• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2001.10a
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• pp.69-82
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• 2001

본 연구는 절리가 발달한 고속도로 절취 사면들의 안정성을 검토하기 위하여 수행되었다. 물성시험을 바탕으로 한 지질 강도지수(GSI)를 이용하여 절리가 발달한 암반에 대한 최적의 물성을 구하는 과정을 제시하였다. 안정성 검토를 위해 FLAC에 의한 수치해석을 실시하였으며 이 때 사용한 모델은 절리 발달 상태가 균일하게 분포하였으므로 Ubiquitous Joint Model을 선정하였다. 해석은 건기와 우기의 경우로 나누어 실시하였는데 조건에 따라 절리면의 강도를 달리 적용하였다. 본 논문은 굴착 사면에서 쉽게 접할 수 있는 절리암반 환경에서 최적의 물성을 결정하고 이를 이용하여 안정성을 분석할 패 하나의 참고자료로 활용할 수 있을 것이다.

• The Journal of Engineering Geology
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• v.12 no.3
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• pp.295-303
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• 2002

The stability of rock slopes is closely related to the factors such as: type of rock, development of geological structures, weathering, characteristics of rock, and the shape of the geological features. When we design the rock slope, the slope stability is determined by the discontinuity causing the circular, plane or wedge failure. The failure happens when the slope is under the unstable geological condition. But in some cases, slope failure has occurred even though the slope is under stable geological conditions. In this respect, this paper presents the plane failure conditions for domestic rock slopes through research of sites where slope failure has occurred regardless of whether or not it satisfied the stable geological conditions.

• Journal of the Korean GEO-environmental Society
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• v.9 no.5
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• pp.61-69
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• 2008

In general, it has been usually used the method that assess rock slope stability using stereographic projection method, limit equilibrium analysis, numerical analysis and slope stability evaluation table. Several methods for assessing the stability of rock slopes has been proposed on the basis of site investigation data. These method adopted different evaluation items and weighting factors by researchers, organization and nation. But the researches for each evaluation items were insufficient. So the effectiveness of rock slope stability evaluation items for geometrical configuration (slope height, slope direction and angle, dip and dip direction of major discontinuity, absolute value for the direction difference for slope and major discontinuities) and topographical characteristic (possibility of topographical water concentration, upper natural slope angle, slope configuration) using 315 failure and stable highway rock slope analysis data, AV (abnormal value) analysis and NMAV (normalized maximum abnormal value) analysis were evaluated.

• The Journal of Engineering Geology
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• v.27 no.3
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• pp.267-274
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• 2017

Behavior of rock mass depend on the mechanical properties of intact rock and geometrical property of discontinuity distributed in rock mass. In case of rock slope, particularly, location of slope failure surface and behavior after failure are changed due to discontinuities. In this study, two 3D slope stability analysis methods were developed for two different failure types which are circular failure and planar failure, considering that failure type of rock slope is dependent on scale of discontinuity which was then applied to real rock slope to review the applicability. In case of circular failure, stable condition was maintained in natural dry condition, which however became unstable when the moisture content of the surface was increased by rainfall. In case of planar failure, rock slope become more unstable comparing to dry condition which is attributable to decrease in friction angle of discontinuity surface due to rainfall. Viewing analysis result above, analysis method proved to have well incorporated the phenomenon occurred on real slope from the analysis result, demonstrating its applicability to reviewing the slope stability as well as to maintaining the slope.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2001.03a
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• pp.204-218
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• 2001

