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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
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Volume & Issues
Volume 12, Issue 12 - Dec 2011
Volume 12, Issue 11 - Nov 2011
Volume 12, Issue 10 - Oct 2011
Volume 12, Issue 9 - Sep 2011
Volume 12, Issue 8 - Aug 2011
Volume 12, Issue 7 - Jul 2011
Volume 12, Issue 6 - Jun 2011
Volume 12, Issue 5 - May 2011
Volume 12, Issue 4 - Apr 2011
Volume 12, Issue 3 - Mar 2011
Volume 12, Issue 2 - Feb 2011
Volume 12, Issue 1 - Jan 2011
Selecting the target year
Determination of Optimal Section for Corrugated Steel Plates
Na, Ho-Sung ; Choi, Dong-Ho ; Yoo, Hoon ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 5~12
In this paper, after studying structural performance for the representative corrugated steel plate used in Korea, we proposed the optimum shape for section of corrugated steel plate considering a width of steel plates that can be produced currently in the factory. Using AISI(1986) in examination for the performance of the corrugated steel plate, we determined the mechanical limit of the optimum sections considering shear force and bending moment of corrugated steel plate and also determined the geometric limit of them considering formability, shapes and ratio between width of steel plate before forming and that after forming. As a result of examination for performance of steel plate applying algorithm for searching optimal sections algorithm developed in this study to the existing representative corrugated steel plate, allowable force and moment of inertia indicated the maximum values at bending radius 76mm and internal bending angle
. And as an application result of the optimum design system that used SS490 with 1,550mm of width and 4,700mm of length considering current production situation in Korea, we developed the new section with more than 2 times of structural performance comparing with existing corrugated steel plate.
Temperature Transition Characteristics of Penetration Type Probes
Jung, Soon-Hyuck ; Yoon, Hyung-Koo ; Lee, Jong-Sub ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 12~25
Various penetration type penetrometers such as CPT and DMT have been used for obtaining high resolution soil properties under the minimized disturbance effects. The cone type penetrometer, which can measure cone tip resistance, sleeve friction, and pore-water pressure using strain gauge type sensor and electrical resistivity probe, is affected by temperature changes during penetration into soils. In this study, temperature transition probe(TTP) whose diameters are 5mm and 10mm are manufactured using thermometer and temperature sensor. The internal temperature transient process of cone penetrometer is analyzed in various soil conditions. The temperature sensor is attached on 4 points of cone inside in consideration with electrical disturbance between electrical resistivity module and temperature sensor itself and the adhesion points of strain gauges. The test was performed in large-scale acrylic cell with 30-cm diameter and 60-cm height and small-scale cell with 20-cm diameter and 40-cm height using Jumunjin sand and glass beads, respectively, as controlling densities and temperatures of specimens under saturated conditions. The test results indicate that the larger temperature changes generate in the denser soils and the temperature of soil samples around the probe affects the temperature changes inside of the probes. Thus, the objective of this study was to develop the temperature transient probe and to propose that temperature compensation should be considered in order to obtain more accurate in-situ results.
Development of Noise-proof Facility Considered with Soundproofing Materials in a Tunnel Blasting
Jeoung, Jae-Hyeung ; Won, Yeon-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 27~35
This study investigated a sound reduction degree by each soundproofing materials and the sound pressure level of a main frequency range to develop soundproofing facilities installed for reducing sound in a tunnel blasting. The frequency range and sound pressure level of soundproofing materials(eg. sand and water etc.) mainly used at a working spot were measured using the experimental apparatus considered with blasting situation. The full scale pilot test was also carried out using developed soundproofing facilities in this study. And the performance of developed soundproofing facilities was analyzed. As a result, the developed soundproofing facilities using water in sound insulation materials could reduce about 10dB(A) of blasting noise in compare with the existing soundproofing facilities.
