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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geotechnical Society
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Journal DOI :
Korean Geotechical Society
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Volume & Issues
Volume 28, Issue 12 - Dec 2012
Volume 28, Issue 11 - Nov 2012
Volume 28, Issue 10 - Oct 2012
Volume 28, Issue 9 - Sep 2012
Volume 28, Issue 8 - Aug 2012
Volume 28, Issue 7 - Jul 2012
Volume 28, Issue 6 - Jun 2012
Volume 28, Issue 5 - May 2012
Volume 28, Issue 4 - Apr 2012
Volume 28, Issue 3 - Mar 2012
Volume 28, Issue 2 - Feb 2012
Volume 28, Issue 1 - Jan 2012
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Characteristics of Lateral Flow due to Embankments for Road Construction on Soft Grounds Using Vertical Drain Methods
Hong, Won-Pyo ; Kim, Jung-Hoon ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 5~15
DOI : 10.7843/kgs.2012.28.9.5
Field monitoring data for embankments in thirteen road construction sites at coastal area of the Korean Peninsula were analyzed to investigate the characteristics of lateral flow in soft grounds, to which vertical drain methods were applied. First of all, the effect of the embankment scale on the lateral flow was investigated. Thicker soft soils and lager relative embankment scale produced more horizontal displacements in soft grounds. Especially, if thick soft grounds were placed, the relative embankment scale, which was given by the ratio of thickness of soft ground to the bottom width of embankments, became larger and in turn large horizontal displacement was produced. And also higher filling velocity of embankments induced more horizontal displacements in soft grounds. The other major factors affecting the lateral flow in soft ground were the thickness and undrained shear strength of soft grounds, the soil modulus and the stability number. Maximum horizontal displacement was induced by less undrained shear strength and soil modulus of soft grounds. Also more stability numbers produced more maximum horizontal displacements. When the shear deformation does not develop, the stability number was less than 3.0 and the safety factor of bearing was more than 1.7. However, if the stability number was more than 5.14 and the safety factor of bearing was less than 1.0, the unstable shear failure developed in soft ground. 50mm can be recommended as a criterion of the allowable maximum horizontal displacement to prevent the shear deformation in soft ground, while 100mm can be recommended as a criterion of the allowable maximum horizontal displacement to prevent the shear failure in soft ground.
Geo-Morphological Study of Sand Dune for Railway Project in UAE
Moon, Joon-Shik ; Kim, Jae-Young ; Lee, Seung-Bok ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 17~22
DOI : 10.7843/kgs.2012.28.9.17
Wind blown sand is expected to disrupt the operation of the railway as the presented railway project in this paper consists of large earthworks in extreme topography of the mega dune fields. For successful railway construction in sand dune area, effective mitigation measure is the most important factor to protect the track from wind blown sand. The effective mitigation measure requires an integrated consideration of the earthworks geometry and the direct control measures such as fence system. Basically there`s no perfect measure protecting railway track from wind blown sand, and it would be more economical and effective to develop robust, deliberate maintenance program for track and direct control measure on the basis of geo-morphological study. The purpose of this study is to identify the large scale geo-morphological terrains and specific sand dune morphology in the project area in UAE and estimate the direction and migration rate for sand dunes with the local variations in prevailing wind directions by undertaking literature review, and aerial photographs, satellite images, and ground studies.
Slope Stability Analysis of Unsaturated Soil in Debris-Flow Occurrence Slopes
Kwak, Cheol-Soo ; Park, Byung-Soo ; Yoo, Nam-Jae ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 23~30
DOI : 10.7843/kgs.2012.28.9.23
This paper is research results of slope stability analysis associated with seepage infiltration for unsaturated soil in debris-flow occurrence slopes. Site investigations were carried out in two slopes, located at Inje in Kangwon province where debris flow occurred in 2006 and at Yangpyung in Kyeunggi province where it occurred in 2010. For unsaturated soil sampled at the zone of debris-flow initiation, soil water characteristic curves with tempe pressure cells and shear strength parameters with newly designed shear strength apparatus were obtained respectively. The commertially available software SEEP/W was used to analyze seepage infiltration in unsaturated soil, based on their properties obtained from test results and the actual rainfall data at the moment of debris flow occurrence, and slope stability analysis with the program of SLOPE/W, associated with results of seepage analysis, was performed to simulate slope failure. As results of this research, seepage infiltration to unsaturated soil due to intensive rainfall was found to cause increase of ground water table as well as degree of saturation. Through this research slope stability analysis for unsaturated soil, considering the actual rainfall characteristic, might be a reasonable method of investigating characteristics of debris flow behavior, in particular, the moment of debris flow occurrence.
Evaluation of Stability of Quay Wall Considering Overtopping of Tsunami
Lee, Kwang-Ho ; Kim, Do-Sam ; Kim, Tae-Hyung ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 31~45
DOI : 10.7843/kgs.2012.28.9.31
This study was conducted to estimate the stability of a quay wall in case of wave overtopping under the combined action of an earthquake and tsunami using limit equilibrium method. The tsunami force was calculated by using a numerical program called TWOPM-3D (3-D one-field Model for immiscible TWO-Phase flows). Especially, the wave force acting behind the quay wall after a tsunami wave overtopping was estimated by treating back fill as a permeable material. The stability of the quay wall was assessed for both the sliding and overturning modes under passive and active conditions. The variation in the stability of the quay wall with time was determined by parametric studies, including those for the tsunami wave height, seismic acceleration coefficient, internal friction angle of the soil, wall friction angle, and pore water pressure ratio. When the earthquake and tsunami were considered simultaneously, the tsunami induced wave overtopping increased the stability of the quay wall under the passive condition, but in the active condition, the safety factors decreased.
