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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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Particle Crushing Properties of Decomposed Granite Soil due to Changes in the Degree of Weathering
Lee, Kang-Il ; Yoon, Young-Goo ; Lee, Jae-Wook ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 1~10
DOI : 10.12814/jkgss.2013.12.1.001
In this study, the characteristics of particle crash of decomposed granite soil sampled at Pocheon area were presented. The degree of weathering was artificially achieved by means of hydrofluoric acid. Weathering index was firstly determined by the analysis of mineral composition. Then, particle distribution, permeability tests were conducted. The results showed that weathering effects on particle crash over entire particle sizes. Comparative analysis on specific surface between
indicated that the smaller the particle size, the more the particle crash. In addition, the most particle crashing due to compaction appeared around the optimum moisture content. The incremental ratio of specific surface appeared to decrease as weathering proceeds, which means that the higher the weathering index the less the particle crash.
Parametric Study of MD Constitutive Model for Coarse-Grained Soils
Choi, Changho ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 11~19
DOI : 10.12814/jkgss.2013.12.1.011
Coarse-grained soils are typical engineering materials commonly used in many civil engineering applications such as structural fills, subgrade and drainage fills for dam, railway and bridge. Various researches have been performed with related to constitutive laws for numerical analysis of such structures. This paper presents a parametric study for a constitutive model for coarse grained materials. The model is a kind of the bounding surface models based on critical state theory. A distinct feature of the model is to capture the response of coarse-grained materials with different void ratios and confining pressures using a single set of model parameters. The model behavior is defined with a set of elastic parameters, critical state parameters, and model-specific parameters. The parametric study was performed for the model-specific parameters. The result of parametric study shows that the model is capable to capture stress-dilatancy behavior and kinematic-hardening under non-associative plastic flow.
The Study of Optimum Lime Content for Ground Improvement of Clayey Soils and Its Effects on Plasticity and Strength Characteristics
Goo, Jeong-Min ; Choi, Changho ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 21~28
DOI : 10.12814/jkgss.2013.12.1.021
This study proposed optimum lime contents for clayey soils consisting of representative clay minerals, Kaolinite and Na-Bentonite, according to optimum lime content method (ASTM C 977-22) by means of ground improvement method of clayey soils. As geotechnical properties, the variations of atterberg limits and unconfined compressive strength were analyzed and Ca-ion and micro-structure along elapsed time were observed for lime-added clayey specimens. The test results show that optimum lime content method provides an appropriate methodology for ground improvement of clayey soils and the variation of
might be a good index to predict the rate of ground improvement for clayey soils with lime addition.
Analysis of Heavy Metal Contaminated Soils Remediation Using Reactive Drains
Park, Jeongjun ; Choi, Changho ; Shin, Eunchul ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 29~38
DOI : 10.12814/jkgss.2013.12.1.029
This paper presents the analysis condition of remediation technique of contaminated fine-grained soil and physical properties of bio-degradable drain for analysis site applicability using bio-degradable drain method. As the result, two kinds of developed degradable drains (cylindricality shaped and harmonica shaped) are satisfied the Korean Industrial Standard. And the cylindricality shaped drain has an excellent discharge capacity than that of another one. By the results of laboratory test, the citric acid is chosen as the washing agent because it has low toxicity, so it is able to minimize harmful influence to environment. Furthermore the subject contaminants were selected as Cd, Cu and Pb. Based on the field pilot test results, the most remedial efficiency is the use of reactive material applied in bio-degradable drain method with the process of injecting the washing agent and extraction of contaminated fluid.
Experimental Study of Down-Scaled Model Slope on the Variation of the Ground Water Level of Drainable Soil Nailing
Kim, Young-Nam ; Chae, Young-Su ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 39~50
DOI : 10.12814/jkgss.2013.12.1.039
This study aims at investigating the behavior of the ground water level when installing upward soil nails that drain water as well. To do this, a series of down-scaled model tests were conducted. A model slope with weathered soils was prepared and then an artificial rain was scattered on the slope. The relative densities of soil specimen were 60%, 75%, and 90%, and the rainfall intensities 50mm/hr, 75mm/hr, 100mm/hr, and 125mm/hr, respectively. The experimental parameters, such as the ground water level, ratio of soil runoff, and failure mode of the slope were measured and analyzed. As the results, It may be concluded that the ground water level in the slope supported by drainable upward soil nails increases very gradually while the unsupported soil changes dramatically. In addition, the ground water level becomes constant and no failure occurs as time goes by. In case of the relative density of 75%, the runoff ratio seemed to increase up to about 8~15% after reinforcement.
Quantitative Evaluation of Geotextile Void Structures Using Digital Image Analysis
Kim, Duhwan ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 51~61
DOI : 10.12814/jkgss.2013.12.1.051
This paper presents results from a study undertaken to quantitatively evaluate the geotextile pore sizes using optical image analysis. The evaluation was conducted by observing surfaces of coupons cut from resin-impregnated specimens of geotextile-geomembrane layered under various load conditions. Stereological concepts were applied to collect representative specimens from a series of laboratory tests. The sizes of voids enclosed by filaments were expressed in terms of the largest inscribing opening size (LIOS) distribution. The opening diameter corresponding to the 50% cumulative frequency decreased by about 45mm as the load increased from 10 to 300kPa and recovered to about 90% of its initial state on unloading back to 10kPa. The average void size was reduced by 32 and 16.5% as the geotextile was sheared against a textured geomembrane under normal stresses of 100 and 300kPa, respectively. The results showed how the LIOS distribution varied as a function of normal stress and interface shear displacement against a smooth and a textured geomembrane surfaces.
