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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geosynthetic Society
Journal Basic Information
Journal DOI :
Korean GeoSynthetics Society
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Volume & Issues
Volume 13, Issue 4 - Dec 2014
Volume 13, Issue 3 - Sep 2014
Volume 13, Issue 2 - Jun 2014
Volume 13, Issue 1 - Mar 2014
Selecting the target year
Design Improvement VE Case for Expansion of a Roadway over a Soft Soil
Kim, Tae-Hyung ; Kim, Kook-Han ; Choi, Young-Chu ; Lee, Sa-Ik ; Ruy, Ji-Hoon ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 1~9
DOI : 10.12814/jkgss.2014.13.1.001
Expansion of a roadway on a soft ground can cause settlement of the existing road during embankment construction due to the consolidation characteristics of the soft soil. Many problems related to construction and maintenance, such as deterioration of the surface, decreased safety, and decreased structural stability, could affect the existing road. This scenario is especially true if the roadway foundation is a deep thick soft ground. Therefore, engineers should carefully select a proper design based on the characteristics of the soil layer. In this study, the expansion of the second branch of the Namhae Expressway was selected as the target site because this expressway has been constructing on a soft soil layer approximately 50 m thick. The original design was reviewed, problems were discussed and alternative was proposed through value engineering job plan phases: investigation, speculation, evaluation, development and presentation. In addition, the proposed alternative was evaluated on cost, function and value improvement. Compared to the original design, the proposed alternative saved cost and improved the function and overall value.
Numerical Analysis on the Behavior of a Slope with Upward Drainable Soil Nails during Rainfall
Kim, Young-Nam ; Lee, Choul-Kyu ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 11~22
DOI : 10.12814/jkgss.2014.13.1.011
In this study, numerical analyses and model tests were conducted to figure out the behavior of a slope reinforced by upward drainable soil nails during rainfall. The model tests were carried out on both reinforced and unreinforced slopes. To verify the results of the tests, seepage analyses were performed and compared with the test results using a commercial program, SEEP/W. The results showed that the numerical analyses have in overall a good agreement with the experiments in the variations of ground water level and pore water pressure even though there is some time delay for the experiment before the changes in the ground water level and pore water pressure after rainfall are observed, while the numerical analyses not.
Application of Laser Distance Measurer to measure ground surface displacement in slopes
Cho, Yong-Chan ; Song, Young-Suk ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 23~31
DOI : 10.12814/jkgss.2014.13.1.023
In this study, the method to measure effectively the ground surface displacement of slope was proposed using the Laser Distance Measurer (LDM). Applying the proposed technique is more simple and easier than the complicated and high-priced instrument to measure the ground surface displacement. LDM is an instrument that the red laser aimed at the target and then the reflected laser used for calculating the distance. The advantages of LDM are easy operating method, high measurement precision and lower in price. To check the feasibility, the proposed method applied to the real site that the ground surface displacement of slope was occurred continuously. The ground surface displacements were occurred in various points of the natural and cut slopes located at the lower part of coal mine waste heap due to the load of waste heap. To measure directly the ground surface displacement in this site, 6 measurement sections and 26 measurement points were selected. As the result of the displacement measured by the proposed technique within a certain period time, the accumulative ground surface displacement could be measured as well as the velocity of displacement could be estimated. Also, the progress direction of ground surface displacement can be confirmed and predicted through the analysis of all measured result.
A Study on the Behavior of Buried Flexible Pipes with Soil Condition
Lee, Hyoung-Kyu ; Park, Joon-Seok ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 33~40
DOI : 10.12814/jkgss.2014.13.1.033
In general, pipes buried underground can be classified into either rigid or flexible pipe. Glass fiber reinforced thermosetting polymer plastic (GFRP) pipe can be considered as one of typical flexible pipes for which the soil-pipe structure interaction must be taked into account in the design. In this paper, we present the result of an investigation pertaining to the short-term and long-term behavior of buried GFRP pipe. The mechanical properties of the GFRP pipe produced in the domestic manufacturer are determined and the results are reported in this paper. In addition, Ring deflection is measured by the field tests and the finite element analysis. Also, the extrapolation using these techniques typically extends the trend from data gathered over a period of approximately 5,232 hours, to a prediction of the property at 50 years, which is the typical maximum extrapolation time. Therefore, it was investigated that the long-term ring deflection of GFRP pipe estimated by methods for Monod-type.
Dynamic Characteristics of Decomposed Granite Soils by Changing Geoenvironment
Lee, Jin-Soo ; Lee, Kang-Il ; Kim, Kyung-Jin ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 41~52
DOI : 10.12814/jkgss.2014.13.1.041
Decomposed granite soil is likely to lose its strength when exposed to air or water. Such a geomaterial is weathered by wetting-drying or freezing-melting. In this study, resonant column tests were conducted to figure out the dynamic characteristics of granite soil that has affected by environmental changes like weathering condition. The results show that wetting-drying weathering condition is the most affective parameter on the dynamic characteristics of granite soil. In the meantime, artificial weathering conditions such as freezing-melting has less affection at first and getting increase as the process repeats constantly.
