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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
Journal Basic Information
Journal DOI :
Korean Geo-Environmental Society
Editor in Chief :
Volume & Issues
Volume 10, Issue 7 - Dec 2009
Volume 10, Issue 6 - Oct 2009
Volume 10, Issue 5 - Aug 2009
Volume 10, Issue 4 - Jun 2009
Volume 10, Issue 3 - Apr 2009
Volume 10, Issue 2 - Feb 2009
Volume 10, Issue 1 - Jan 2009
Selecting the target year
Evaluation of Static and Dynamic Characteristics of Coal Ashes
Yoon, Yeo-Won ; Chae, Kwang-Suk ; Song, Kyu-Hwan ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 5~12
This study presents static and dynamic strength of coal ashes collected from disposal site of power plant. Main compositions of coal ashes were bottom ashes. In order to evaluate static and dynamic characteristics of coal ash, NGI direct-simple shear tests, cyclic simple shear tests and direct shear tests were conducted. The strengths of coal ashes from those tests were compared to those of sands. Bottom ashes among coal ashes used for this study were classified as sand from the grain size distribution and show higher strength properties than the sands. For utilization of coal ashes in civil engineering project, mixing coal ashes with sandy soil using batch plant is inconvenient and the cost is higher than the spreading sand layer and coal layer alternately. In order to simulate both mixing type and layered type construction, sands and coal ashes were mixed with volume ratio 50:50 and prepared sand and coal ash layers alternately with the same volume ratio. From the tests mixed coal ashes-specimen shows slightly higher static and cyclic strength than the layered specimen at the same density. The higher strength seems due to the angular grain of bottom ashes. The cyclic stress ratio at liquefaction decreases rapidly as the number of cycle increases at mixed specimen than that of layered specimen.
A Study for Unsaturated-Character of Weathered Granite Soil in Korea
Lee, Hyoung-Kyu ; Lee, In ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 13~20
Generally, soil is regarded as fully saturated in Geotechnical Engineering and under ground structure design. Because it is in convenience and safety. But soils treated in field are almost in unsaturated state. Design in unsaturated state is difficult comparing with saturated soil. In unsaturated soil mechanics, parameters are usually not constant unlike saturated soil mechanics. Additionally lab or field tests in unsaturated soil mechanics are required more cost, time and theoretical difficulty. One of essential requisites for examination about unsaturated soil is Soil-Water Characteristic Curve (SWCC). It show the relation between soil suction and soil water content. Through many studies in and out of country, computation and testing methods for SWCC were introduced. But in this the country, most soil is granite soil that is widely spread in Korea. And the studies for granite soil's SWCC are not enough yet. In this paper, through studying for existing proposal methods about computation SWCC and collection data for domestic granite soils, It was determined the suitable method for domestic granite soils, and computed each granite soil's SWCC. The purpose of this paper is establishing database for domestic granite soil's SWCC as each region to convenience for applying to actual affairs. For this, studying about existing proposal methods for SWCC was performed and a computer program Soil-Vision is used. Furthermore for verification theoretical and testing methods were also performed.
The Slope Stabilization of Solid Waste Landfill Liner System
Shin, Eun-Chul ; Kim, Jong-In ; Park, Jeong-Jun ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 21~28
As the natural aggregates such as sand and clay are getting exhausted, the quantity of utilizing geosynthetics is being increased in the solid waste landfill. Especially, the waste landfills have been constructed at the gorge in the mountainous area and reclaimed land from the sea in the Korean Peninsula. Those areas are not favorable for construction of waste landfill in geotechnical engineering aspect. In this study, the frictional characteristics of geosynthetics that used in the waste landfill were estimated. Then, the studies of the behavior of geosynthetics and stability of LDCRS (Leachate Detection, Collection, and Removal System) of side slope were conducted in the waste landfill by means of the pilot test, and numerical analysis. Geocomposite which is combined type or separated type is influenced on the strain itself, and also implicated in the stress and strain of geomembrane at the lower layer. The strain on the combined type of geocomposite is about 50% smaller than that of the separated type at the side slope. The lateral displacement and settlement of top at the slope with the separated type are three times greater than that of the combined type. In the numerical analysis, discontinuous plans in between ground and geosynthetic, geosynthetic and geosynthetic, goesynthetic and waste have been modeled with the interface element. The results gave a good agreement with the field large-scale model test. The relative displacements of geosynthetics were also investigated and hence the interface modeling of liner system is appropriate for analysis of geosynthetics liner system in the waste landfill.