An Experimental Study on the Applicability of Precious Slag Ball as Vertical Drains
Kwon, Jeong-Geun ; Im, Jong-Chul ; Kim, Woo-Kyoung ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 37~46
To investigate the applicability of Precious Slag Ball as the alternative material such as vertical drains, it is necessary to check the drainage effect of it in the field construction. In order to attain an successful design it is important to predict problems encountered in field construction. Accordingly, in this study the laboratory tests were executed under different conditions before applying of the field. 4 cases including Precious Slag Ball, sand+Precious Slag Ball, pack Precious Slag Ball and sand as vertical drains were conducted, and under the base of the laboratory tests the field test was executed and analyzed. By the upper results it is apposite to use Precious Slag Ball as vertical drains.
A Study on Bounce Height and Impact Energy Considering Slope Height, Rockfall Weight Using Rockfall Program Considering Slope Height, Rockfall Weight
You, Byung-Ok ; Han, Won-Jun ; Lee, Sang-Duk ; Shim, Jea-Won ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 47~54
The rockfall protection fence installed to secure safety against rockfall occurring in cut slope has been designed under the condition with 50kJ of impact energy arising when the 400kgof rock block is falling from 12.5m height. However, in falling case of bigger rock block or from higher place, it is hard to be secure of safety with existing rockfall protection fence. Using the rockfall program, safety analysis for rockfall is conducted in this paper by changing slope height, separating distance from fence, and slope angle, according to rock block sizes. In the result of analysis, when a 400kg of rock block which is designed load is fallen, the existing rockfall protection fence with 2.5m height can secure most of rock fall except some cases for the slope having 20m or less hight, whereas for more than 20m height, the fallen rock is frequently splattered over the rockfall protection fence, as well as the impact energy of rockfall may exceed designed impact energy. Therefore, in the design of rock fence, it is considered appropriate to design that after conducting safety review for rockfall according to the ground conditions, evaluating the bounce height and impact energy of rock fall, and then installing appropriate rockfall protection fence would be applicable rather than just following standards based design drawing.
Study on the Rational Construction Method Using Analysis of the Case Study of PHC Pile Foundation in Song-Do Area
Lee, Byeng-Ho ; Lee, Jong-Hwi ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 55~61
Song-Do international city is the area developed in large-scale land reclamation. Song-Do area consists of reclamation layer, sedimentary layer(loose silt, soft clay and sand alternating) and residual layer from the ground surface. Therefore, using pile foundation is inevitable to build structures safely. In this area, driven PHC piles have been generally constructed in terms of environmental and economic conditions. As a result of analyzing 4 sites in Song-Do district 5 and 7 recently, the method of driving pile has many problems because of existence of rigid soil in sedimentary layer and installation of more than 30m piles. In this case, when installing piles by drive after pre-boring up to appropriate depth, the results of constructability analysis were very good. And in the economic efficiency, although 4% of construction cost rose, it was a very slight increase in comparison with improvement of workability. In the case of the stability, more than 70% compared to the allowable stress of piles was satisfied through the load test. As a result, when PHC piles is installed in Song-Do district, the proper construction method is that piles are located at bearing layer after boring rigid sand layer.
An Experimental Study for Relationship Between Gravity Water Content and Volumetric Water Content Through the Absorptance of Soils Particles
Lee, Hyoung-Kyu ; Lee, In ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 3, 2011, Pages 63~67
Recently, the application of unsaturated-soil theory is concerned in practice. Most characteristics of unsaturated-soil is the relationship between volumetric water contents and matric suction. Usually the volume water contents is estimated by the relationship between gravity water contents and volume water contents because of the difficulty of measurement of volumetric water contents. In this case, the water exists in only void of soil, and the relationship between gravity water contents and volume water contents is calculated by only water in void, but in fact, the water exists in the particle of the soil. So the real volume water contents is different with calculated volume water contents derived by the relationship containing only void water. The object of this research is to revise the relationship between volume water contents and gravity water contents by using the absorptivity tests of the soil particle.