통계분석을 이용한 암반사면의 안정성 평가
Rock slope stability evaluation using statistical analysis
암반분류법 사면 통계분석;
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The study area covered with sedimentary rocks consist of shale and sandstone has a high potential of wedge failure as well as planar failure due to three joint sets and faults parallel to bedding planes. Because the failure potential depends upon the engineering properties of the discontinuities, a slope stability should be performed with correct values of the properties. In order to analyse the slope stability by considering the uncertainty involved in the discontinuities' properties for a selected road-cut slope, rock mass classification was performed by employing the Monte-Carlo simulation technique and also input parameters for a numerical analysis were determined by the Hoek-Brown failure criteria. Probability analyses for failure with the Barton model and the Mohr-Coulomb model were carried out and the results were compared with those of the deterministric approach. As the results the rock mass of slope is belong to SMR class 4, a poor grade, and the maximum displacement of 4.7cm was computed by a FEM analysis considering a dry condition of slope. Furthermore the results of probabilistic and deterministric analyses also showed unstable state on the planar failure. The slope was stable on the wedge failure with the deterministric technique, while it showed more than 5% of failure probability with the probabilistic approach.