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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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Korean GeoSynthetics Society
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Volume & Issues
Volume 15, Issue 2 - Jun 2016
Volume 15, Issue 1 - Mar 2016
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Applicability Evaluation of Eco-Friendly Binder Material using Desulfurized Dust in Deep Cement Mixing Method
Ko, Hyoung-Woo ; Seo, Se-Gwan ; An, Yang-Jin ; Kim, You-Seong ; Cho, Dae-Sung ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 1~12
DOI : 10.12814/jkgss.2016.15.2.001
In this study, laboratory mixture design test and field test were performed to evaluate applicability of eco-friendly binder material (CMD-SOIL) using desulfurized dust in deep cement mixing method (DCM). As a result of laboratory mixture design test, the uniaxial compressive strength of CMD-SOIL was up to 1.136 times bigger than slag cement by changing the water content, mixing rate, and W/B. Also, it had shown the strength up to 1.222 times bigger in shell content and up to 1.363 times in mixing of floating soil. As a result of field test, field strength/laboratory design criterion strength ratio (
) is shown 0.77. And this result was similar to earlier studies. From this result, CMD-SOIL can show the same efficiency compared with existing binder.
A Study on the Infinite Slope Safty Factor Applied to the Roots Cohesion
Choi, Won-Il ; Choi, Eun-Hwa ; Suh, Jin-Won ; Jeon, Seong-Kon ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 13~24
DOI : 10.12814/jkgss.2016.15.2.013
The safety factor of an infinite slope tends to be analyzed as lower when the effects of root cohesion are not considered into the equation. Thus, it is essential to consider regional characteristics such as root cohesion and crown density in order to obtain a reasonable safety factor value. In this study, The safety factor of the landslide model, both before and after considering crown density and root cohesion, was calculated and a comparative analysis was carried out. The safety factor is increased by the effect of roots cohesion of the analysis results, the amount of increase in safety factor along the inclination of the slope angle has been analyzed with various things, the effect of reinforcing the roots cohesion, slope of the lower angle it was found that the higher the safety factor increase.
Characteristics of Sedimented Sandy in Nackdong River Delta
Kim, Byeong-Jun ; Kim, Jae-Hong ; Jung, Jin-Yeong ; Kwon, Jeong-Keun ; Kim, Tae-Hyung ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 25~33
DOI : 10.12814/jkgss.2016.15.2.025
This study was a basic research to obtain the knowledge of physical properties of the upper sedimented sandy soil in the Nakdong river delta area. The characteristics of shear strength and permeability with fine content and relative density were also investigated. The upper sedimented sandy soil near paddy and lower soft clay layers showed high percentage of fine content, and the rest parts had about 5% of fine content. The specific gravity regardless of depth and location was almost constant. The upper sedimented sandy soil mostly had particle size about 0.1 ~ 0.4mm regardless of sedimentation environment and has illite, a clay mineral, in the entire soil samples. The results of direct shear tests on remolded specimens of the upper sedimented sandy soil revealed that the friction angle and cohesion increased with relative density, but its effect was not significant. The fine content was significant, that as increasing it, the friction angle decreased and cohesion increased linearly. The permeability decreased with relative density and fine content, and the permeability of soil containing more than 15% of fine content was independent on the relative density.
Experimental Study on Drainage Characteristics of PET Aggregates
Shin, Eun-Chul ; Shin, Hui-Su ; Kim, Kyeong-Sig ; Kim, Ki-Sung ; Park, Jeong-Jun ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 35~44
DOI : 10.12814/jkgss.2016.15.2.035
PET aggregates were produced by mixing heated PET flakes with frictional soils. Using these artificially-made PET aggregates, horizontal drain tests in the laboratory, pilot scale model tests were conducted for the evaluation of the drainage characteristics of PET aggregates. Laboratory horizontal drain tests were conducted under twenty different conditions varying mixing ratios and surcharged pressures. Moreover, by utilizing the aggregates with a mixing ratio producing the lowest variation in terms of permeability against applied load, large scale tests were performed. Reliability of the test results was evaluated from comparison with the results of the laboratory horizontal drain test.
Effect of Separation Between Main and Divergent Tunnels in Divergence Section of Double-Deck Tunnel on the Stability
La, You-Sung ; Kim, Bum-Joo ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 45~54
DOI : 10.12814/jkgss.2016.15.2.045
Double deck tunnels are considered to have a large demand in a near future for solving traffic congestion problems and overcoming the limitations in constructing new tunnels. This study presents a numerical investigation using finite element (FE) analysis on the behaviors of the tunnels and the stability of pillars in a divergence section where single tunnel is diverged from a main line double deck tunnel. The effects of the separation distance between the diverged and the main tunnels and the ground condition were examined through the FE analysis by varying the separation distance from 0.1D to 2.0D (D: diameter of main tunnel) and the rock class from class I to V, respectively, and the analysis results were compared with those using empirical methods, strength-stress ratio, and the volume of interference. The FE analysis results indicated that the separation distance has a larger effect on tunnel behaviors, compared with the rock strength, and a single tunnel with a large cross section is more favorable than two separated tunnels for tunnel stability when the separation distance is below 0.7D.
Analysis on Surface Collapse of the Road NATM Tunnel through the Weathered Rock
Shin, Eun-Chul ; Yoo, Jai-Sung ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 55~64
DOI : 10.12814/jkgss.2016.15.2.055
The construction of the road NATM tunnel, which undergoes the weathered zone of the mountain, was in process with the reinforcement methods such as the rock bolt, shotcrete depositing, and the multi step grout with large diameter steel pipe. The collapse from the ceiling, and on the ground surface area(sink hole), of which were measured to be 25m from the ground surface(
), as well as excessive displacements in the tunnel, had occurred. In order to execute the necessary reconstruction work, the causes of the surface collapses were inspected through the field investigation, in-situ tests, and numerical analysis. As a result, several proper solutions were suggested for both internal and external reinforcements for the tunnel. As a result of numerical analysis, the collapsed zone of the tunnel was reinforced up to 0.5D~1.0D laterally by the cement grouting on the ground surface, 0.5D longitudinally by the multi step grout with large diameter steel pipe in tunnel. With further reinforcement implemented by rebars in lining, the forward horizontal boring was executed to the rest of the tunnel to evaluate the overall status of the tunnel face. Appropriate reinforcement methods were provided if needed.
Estimation of Ultimate Pullout Resistance of Soil-Nailing Using Nonlinear
Park, Hyun-Gue ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 15, issue 2, 2016, Pages 65~75
DOI : 10.12814/jkgss.2016.15.2.065
In this study, we constructed a database by collecting field pullout test data of the soil nailing using pressurized grouting, and suggested a method to estimate the ultimate pullout resistance using nonlinear regression analysis to overcome the problems of ultimate pullout resistance estimation using graphical methods. The load-displacement curve estimated by nonlinear regression showed a very high correlation with the field pullout test data. Estimated ultimate pullout load by nonlinear regression method was average 29% higher than estimated ultimate pullout load using previous graphical method. A sigmoidal growth model was found to be the best-fitting nonlinear regression model against rapid pullout failure. Further, an asymptotic regression model was found to be the best fit against progressive nail pullout. The unit ultimate skin friction suggested in this research reflected in the domestic geotechnical characteristics and the specifications of the pressurized grouting method. This research is expected to contribute towards establishing an independent design standard for the soil nailing by providing solutions to the problems that occur when using design charts based on foreign research.