This paper presented the failure model of some oblique slope consisting of silt mudstone,argillaceous sandstone and carbon shale interlayers,by virtue of analysis of the slope deformation charac-ter. According to engineering geological conditions and analysis of cracks,rock mass relaxation and beddingdisplacement in the slope,a conclusion was drawn that the deformation of the slope was mainly controlledby weak interlayers and steep unloading cracks dipping out of slope. Owing to tensile stress and shear stressconcentration at the middle and upper of the slope along the bedding displacement belt,and the compressivedeformation of soft layer at the bottom of slope,rock blocks deform out of slope or along dip direction ofbedding planes. And the deformation develops upwards along rock beds and unloading cracks,which results instep creeping and cracking deformation. Because it is cataclastic rock mass intensely weathered and stronglyoff-loaded with many weak interlayers downstream slope,the potential landslide may slide along the weak layers.So the control of the slope deformation should be concentrated on reduce-loading,together with pre-stressedcable framework to control the deformation of weak layers.
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