Abstract: The deformation and failure law of the high steep slope at open pit due to the fault was investigated by the simulation tests of similar material with Panzhihua Iron Mine as an example.In the tests, the stress sensors and close-range photogrammetry measurement were adopted to monitor the failure and stress-strain features.A systematic analysis was made on displacement and crack failure of surrounding rock to discover the basic deformation and failure law of the high steep slope.The intensity of fault is weakened by rainfall and burst, and the deformation and failure mainly occurred in upper and middle levels of the wedge formed by the faults.The modeling of similar materials which well discover the basic characteristics of rock mass deformation and failure of high-steep slopes due to the rainfall and burst is an effective solution for theoretical research.

Key words: High-steep slope, Fault, Deformation and failure, Model test