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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 12, Issue 4 - Dec 2013
Volume 12, Issue 3 - Sep 2013
Volume 12, Issue 2 - Jun 2013
Volume 12, Issue 1 - Mar 2013
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Experimental Study of the Changing Characteristics of Geocell with Load Carrying capacity
Hong, Seungrok ; Choi, Jinwook ; Yoo, Chungsik ; Lee, Daeyoung ; Lee, Suhyung ; Yoo, Inkyoon ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 1~13
DOI : 10.12814/jkgss.2013.12.3.001
This paper presents the results of a laboratory investigation of the porous pavement substructure effect when reinforced with geocell. In order to analyze load carrying capacity of Geocell, a series of 9 reduced-scale laboratory tests was performed, changing the type, thickness, diameter of Geocell. The results of the analyses indicated that the bearing capacity of the reinforced Geocell increases much more than the non-reinforced Geocell and load carrying capacity was considered to be insignificant according to the type of Geocell. It was also found that the most supportive effects appeared as 30 cm in diameter and 1.8mm in thickness.
Evaluation of Design Characteristics in the Reinforced Railroad Subgrade Through the Sensitivity Analysis
Kim, Dae-Sang ; Hwang, Sung-Ho ; Kim, Ung-Jin ; Park, Young-Kon ; Park, Seong-Yong ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 15~22
DOI : 10.12814/jkgss.2013.12.3.015
By changing from ballasted track to concrete slab track, new type railroad subgrade is strongly required to satisfy strict regulations for displacement limitations of concrete slab track. In this study, sensitivity analysis was performed to assess the design characteristics of new type reinforced railroad subgrade, which could minimize residual settlement after track construction and maintain its function as a permanent railway roadbed under large cyclic load. With developed design program, the safety analysis (circular slip failure, overturning, and sliding) and the evaluation of internal forces developed in structural members (wall and reinforcement) were performed according to vertical installation spacing and stiffness of short and long geotextile reinforcement. Based on this study, we could evaluate the applicabilities of 0.4 H short geogrid length with 0.4 m vertical installation spacing of geotextile as reinforcement and what the ground conditions are for the reinforced railroad subgrade. And also, we could grasp design characteristics of the reinforced railroad subgrade, such as the importance of connecting structure between wall and reinforcement, boundary conditions allowing displacement at wall ends to minimize maximum bending moment of wall.
Analysis of the Relationship between Unconfined Compression Strength and Shear Strength of Frozen Soils
Kang, Jae-Mo ; Lee, Jang-Guen ; Lee, Joonyong ; Kim, YoungSeok ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 23~29
DOI : 10.12814/jkgss.2013.12.3.023
The mechanical behavior of frozen soils is different from that of unfrozen soils due to the phase change between water and ice. The strength characteristics of frozen soils are governed by the intrinsic material properties such as grain size, ice and water content, air bubbles, and by externally imposed testing conditions such as temperature, freezing time, and strain rate. Especially, the strength of the frozen soils is generally higher than that of unfrozen soils due to ice binding capacity with soil particles, and is strongly affected by a highly complex interaction between the solid soil skeleton and the pore matrix, composed of ice and unfrozen water. In this study, the direct shear test and unconfined compression test are carried out inside of a large-scaled freezing chamber, and the relationships between cohesion and unconfined compression strength under various freezing temperature conditions are discussed.
Characteristics Analysis of Mudstone Weathered Soils in the landslide Area using Statistical Technique
Hwang, Eui-Soon ; Chung, Dae-Seouk ; Kim, Kyeong-Su ; Lee, Moon-Se ; Song, Young-Suk ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 31~41
DOI : 10.12814/jkgss.2013.12.3.031
In this study, the properties of mudstone weathered soils related to landslides were analyzed at the area of landslide induced by heavy rainfall in Pohang. The soil tests were carried out to the soils obtained from landslide and non landslide sites, and the soil properties were investigated. The correlation between soil properties and landslides were analyzed using statistical technique, and then the soil factors were extracted from the correlation analysis. The correlation equation which can calculate the coefficient of permeability influenced on landslides was proposed using the soil factors. As the result of analysis, the porosity and unit weight of soils from the landslide area is smaller than those of soils from the non landslide area. The soils with poor grain size distribution and loose unit weight are prone to landslides because the soils have a large void ratio and a low unit weight. The permeability of soils from the landslide area is larger than that of soils from the non landslide area. According to the result of correlation analysis, the effective grain size, the saturated unit weight and silt and clay contents are evaluated as the influence factors. These factors were considered to estimate the coefficient of permeability of mudstone weathered soils.
Analysis on Impact Factors of Open-cut Type Excavation Work using Numerical Analysis Method
Seong, Joo-Hyun ; Kim, Yong-Soo ; Shin, Byoung-Gil ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 43~53
DOI : 10.12814/jkgss.2013.12.3.043
In this study, an analysis about the causes of different types of excavation on accidents is required in order to prevent the frequently occurring accidents related to the earth retaining structure and excavation. Also, analysis of influence was performed by using numerical typical soil conditions and construction trend using numerical analysis method. According to the analysis results of 25 accident cases, the main influence factors were found as following: insufficient of soil survey, instability of temporary facility and lack of groundwater treatment, etc. Furthermore, in the numerical analysis result of 22 cases, drainage method was occurred larger settlement than waterproof method in the Inland. In case of applying the earth anchor method, it needs more detailed in the regions, which are discovered soft ground or rock discontinuities. Also, The consolidated clay absolutely needs further consideration of excess hydrostatic pressure.