Comparison of Shear Properties of Crumb Rubber-Bottom Ash Mixture Considering Reinforcement Types of Waste Fishing Net
Kwon, Soon-Jang ; Kim, Yun-Tae ; Ahn, Jae-Hoon ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 47~55
DOI : 10.7843/kgs.2012.28.9.47
This paper investigates the shear properties of crumb rubber-bottom ash mixture reinforced by waste fishing net (WFN). Mixtures used in this experiment consist of crumb rubber and bottom ash (2mm~10mm) with the same weight ratio. In this study several series of direct shear tests were carried out on the five different specimens : unreinforced mixture, reinforced mixtures with 1 or 2 single-layered WFN, reinforced mixtures with 1 or 2 double-layered WFN. The experimental results indicated that the shear properties of reinforced crumb rubber-bottom ash mixture were strongly influenced by reinforcing layer of WFN. It was found that the shear strength and internal friction angle of the mixtures increased with an increase in reinforcing layer of WFN due to interlocking effect and friction between mixture and WFN.
Analysis of Piled Raft Interactions on Clay with Centrifuge Test
Park, Dong-Gyu ; Choi, Kyu-Jin ; Lee, Jun-Hwan ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 57~67
DOI : 10.7843/kgs.2012.28.9.57
In the design for piled rafts, the load capacity of the raft is in general ignored and the load capacities of pile are only considered for the estimation of the total load carrying capacity of the piled raft. The axial resistance of piled raft is offered by the raft and group piles acting on the same supporting ground soils. As a consequence, pile - soil - raft and pile - soil interactions, occurring by stress and displacement duplication with pile and raft loading conditions, acts as a key element in the design for piled rafts. In this study, a series of centrifuge model tests has been performed to compare the axial behavior of group pile and raft with that of a piled raft (having 16 component piles with an array of
) at the stiff and soft clays. From the test results, it is observed that the interactions of piles, soil, and raft has little influences on the load capacities of piles and raft in piled rafts compared with the load capacities of group piles and raft at the same clay soil condition.
A Study on Decreasing Behavior of Strength & Elastic Parameters due to Water Infiltration in Rock Cores (I)
Cho, Hong-Je ; Moon, Jong-Kyu ; Jeong, Il-Soo ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 69~83
DOI : 10.7843/kgs.2012.28.9.69
A study on strength decrease due to water contents through infiltration has been conducted with 9 rocks of high frequency in Korea. It has been proved that a strength decrease through infiltration has high dependence on rock strengths ranges while the species of rock have no impact. It has been found that the weaker the rocks are, the more sensitive the strength decreases are, and that water content of 0.5% corresponds to strength decrease of almost 50%. Another finding is that most rocks have a failure when water content is about one quarter~one half of its saturation. It has been shown that the weakening of rock strength due to water content results from leaching and the weakening of bonding strength of cementation materials.
The Evaluation of the Field Applicability of the Soil Improving Method Using the Environment-friendly Organic Acid Material
Lee, Jong-Hwi ; Hong, Jong-Ouk ; Jin, Youngguo ; Chun, Byung-Sik ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 85~95
DOI : 10.7843/kgs.2012.28.9.85
The method of using organic acid is more environment-friendly for it improves the strength of the ground. The method of proliferating microbes makes soil particle bonded, finally improves the strength of the ground and decreasing permeability. Although there has been the research on the effect of strength increasing, there has never been a research on the evaluation of field application. In this paper, through the light drop weight test, the dynamic cone penetration test, the field density test, the variation of strength was investigated in the mixed ground with organic acid for 56 days. As the results of the field test, it was found that the strength and stiffness of the ground increased with organic acid, and that through SEM-EDS, the precipitation of calcium carbonate made by specified microbe obviously increased with organic acid material and so the ground was improved. Therefore, the sustainable development of this method needs to be analysed more in the future.
Influences of Confining Pressure and Fines Content on Compressibility Characteristics of Sand
Kim, Uk-Gie ; Zhuang, Li ; Kim, Ju-Hyun ;
Journal of the Korean Geotechnical Society, volume 28, issue 9, 2012, Pages 97~106
DOI : 10.7843/kgs.2012.28.9.97
In order to investigate mechanics of mixtures composed of sand and non-plastic silt, various specimens, with sand dominating the soil structure, and with varying fines content, fines content varying were produced. Isotropic consolidation tests were performed using high pressure triaxial test apparatus within high pressure levels where sand grain crushing happened. Experimental results showed that compressive curve of sand after yielding contracts to the NCL due to breakage of sand grains. Moreover, with the increase of fines content, coarse grains are surrounded by fines to form cushion effect, which made the breakage of coarse grains become difficult. Therefore, the maximum inclination of compressive curve became flatter and yield stress increased.