Evaluation on Bearing Capacity of Dredging Ground by Field Loading Test
Park, Jong-Beom ; Ju, Jae-Woo ; Kim, Jang-Heung ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 53~61
DOI : 10.12814/jkgss.2014.13.1.053
Sea gives us a lot of benefits and one of them is a role of transporting goods easily by ship. Accordingly the industrial area or the container yard is constructed either on the low sea or near the sea. Sea dredging ground is made by pumping them using dredge pump to the inside of embankment after dredging undersea soils. The dredging ground after pumping is in the slurry state but as time goes, consolidation by the own weight happens and evaporation happens at the surface of dredging ground. The evaporation causes the crest layer in the upper side of dredging ground. Under the crest layer there is still a soil of slurry state which has just little bearing resistance. This kind of characteristics makes it difficult to get a exact bearing capacity using the equations proposed until now. In this study we have performed simultaneously both the field loading tests and the cone penetration tests on the sea dredging ground. From the result of field tests, new experimental equation for the ultimate bearing capacity has been proposed. If we use the new equation, it is believed that some design of sea dredging ground could be more accurate.
A Study on Effects of Rainfall on Contamination at Stream Around the Developed Quarry
Lee, Yang-Kyu ; Han, Jung-Geun ; Hong, Kikwon ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 63~70
DOI : 10.12814/jkgss.2014.13.1.063
This paper describes the influence of rainfall on contamination at stream around the developed quarry. The investigation results are analyzed to evaluate the relationship rainfall and heavy metals (or water pollution). In the relationship rainfall and heavy metals, the result showed that the heavy metal contaminations are caused by boulder stone, waste residue and stone sludge, which is reacted with the direct contamination source, in the burried layer. It also found that the water flow change of stream according to the rainfall increase affected the large effect to a contamination level of heavy metal. the water pollution was increased by time changed from the rainy season to the dry season. That is, a lot of suspended solids had been discharge from the developed quarry due to rainfall increase, and then pollution level of water increases as the undercurrent of suspended solids is generated in stream due to rainfall decrease. Therefore, it analyzed that continuous causes of heavy metal contamination and water pollution in stream are materials in the burried layer and a discharge of pollution source from the developed quarry due to rainfall.
A Study on the Breakwater Characteristics considering Seismic Magnitude
Jeong, Jin-Ho ; Lee, Kwang-Yeol ; Lim, Chang-Kyu ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 71~83
DOI : 10.12814/jkgss.2014.13.1.071
Busan is located at the mouth of Nakdong River and if an earthquake occurs, it is very likely that the damage by the earthquake will be worse as liquefaction can happen in the sand layer, builtup soil, and landfill ground due to amplification in the lower sedimentary layer that is well developed in the river mouth. Therefore, this study first examined the possibility of liquefaction in the replaced sand layer under breakwater using 14 earthquakes in 5.6-7.9 scale and artificial earthquakes including the seismic wave suggested in the standard specifications for seismic design of ports and fishing port facilities to evaluate the stability of breakwater which is the primary protective structure for port facilities against earthquakes. Second, analysis on characteristics of the seismic energy and acceleration response spectrum by size of earthquake was performed to suggest the most appropriate size of seismic wave for the condition in Korea. Third, finite element analysis was performed using the suggested seismic wave to study the characteristics of earthquake by finding the dynamic lateral displacement of breakwater and verifying the stability of structure and the displacement and forces occurring at geotextile. Results of the study showed that the possibility of liquefaction in the landfill and replaced sand layer, the dynamic lateral displacement of breakwater, and changes of geotextile are greatly affected by the subsurface ground (replaced sand layer).
Case study on Construction and Improvement of Rahmen Structures in Deep Soft Clay Deposit
Lee, Sa-Ik ; Choi, Young-Chul ; Yoo, Sang-Ho ; Kim, Tae-Hyung ; Kim, Sung-Ryul ;
Journal of the Korean Geosynthetic Society, volume 13, issue 1, 2014, Pages 85~92
DOI : 10.12814/jkgss.2014.13.1.085
Structures that have constructed in soft clay might suffer from many issues related to consolidation settlement or lateral movement of soft-clay during long-term period. Therefore, it is important to establish proper design and construction processes related to site investigation, soil improvement, construction management, and so on. This case study focused on the construction of the rahmen structure supported by pile foundations. Especially, the structure in this case had been constructed without improving underlying soft clay and before constructing backfill embankment due to the limited construction time and the traffic connection of the old road crossing new highway. Therefore, in order to satisfy the structural stability, the construction processes and countermeasure methods were carefully planned based on the results of preliminary numerical analyses and monitoring of ground behaviors. Through the trial and error precess during the construction, the structures had been successfully constructed.