Abstract：Rock slope stability is subject to the dominant joint group. The joint system of outcrop rock-mass is automatically recognized and categorized based on point cloud data captured by terrestrial laser scanner(TLS) and fuzzy clustering method(FCM). Geometric spatial information and spatial position of several major joint groups can then be acquired. In order to determine the dominant joint group which controls rock slope stability，stereo graphic projection is applied to disclose the spatial position relationship between each major joint group and slope surface. The potential slip surface and corresponding factor of safety can be calculated by using strength reduction finite element method. The analysis results demonstrate that the slip surface mainly goes along the direction of dominant joint and extends from bottom to top. Shear failure commonly takes place along the joint fissure at the lower part of rock slope，while tensile fracture often occurs at the top part of rock slope.
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2013, Vol. 32 
