• Proceedings of the Korean Geotechical Society Conference
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• 1993.04a
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• pp.81-90
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• 1993

• Proceedings of the Korean Geotechical Society Conference
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• 1990.10a
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• pp.145-162
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• 1990

• Proceedings of the Korean Geotechical Society Conference
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• 1995.10a
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• pp.4001-4006
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• 1995

• Proceedings of the Korean Geotechical Society Conference
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• 1988.06b
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• pp.53-68
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• 1988

• Proceedings of the Korean Geotechical Society Conference
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• 1997.09a
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• pp.3-20
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• 1997

• Proceedings of the Korean Geotechical Society Conference
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• 2005.03a
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• pp.1233-1240
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• 2005

As the geotechnical technologies have grown, the size of civil structures has become bigger than before, thereby requiring large-scale geotechnical testing equipments which can evaluate the mechanical behavior of large size testing materials such as gravel, crushed rock and so on. These kind of large testing equipments are usually used to evaluate the mechanical characteristics of large size material which are applied in the large infra structures like dam, seashore structure, coastal landfill, soil-structure interaction and seismic response of large-scale structure. In this research, state-of-the-art information in the field of geotechnical engineering was collected and summarized for such large-scale experimental equipments as large-scale geo-centrifuge, large-scale triaxial testing machine, large-scale direct shear testing apparatus and large-scale oedometer.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09c
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• pp.37-46
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• 2010

Marine clays are soft soil deposits having complicated mineralogy and formation characteristics. Thus, characterization of its geotechnical behavior has been a main issue for geotechnical engineers. Nowadays, the importance and applications of geophysical exploration on marine clays are increasing significantly according to the accuracy, efficiency, and reliability of geophysical survey technology. For marine clays, seismic survey is effective for density and elasticity characterization, while electro-magnetic wave provides the information about the fluid conductivity phenomena inside soil. For practical applications, elastic wave technology can evaluate the consolidation state of natural marine clay layers and estimate important geotechnical engineering parameters of artificially reclaimed marine deposits. Electrical resistivity can provide geophysical characteristics such as particle cementation, pore geometry shape, and pore material phase condition. Furthermore, nondestructive geophysical monitoring is applicable for risk management and efficiency enhancement during natural methane gas extraction from gas hydrate-bearing sediments.

• Geomechanics and Engineering
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• v.29 no.5
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• pp.549-565
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• 2022

Severe acid rains can be a major source for geotechnical and environmental problems in any soil depending on the acid type and concentration. Hence, this study investigates the individual severe effects of sulfuric, hydrochloric and nitric acids on the geotechnical properties of real field soil through a series of experimental laboratory tests. The laboratory program consists of experimental tests such as consistency, compaction, unconfined compression, pH determination, electrical conductivity, total dissolved salts, total suspended solids, gypsum and carbonates contents. The experimental tests have been performed on the untreated soil and individual acid treated soil for acid concentrations range of 0% to 20% by weight. In addition, a unique hyperbolic mathematical model has been used to predict significant geotechnical characteristics for acid treated soil. The plastic and liquid limits and optimum moisture content have been increased under the effect of all the used acids whereas the maximum dry density and unconfined stress-strain behavior have been decreased with increasing the acid concentrations. Moreover, the used hyperbolic mathematical model has predicted all the geotechnical characteristics very well with a very high coefficient of determination (R²) value and lowest root mean square error (RMSE) estimate.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03b
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• pp.586-591
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• 2004

매년 발생되는 절토사면의 붕괴를 사전에 방지하기 위하여 절토사면에 상시 계측시스템을 설치하고 지반의 거동분석을 실시한다. 본 현장의 절토사면 붕괴 규모와 메카니즘을 분석하고 계측 결과와 상호 비교 분석한다. 본 현장은 상시계측시스템 운용 확대 실시에 따른 시험 설치 현장으로 2003년부터 운용 중에 있다. 계측결과에 의하면 강우량과 지반의 거동이 밀접한 관계가 있는 것으로 사료된다. 본 현장의 경우 크게 3번의 지반이동이 있었으며 현재는 안정화 단계에 있는 것으로 사료된다. 그러나, 향후 동절기의 외분 온도 변화와 동반하여 지반의 변동이 우려됨으로 인하여 지속적인 관찰과 자료 분석이 수행되어야 할 것으로 본다.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.1139-1146
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• 2009

Collapse of cut slope includes many uncertainties in view of the reason and time. So, in the past, risky cut slopes have been dealt after they've been collapsed through post-management measures. But recently, advanced disaster prevention system is required, and as a part of that RTMS(Real-Time Monitoring System) was developed. In this study, stability of risky cut slope was evaluated by site investigation. To grasp deformation behavior characteristics of slope, numerical analysis based on FEM was performed and using results of that, specific standards for installation of Real-Time Monitoring System were suggested.