Characteristics of Stress-Strain for Pocheon stone sludge
Kim, Chan-Kee ; Bak, Gueon-Jun ; Cho, Won-Beom ; Lee, Jong-Cheon ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 55~64
DOI : 10.12814/jkgss.2013.12.3.055
In this study, a series of the isotropic compression-expansion tests and the Undrained triaxial tests were performed on low-plastic silt of Pocheon stone sludge. Using the tests results the characteristic of the parameters of Lade`s single hardening constitutive model were investigated. We also observed that predicted values from the Lade`s single hardening constitutive model were well consistent with the observed data. In experimental results the deviator stress showed the work hardening behaviour after reaching its yield stress. Therefore practically useful failure criterion for low-plastic silt were required. The stress-strain behavior predicted by 11 soil parameters are compared with the results obtained 9 parameters by correlation between h and
. They are poor matched each other.
Characteristics of the Cut Slopes located in Mt. Jang Area, Busan
Song, Young-Suk ; Kim, Kyeong-Su ; Cho, Yong-Chan ; Lee, Choon-Oh ; Chae, Byung-Gon ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 65~73
DOI : 10.12814/jkgss.2013.12.3.065
The information of cut slope in Mt. Jang area, Busan is investigated in order to construct the Slope Management System in Urban Area. The slope inspection sheet is made to record the characteristics for cut slopes, and that is capable to be inputted slope information systematically. The cut slopes in Mt. Jang area are consisting of 69 slopes. Most of the cut slopes are constructed in cutting slope and retaining wall (CR). The cut slopes located in housing facilities are 46 slopes, and the slopes located in school facilities are 12 slopes. The traverse of cut slopes is mainly ranged from 50 m to 150 m, and the height is mainly ranged from 10 m to 20 m. The slopes combined with soil and rock are mostly distributed. The retaining wall was installed in the toe part of cut slope in order to increase the slope stability, and the additional reinforcement methods including the anchor, drainage, preventing rock fall, shotcrete and vegetation were installed at the toe part of cut slopes.
Experimental and Field Investigations for the Accuracy of the Frost Depth Indicator with Methylene Blue Solution
Kim, Hak Seung ; Lee, Jangguen ; Kim, Young Seok ; Kang, Jae-Mo ; Hong, Seung-Seo ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 75~79
DOI : 10.12814/jkgss.2013.12.3.075
The frost depth is one of important factors in the design of structures such as roadways, buried pipeline, and foundations. A frost indicator with methylene blue solution has several advantages with respect to installation cost, maintenance, and simple measurement. However, as a geotechnical engineering aspect, the accuracy of the frost indicator has not been proved yet. This paper presents experimental and field investigations of the accuracy of the frost indicator and contour maps of maximum frost depth. The contour maps of maximum frost depth can be applied to design geo-infrastructure in South Korea.
Determination of Agricultural Reservoirs Checklist by Analysis of the Weights
Shin, Eun Chul ; Shin, Chang Gun ; Ryu, Jong Mo ; Lee, Jong Keun ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 81~86
DOI : 10.12814/jkgss.2013.12.3.081
The object of this study is to determine checklists of agriculture reservoirs which local government managed at routine inspection by Analysis Hierarchy Process (AHP). Suggest definition of agriculture reservoirs and distinguish type of destruction of reservoirs through the analysis of domestic reservoirs or overseas. Draw damage factors of reservoirs from survey on specific area. Combine type of destruction and damage factors of reservoirs for decision of evaluation type of reservoirs. Then, determine optimized routine inspection checklists for agriculture reservoirs and reservoirs by means of AHP considering a weighting.
A Study on the Particle Separation Technology of Contaminated Dredged Sediments
Park, Jeong Jun ; Hwnag, Soon Gab ; Shin, Eun Chul ;
Journal of the Korean Geosynthetic Society, volume 12, issue 3, 2013, Pages 87~94
DOI : 10.12814/jkgss.2013.12.3.087
As sediment contamination problems have recently been raised in Korea, the need for technologies to remove contaminants in sediments has increased. Contaminated sediments in Korea has been annually dredged and treated using processes of coagulation/flocculation, sedimentation on barges, dewatered and dried at prepared site, and then disposed at a landfill site, which is very costly, and only a limited landfill space available in Korea. Contaminants in media containing a high percentage of silt and clay sized particles, typically, are strongly adsorbed on the particles and difficult to remove. Particle separation processes that separate the fine clay and silt particles from the coarser sand and gravel and concentrate the contaminants into a smaller volume of sediment that can be further treated of disposed of, are very effective in the post step processes. In this study are to test the feasibility of treating dredged sediments using a hydrocyclone process, and to estimate design parameters for a pilot scale test. A hydrocyclone was operated to separate larger particles from the sediments. It was found that the particle separation was greatly affected by the solid contents and inlet pressure in the hydrocyclone.