A Study of MD Constitutive Model Calibration for Coarse-grained Soils
Choi, Changho ; Shin, Dong-Hoon ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 63~72
DOI : 10.12814/jkgss.2013.12.1.063
The structural stability of fill dam largely depends on the engineering behavior of rock materials used as main zone for dam construction and it is necessary to understand well the stress-strain characteristics of fill materials as well as shear strength property. In addition, the numerical analysis of fill dam requires a thorough study for calibrating material properties and parameters of a coarse-grained soil constitutive model. In this paper, large triaxial test results for Buhang-dam fill materials are analyzed and constitutive model parameters are calibrated based on the test results. It is shown that MD constitutive model is capable to predict the stress-strain behavior of dense and loose coarse-grained soils used for Buhang-dam construction based on the comparison study between the experimental test result and numerical simulation.
A Study on Friction Characteristics of Backfill Material for Heat Transport Pipeline
Kim, You-Seong ; Park, Young-Jun ; Cho, Dae-Seong ; Bhang, In-Hwang ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 73~81
DOI : 10.12814/jkgss.2013.12.1.073
The objective of this paper is to minimize installation length of pipeline and to reduce burial depth for construction by increasing the friction coefficient caused by the interface between backfill material and pipeline. And then, the sufficient friction coefficient shortens the length of expansion joint pipe and gives the life extension of expansion joint absorber for efficient procedure regarding maintenance and administration of construction. The backfill material which is developed in this study has larger and smaller friction angle than that of conventional backfill material (river sand). The backfill material with tire powder provides low friction angle at curved section when pipe diameter increases in size (38% reduction at pipe diameter in 900 mm). When using backfill material with river sand and fly-ash, the mixture mixed with 1.5% fly-ash has 30% and that with 3% fly-ash has 50% reduction effect for minimum installation length of expansion joint pipe.
A Study on the Comparison among Effect of Thermal Dissipation of Backfill Materials for Underground Power Cables
Kim, You-Seong ; Park, Young-Jun ; Cho, Dae-Seong ; Kim, Jae-Hong ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 83~92
DOI : 10.12814/jkgss.2013.12.1.083
Backfill material with thermal resistivity which has
-cm/Watt in wet and
-cm/Watt in dry is requested to improve the power transfer capability for dissipation of heat production in underground power cables. In the field test performed by buried cable backfills, the backfill material developed from this study is compared with river sand and weathered soil (native soil) to investigate the effect of heat transfer in various seasons and locations of thermal sensors. As a result, the developed backfill material is faster approaching yielding temperature (critical heat) than that of river sand and weathered soil, and it has good dissipation capacity rather than other materials by keeping moisture content at dry season.
Evaluation Method of Frost Heave for Unsaturated Soils
Kang, Jae-Mo ; Kim, YoungSeok ; Lee, Jangguen ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 93~100
DOI : 10.12814/jkgss.2013.12.1.093
Frost heave occurs when ground temperature decreases under
and soil volume expands, which causes roadway and buried pipe line failure due to differential heaving. There are several models to predict volumetric strain caused by frost heave, but they requires expertises who have professional background and experience related to numerical analysis. This study presents an evaluation method to predict volumetric strain caused by frost heave with fundamental physical properties of soils. The evaluation method is assessed with experimental results.
A Study of Connection Stability for Reinforced Retaining Wall Constructed with Soilbag with Varying Connection Strength
Lee, Sang-Moon ; Choi, Changho ; Shin, Eun-Chul ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 101~107
DOI : 10.12814/jkgss.2013.12.1.101
Environmental-friendly and economical construction are the recent issues for civil structures and soilbag as facing wall is widely used for cut-slope remediation projects. However, the stability of structures is an important issue for the use of environmental-friendly and economical materials. In order to understand the stability of soilbag reinforced retaining wall, tensile resistance, rupture, tensile strength, and internal/external safety factor of the wall were analyzed with MSEW program and the results were compared to the safety factor of block-type reinforced walls. The stability of retaining wall was analyzed with reduction coefficients of connection strength to check the connection stability. Because it is possible to move between soilbag and geogrid connector for soilbag retaining wall, the safety factor of the wall was analyzed with different inclination angles of soilbag. The analysis result shows that the connection strength and internal/external stability of soilbag reinforced wall satisfy the stability criteria.
Analysis on Failure Causes and Stability of Reinforced Earth Wall Based on a Field Case
Hong, Kikwon ; Han, Jung-Geun ; Lee, Jong-Young ; Park, Jai-Seok ;
Journal of the Korean Geosynthetic Society, volume 12, issue 1, 2013, Pages 109~114
DOI : 10.12814/jkgss.2013.12.1.109
This paper describes the global stability of the reinforced earth wall, which was collapsed by heavy rainfall. The seepage analysis was conducted to confirm the change effect of groundwater level on slope with reinforced earth wall. The seepage analysis result confirmed that the change of groundwater level is greatly influenced by rainfall. According to the change of groundwater level, the global stability analysis with reinforced earth wall was conducted based on the results of seepage analysis. The safety factor of the slope was 0.476 when the wall is collapsed firstly. The collapse cause analyzed that soil strength was weaken because the ground was saturated by continuous rainfall. Therefore, the global stability, which is considered heavy rainfall, should be conducted at design and construction of reinforced earth wall.