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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
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Journal DOI :
Korean Geo-Environmental Society
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Volume & Issues
Volume 6, Issue 4 - Dec 2005
Volume 6, Issue 3 - Sep 2005
Volume 6, Issue 2 - Jun 2005
Volume 6, Issue 1 - Mar 2005
Selecting the target year
A Study on the Sample Characteristics Obtained from Large Diameter Sampler and Piston Sampler
Kim, Young-Chin ; Kang, Jae-Mo ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 5~15
A large diameter sampler that can take undisturbed samples from soft ground was developed by KICT. In order to compare the quality of samples taken by the sampler with those of the traditional piston sampler, a series of laboratory tests were performed. Samples were taken at different sites such as Incheon, Gimhae, Yangsan and Busan. The results showed that the values of unconfined compression strength, secant modulus, pre-consolidation pressure, undrained shear strength, and shear modulus exhibited higher in samples taken by the large scale sampler. Strains at shear failure and volumetric strains were low for the new sampler. It was proved from the comparison that better quality samples could be obtained by the KICT sampler.
The Engineering and Environmental Properties of Reclaimed Concrete Materials as Road Materials
Lee, Yong-Soo ; Kwan, Yong-Wan ; Hyun, Jae-Hyuk ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 17~23
In Korea, the production of reclaimed concrete materials has been increased due to the increase in the concrete structures taken down every year. The reclaimed concrete materials have been reused as road materials. However, the studies on their mechanical and environmental properties have been very limited. The recycled rate of the materials is currently low in Korea. This paper presents the investigation of mechanical and environmental properties of the reclaimed concrete materials, as well as the comparisons with those of gravel. For the evaluation of the mechanical and environmental characteristics, following tests were conducted on both reclamed materials and gravel; liquid limit, plasticity index, CBR, sand equivalent test, abrasion test, pH test, and column leaching test. The test results showed that the reclaimed concretes satisfy the requirements for use as roadbase, subbase, and subgrade materials, except base materials. The pH of reclaimed concrete materials was less than 11 and the leaching test results satisfied the regulatory requirement of Waste Management Act in Korea. Based on the investigations, it appears that the reclaimed concrete materials are environmentally safe and applicable for use as road materials.
A Study on the Modified N-value by the Comparison Plate Load Test with Calculated Settlement
Ahn, Chang-Yoon ; Kim, Won-Cheul ; Hwang, Young-Cheol ; Nam, Hyun-Woo ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 25~34
The governing design point of shallow foundation is not its bearing capacity but its settlemen and N-value by the SPT is one of the key parameters for settlement estimation. However, if the N-value is more than 50/30, such as 50/10 or 50/20, the N-vlaues are not blow count of 30cm depth penetration. In these cases, the estimated settlements have big difference with the measured values because the applied maximum N value for the settlement estimation is 50. Therefore, in this study, the modified method for N-value estimation is suggested. The settlements by four methods, which are based on Elastic Theory with application of modified N-value, are compared with the Origina Plate Load Test data. The same comparision was carried out with another seven Empirical Methods. The result of this study showed that the error range of settlement is decreased from 260.4~2136.5% to 20.3~272.7%. Among four methods which are based on Elastic Theory, the original method by Elastic Theory is the most accurate with the application of modified N-value. Among Empirical Methods, Terzaghi-Peck's(1948, 1967) modified method 1 is the most accurate with the application of modified N-value. The differences between the original method by Elastic Theory and Terzaghi-Peck's(1948, 1967) modified method 1 are neglectable.
Development and Performance Evaluation of the Expanded Metal Rockfall Protection Fence
Hwang, Young-Cheol ; Kim, Bum-Joo ; Noh, Heung-Jae ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 35~45
The rockfall protection fence is one of the most common rockfall protection methods in Korea. The typical rockfall protection fence consists mainly of three parts ; H-beam supports, wire meshes, and wire ropes. The design of the rockfall protection fence is made such that the total energy absorbing capacity of the fence. Therefore, resulting from the combined energy absorbing capacity of the three parts is larger than the falling energy of rocks. In present study, a new rockfall protection fence, constructed using expanded metals instead of the existing wire rope and wire mesh for the typical type of rockfall protection fence, was evaluated on its performance by conducting both laboratory and field tests. Also, for a comparison, the same tests were performed on the typical rockfall protection fence. The test results revealed that the expanded material is an economic alternative to the existing protection materials and the expanded metal rockfall protection fence exhibits the higher energy absorbing capacity compared to that of the typical rockfall protection fence.
Evaluation of Point Bearing Capacity using Field Model Pile Test
Lee, Chang-Ho ; Lee, Woo-Jin ; Jeong, Hun-Jun ; Han, Shin-In ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 47~54
In many practical cases, design methods of pile have been used mainly semi empirical bearing capacity equations. It can be done that confirmation of pile bearing capacities through using of dynamic and static tests during constructing or after constructions. If a prediction of layered point pile bearing capacity could be done through simple tests during field investigation, it could be done that more reliable design of pile than a prediction of using semi empirical equations or static formulations. This paper suggests a method to estimated point bearing capacity during in-situ investigation by using the dynamic rod model pile and verifies the point bearing capacity compare with results of static pile load tests. From test results, the unit ultimate point bearing capacities are relatively similar through a dynamic rod model pile tests and static pile load tests. The unit ultimate point bearing capacity by using N value is shown about 50 % value of measured unit ultimate point bearing capacity from field test result and the prediction of the unit ultimate point bearing capacity by using N value is shown very conservative, illogical and uneconomical pile designs.
Estimation of Depth of Improvement by Dynamic Compaction with Soil Conditions
Lee, Bong-Jik ; Youn, Jun-Sik ; Lee, Jong-Kyu ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 55~61
Dynamic compaction is a ground improvement technique which is particularly effective for loose granular soils. It has also been used successfully to the cohesive soils with high void ratio, and wastes and fills. For the design of dynamic compaction method, prediction of depth of improvement is very important. The depth of improvement is influenced not only by compaction energy but also by many parameters such as grid spacing, soil property, degree of saturation and site conditions. Based on the test results, the depth of improvement were evaluated with considering compaction energy, soil type and ground water level.
A Study on the Environmentally Friendly Block
Han, Woon-Woo ; Lee, Kee-Se ; Ahn, Tae-Bong ;
Journal of the Korean Geoenvironmental Society , volume 6, issue 3, 2005, Pages 63~72
The characteristics of environmentally friendly block, roughness, erosion, stability and dissolved oxygen(DO) were investigated by hydraulic experiment. It was found that the roughness of A-block was lower than I block and A block was more stable to the variation of flow. So it is expected that A-block will be more effective to the channel flow. It was also found that the erosion of channel bed was very small or rarely occurred and stable in the case of 3-dimensional A-block filled with sand. And 3-dimensional A-blocks assembled with A-blocks were more stable against the flow force than I block because of the united force of A-blocks. When the bed of channel was paved with 3-dimensional A-blocks, DO was increased higher than I block. So it is expected that A-block will be more advantageous to underwater environment than I block.