• Journal of the Korean Geotechnical Society
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• v.28 no.5
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• pp.77-84
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• 2012

The engineering characteristics of natural sediments containing diatom microfossils have been investigated for their abnormal deformation and strength behavior for a few decades. The presence of disk or hollow shape diatoms causes low compressibility, high hydraulic conductivity, and high shear strength of sediments. Some of these unusual differences show the characteristic of diatom owing to the interlocking of large interparticle porosity and angular particles. This phenomenon implies the possible use of diatom as modification materials to change the engineering performance of soil mixtures. This paper describes the engineering characteristics of diatom-kaolin mixture to investigate the engineering properties of diatom modified soils using conventional geotechnical tests and elastic and electromagnetic wave propagation tests. Experimental test results show the performance improvement by increasing diatom contents and the performance degradation by the breakage of interlocking between diatom particles under high effective stress.

• Journal of the Korean Geosynthetics Society
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• v.12 no.1
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• pp.21-28
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• 2013

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 $Ca^{2+}$ might be a good index to predict the rate of ground improvement for clayey soils with lime addition.

• Proceedings of the Korean Geotechical Society Conference
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• 2007.09a
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• pp.147-159
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• 2007

단층의 공학적 의미와 분류방법을 살펴보고 토목구조물의 설계 및 시공을 위하여 조사단계에서 단층에 대한 분포 및 공학적 특성을 파악하기 위한 각종 물리탐사, 현장시험, 실내시험 사례를 검토하였다. 단층의 분포특성 조사 사례를 통하여 지표지질조사, 시추조사, 물리탐사 결과들의 상호 관계를 살펴보고, 단층 및 주변 상태에 따라 적정한 탐사 및 조사 방법을 검토하였다. 그리고 단층의 공학적 특성 평가를 위한 현장 및 실내시험 방법을 고찰하고, 단층의 점착력, 마찰각 등과 같은 물성치의 산정 사례들을 수집하여 분석하였다.

• Journal of the Korean Geosynthetics Society
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• v.15 no.4
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• pp.43-52
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• 2016

This paper presents the results of a engineering characteristic to the effect of drilling fluid with different mix designs for use in bore hole collapse prevention. The bore hole collapse prevention mechanism for the bentonite based drilling fluid was first discussed together with the effect of conditioning with different additives on engineering characteristics of bentonite based drilling fluid. As result, bentonite with polymer have a outstanding characteristics as compared to CMC Properties thickening effect In the case of sea water with attatulgite be superior to bentonite. Therefore, in this paper presented qualitative result on the performance of the drilling fluid depending on the water.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.15 no.2
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• pp.127-137
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• 2003

The researches on the construction of artificial coastal wetlands have been progressed in order to cope with the situation that the area of Korean tidal flat has been reduced due to several coastal developments This study, as a part of the project on construction of the artificial tidal flats, deals with the comparison of the geotechnical characteristics between natural tidal flat and artificial tidal flat, and is also focused on the stability analysis of tidal flats. Various laboratory tests were performed using disturbed and undisturbed samples, which were obtained from a sandy tidal flat in Korea. The stability of the sandy soils accumulated on the tidal flat was investigated by comparing the shear strength of soil evaluated from laboratory test with induced shear stress due to both current and wave action.

• Proceedings of the Korean Geotechical Society Conference
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• 1998.03a
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• pp.32-66
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• 1998

• The Journal of Engineering Geology
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• v.25 no.4
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• pp.547-555
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• 2015

This work investigated the geotechnical characteristics of an embankment constructed with a mixture of soil and waste lime. The waste lime was a by-product of the manufacture of Na₂CO₃ at a near by chemical factory in Incheon. Field measurements were take three years after construction, and included geotechnical tests such as field density measurement, plate loading testing, dynamic cone penetration testing, and field CBR measurement. The results indicate that the geotechnical characteristics of waste lime mixtures are suitable for embankment works.

• Journal of the Korean Geotechnical Society
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• v.17 no.6
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• pp.69-83
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• 2001

In order to make use of finished municipal landfill as a construction site, it is necessary to consider environmental and geotechnical aspects for the ground improvement and application of waste landfill. In environmental aspect, methods for management of landfill gas and leachate have to be established, and in geotechnical aspect, it is necessary to investigate available method for constructing structure foundation. In this study, the finished landfill was selected for pilot test. Investigation about the environmental characteristics of the waste landfill was performed to establish the methods far management of landfill gas according to monitoring the gas quantity and to investigate economical efficiency according to utilizing landfill gas. Investigation about cases of utilizing the waste landfill in Korea and abroad as construction site was performed and pilot tests were performed to analyze the improvement effects of methods such as dynamic compaction method and PG pile method available to waste landfill. The results of this study showed that economical profits could be gained by utilizing landfill gas and improved waste landfill, besides, dynamic compaction method was effective in case of improvement depth being shallow, and PG pile method was effective in case of improvement depth being deep.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.47-47
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• 2019

• Geotechnical Engineering
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• v.15 no.12
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• pp.19-33
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• 1999