A Study on the Design Procedure of Mega Foundations for a High-rise Building Using Bi-Directional High Pressure Pile Load Test (BDH PLT)
Kim, Sung-Ho ; Choi, Yong-Kyu ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 29~36
In this paper, a case of a high-rise building supported by a large-diameter drilled shaft socketed in a weathered ground has been studied. The design case of pile foundation presented in this paper could be a representative example of execution of pile design through three(3) design stages of "preliminary design-proof test-supplementary design". As proof test, two(2) BDH PLT (Bi-directional High Pressure Pile Load Test) were performed at the early construction stage. By following the design process of this way, the economic pile design could be carried out and a large amount of construction cost saving could be realized.
The Point Load Index of the Daegu Shale and its Relation to the Uniaxial Compressive Strength
Lee, Young-Huy ; Youn, Chan-Ho ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 37~45
The experimental study was carried out to evaluate the characteristics of the point load index and the uniaxial compressive strength of inherently anisotropic shale in the laboratory. In the testing program the effects of size and the shape on the point load index were investigated both in the axial and diametral direction. In general, the point load index of the shale was constant when the length/diameter (L/D) ratio of the specimen is greater than 1.0 in the diametral direction. The point load index in axial direction shows slight decrease as the L/D ratio is increased and the corner breakage was observed when L/D ratio is greater than unity. The minimum point load index was observed in the bedding angle of
in the axial point load tests and of
in the uniaxial compression tests. The relationship between the point load index and the uniaxial compressive strength was linear to
for the specimen with the bedding plane angle,
at the range of
. On the other hand, this relationship was appeared linear to
when the bedding angle,
is fixed to 90
and this correlation is much different from
, which is generally applied to the rock specimen with no bedding plane in ISRM (1985). The anisotropic strength with different
angle shows the shoulder type and this can be suitably modelled by the corrected Ramamurthy'(1993)s equation with the index value of 'n' equal to 3.0.
A Comparative Analysis on Physico-Chemical Characteristics of MSW (Municipal Solid Waste) from Dwelling Site and Landfill Site - A Case Study of the Chungju City -
Cho, Byung-Yeol ; Yeon, Ik-Jun ; Lee, Byung-Chan ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 47~52
The comparative analysis on physico-chemical characteristics of municipal solid waste from dwelling site and landfill site were performed to provide the fundamental information of waste management in Chungju city. It was analysed and evaluated the bulk density, physical component, three major component, chemical component, and heating value of MSW. The physical components depended on the sampling site in dwelling site and landfill site. But, by the ultimate analysis, the chemical composition was almost similar to result for municipal solid waste from dwelling site and landfill site. Therefore, it is necessary to investigate the physical components according to sampling site for the MBT to introduce for combustible municipal solid waste pre-treatment, but it needs the chemical composition from landfill site to design the incinerator. The physical composition showed that the combustible and the noncombustible occupied 87.4% and 12.6% respectively. In case of three component analysis, the moisture, the combustible, and the ash were 27.6, 60.5, 11.9% respectively. The chemical composition through the element analysis were C (50.1%), H (6%), O (39.5%), N (1.9%), S (0.5%), and Cl (1.3%).
Characteristics Evaluation of Non Point Source Treatment Facilities in Construction Site
Choi, Young-Hoa ; Jeong, Seol-Hwa ; Kim, Chang-Ryong ; Kim, Hyo-Sang ; Oh, Ji-Hyun ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 53~62
This study was conducted to investigate characteristics of the non-point source pollution under construction and evaluate available pollution control methods. Suspended solid loading is high when soil disturbs by rainfall and this phenomenon is much more severe at the initial stage of construction than at the final one. There are three methods available for erosion and sediment control, which are check dam, silt fence, and geotextile. Check dam and silt fence are for control of suspense solids and geotextile is for preventing soil erosion during rainfall. They can be installed as temporary control facilities at construction sites. From the comparison of those methods, it was found that geotextile method was the most efficient for the runoff control of non-point source pollution. Check dam and silt fence can remove suspense solids by pore spaces to some degree, but the removal of pollutants mainly occurs through sedimentation. Because the temporary control facilities have limited removal efficiency of pollutant, they often cause civil claims and contamination of water environment. Hence, using a pressurized filtration system along with temporary control facilities, highly enhanced treatment efficiency was anticipated. In addition, the loading capacity of these techniques depends on filtration velocity and input loading. And their pre-treatments are necessary for efficient operation.
The Analysis of Lateral Movement at the Top of Retaining Wall in the Downtown Area
Bae, Yoon-Shin ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 3, 2009, Pages 63~71
The movement of in-situ walls has become very important as construction in large cities moves upward, instead of outward. Tall structures typically have deep excavations not on1y to provide extra space for parking, but also to reduce the potential settlement of the building. These large excavations require a robust bracing system to resist the lateral earth pressures as the depth increases. Methods to predict deflections of the retaining systems are of utmost importance because wall movements allow potentia1 settlement of adjacent structures. Case studies will be analyzed and measured waI1 def1ections will be compared with predictions from empirica1ly derived charts.