절토사면은 토층, 풍화토, 풍화암, 연암, 경암 등의 풍화도가 다른 물질로 구성되어 있어 지반구성 물질에 대한 공학적인 판단이 쉽지 않으며 시공 중 또는 후에 사면의 안정성 문제가 대두되고 있는 실정이다. 사면의 안정성 문제는 과거 30여 년 동안 고속도로의 많은 절토사면에서 경험되어 왔으며 현재에도 계속적으로 사면붕괴 및 복구를 경험하고 있으나 체계적인 관리 및 조사가 이루어지지 않고 있다. 따라서, 본 연구는 절토사면의 체계적인 관리체계의 구축과 효율적인 자료분석을 위하여 사면관리용 데이터베이스 프로그램을 개발하였다. 이들 관리프로그램을 활용한다면 국내에 분포하는 암반의 내적 요인들에 대한 지질 공학적인 특성을 파악할 수 있으며 지역에 따라 분포하는 암석종류, 지질시대 및 지질구조에 따라 붕괴유형 및 발생빈도 등을 분석함으로써 도로 및 주택단지의 개설시 예비적인 사면안정문제를 예견할 수 있을 것으로 판단된다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2005.03a
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• pp.193-216
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• 2005

• Tunnel and Underground Space
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• v.28 no.6
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• pp.569-583
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• 2018

The purpose of this study is to identify the collapse characteristics by analyzing various factors causing collapse based on field survey and existing data on rock slopes occurring in the construction of roads and industrial complexes in Gyeongsangnam - do area. In the case of the slope where the slope has been directly surveyed, the analysis of the collapse characteristics can be used for the prediction and prevention of slope failure through the continuous collection of the slope data, database construction, management and analysis. The evaluation items used in the collapse characteristics of slope were selected among the items that can be regarded as objective evaluation items among the overlapping factors by comparing the evaluation items frequently used for the evaluation of the existing slope stability among various factors. The type of destruction of the rock slope depends on the type of carcass of the bedrock, such as planar fracture, wedge fracture, onho fracture, and conduction fracture, which are different from each other. And the slope stability analysis should be performed accordingly.

• Tunnel and Underground Space
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• v.11 no.3
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• pp.270-278
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• 2001

Two numerical methods such as DEM and FDM were adopted to analysis of rock slope stability, of which dimensions are about 150 m(length), 58 m(height), 70°dip, in Halla limestone mine. For this rock slope stability analysis, strength reduction method was used to calculate the safety factor of slope through numerical method. To keep the rock slope safely, it is proposed to reduce the height of the rock slope from 58 m to 45 m and to reduce the angle of the slope from 70°to 55°, too.

• Tunnel and Underground Space
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• v.22 no.6
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• pp.393-402
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• 2012

A behavior of ridge-cut rock slope had been monitored by installing inclinometers and regional slope movement toward rear side of cut face was detected. To delineate the governing factors of slope behavior, especially backward slip of ridge-cut slope, petrographic characteristics of rock cores obtained from four drilled boreholes had been examined. BIPS images inside boreholes had been acquired and structural characteristics of slope rock had been studied. Mechanical properties of discontinuity planes distributed in the drilled core had been measured and the shear strength of coal seam imbedded-discontinuity planes also had been obtained by performing the direct shear test. Monitoring results of slope behavior had been analyzed by comprehensibly considering both the mechanical and structural characteristics of slope rock and coal seam-imbedded discontinuity planes, and the potential governance of coal seam and clay minerals embedded in the joint plane on the regional slope behavior has been also identified.

• Tunnel and Underground Space
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• v.22 no.3
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• pp.181-187
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• 2012

Many researches on disaster prevention using computer simulation methods can be performed to minimize the damage of property and to protect human life. Discontinuous deformation analysis (DDA) is a new computer simulation method to analyze the behavior of discontinuous rock masses. Since most rock slope problems are 3-dimensional in nature, 2-dimensional deformation analysis has limited application. In this study, the basic principles of 3-dimensional discontinuous deformation analysis are described. The newly developed 3-dimensional discontinuous deformation analysis method is proposed as the computer simulation method for discontinuous rock masses. Then, the failure behavior of rock slopes are simulated using 3-dimensional discontinuous deformation analysis. The simulation results are compared and examined with the failure behavior at the rock slopes. The results show the applicability of 3-dimensional discontinuous deformation analysis to analyze the deformation and failure mechanisms of rock slopes.