350-, 200- mm diameter. Results of the bi-directional load test were verified by the conventional static pile loading test. As a result, the bearing capacity estimated by the bi-directional load test is in good agreement with the result of the conventional pile loading test.
Reliability Analysis for Optimization of Construction Method of Drain Material
Ahn, Hyeon-Min ; Kim, Moon-Chae ; Kim, Daehyeon ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 87~96
DOI : 10.12814/jkgss.2014.13.4.087
In this paper, reliability analysis was done on the characteristics of consolidation and settlement for the inner temporary dike where a weak ground improvement construction was applied. When the consolidation analysis on the foundation ground was done, the following conclusions were obtained by conducting the stability analysis on the effect of space of drains, the effect of consolidation time, and the residual settlement and differential settlement. When construction was done with a drain space which satisfied 95% probability of reaching a target consolidation in each divided area, the occurrence of a residual settlement was within the range, which did not exceed 10cm. It was shown that there was almost no possibility of the occurrence of differential settlement, which was above the permissible differential settlement slope.
Modelling and Analysis of Roll-Type Steel Mats for Rapid Stabilization of Permafrost (I) - Modeling -
Moon, Do Young ; Kang, Jae Mo ; Lee, Janggeun ; Lee, Sang Yoon ; Zi, Goangseuo ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 97~107
DOI : 10.12814/jkgss.2014.13.4.097
Finite element modelling and analysis were conducted for the roll-type steel mats which were placed on loose sand and subjected to a standard truck wheel load in this study. The roll-type steel mats mean that the steel mats can be folded as a circle shape for the carrying to fields in cold regions where workability is limited and are developed for a rapid rehabilitation method for roadway across soft ground which is caused by thawing during the summer season in cold regions. The model is composed of link elements to simulate nonlinear behavior of connections between steel mats, thick shell elements to have flexural stiffness of the steel mats, and springs to simulate characteristics of foundation soils. The structural behaviors of the shell, link elements, and springs were verified at each modelling step through experiment and analysis. Beam and shell analysis without the link elements were conducted and compared to results obtained from the model presented in this study. Significant vertical displacement is shown in the shell model with hinge connections. Therefore, the results demonstrate that the analysis model for the roll-type steel mats on loose sand needs further detail parametric studies.
Modelling and Analysis of Roll-Type Steel Mat for Rapid Stabilization of Permafrost (II) - Parametric Analysis -
Moon, Do Young ; Kang, Jae Mo ; Lee, Janggeun ; Lee, Sang Yoon ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 109~117
DOI : 10.12814/jkgss.2014.13.4.109
Using the finite element analysis model presented in accompanying paper, parametric study was performed in this paper. Various parameters were considered such as the width of wheel loads-induced permanent plastic deformation, backfill, equivalent thickness and orthogonal characteristic of steel mats. The effects of these parameters were analyzed for vertical and rotational displacements, maximum moment and tensile stress. From the parametric studies, it is found that great vertical deflection and tensile stress above allowable flexural tensile strength are developed in steel mats by the wheel loads-induced permanent plastic deformation. Backfill or increasing the thickness of steel mats is a feasible solution on this problem.
Development of Advanced Dynamic Cone Penetration Test Apparatus and Its Application Performance Evaluation
Kim, Uk-Gie ; Zhuang, Li ; Lee, Kwang-Wu ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 119~131
DOI : 10.12814/jkgss.2014.13.4.119
For quick and accurate ground investigation in wide construction site being not easy to access, advanced dynamic cone penetration test equipment was developed based on widely used equipment abroad. Advantages of existing equipment of portability and simple testing method were reflected in the new developed equipment. Meanwhile, by extending connection of lower rod, penetration depth is raised to 6m from 1 m of the existing equipment. Moreover, by assembly of hammer (2+3+3kg) and cone (3 types) etc., it is possible to perform test under the same conditions with those by German and Japan dynamic cone penetration test equipment (Tsukuba, PWRI and SH types). Auxiliary equipment was applied to make sure of perpendicularity as penetration depth increases. Applicability of the new developed equipment was evaluated through tests on various fields and its reliability was verified.
Database Construction Plan of Infrastructure Safety Inspection and In-depth Inspection Results
Ryu, Jong Mo ; Shin, Eun Chul ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 133~141
DOI : 10.12814/jkgss.2014.13.4.133
This study was carried out to establish the database system by using the safety inspection and in-depth inspection results for infrastructures such as bridges, tunnels, dams, and water supplies. A classification system of each facility was proposed by standardizing items for inspection & diagnosis in order to automatize work process. Also, it justifies data structure based on database from pre-investigation to field survey, evaluation of facilities, and report making. In addition to this, it suggests improvement plans of relative regulations and guidelines such as Facility Management System(FMS), operational regulation, and inspection detailed guideline to make inspection result database of infrastructures which can be used effectively.
Stability evaluation of reinforced earth walls based on large-scale modular blocks
Han, Jung-Geun ; Kim, Min-Woo ; Hong, Kikwon ; Yun, Jung-Mann ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 143~151
DOI : 10.12814/jkgss.2014.13.4.143
This paper describes external and internal stability of reinforced earth wall using large-scale modular block and geogrid reinforcement. The evaluation for external and internal stability was conducted to analyze effect of wall height, reinforced soil (or backfill soils) and reinforcement strength. The external stability showed that the analysis cases were satisfied with design criteria, when the required minimum length and vertical spacing of reinforcement were 0.7H and 1m, respectively. The internal stability conformed that some cases were satisfied with design criteria in
of internal friction angle of reinforced soil. Expecially, it will be applicable as wall structure considering a structural stability and economic efficiency based on evaluation of internal stability.
Analysis of Frozen Reduction Effect and Economic Evaluation of Recycled PET-Soil
Shin, Eun Chul ; Shin, Hui Su ; Kim, Gi Sung ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 153~159
DOI : 10.12814/jkgss.2014.13.4.153
During the winter and spring seasons in Korea, structures such as buried water supply pipelines, roads, railways are frequently damaged due to frost heaving and thawing. Until now, the method of substituting the frost susceptible soil with the gravel or rubbles those are non-frost susceptible materials have been employed in Korea to prevent frost heaving. A series of laboratory soil tests and indoor frozen soil engineering experiments, as well as laboratory frost heaving tests were conducted for seeking the means of utilizing recycled PET bottles as substitute material.
A case study on reinforcement and design application of reinforced earth wall using micro pile
Hong, Kikwon ; Han, Jung-Geun ; Lee, Kwang-Wu ; Park, Jong-Beom ;
Journal of the Korean Geosynthetic Society, volume 13, issue 4, 2014, Pages 161~167
DOI : 10.12814/jkgss.2014.13.4.161
This paper describes reinforcement method of reinforced earth wall near the abutment. The excessive displacement of a case affected by reduction of bearing capacity due to macro-environment condition like a coast. That is, the front displacement of reinforced earth wall has been happening continuously due to strength reduction of foundation ground. The micro pile is applied to reinforcement method, in order to secure a bearing capacity and global slope stability of reinforced earth wall. The results of numerical analysis confirmed that reinforcement method based on micro pile can secure a stability of structure, while the reconstruction of reinforced earth wall is impossible by construction and macro-environment condition.