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Abstract A typical deep roadway with large-scale soft surrounding rock is researched here to study the stability of surrounding rock in Pingdingshan coal mine. With the laboratory experiment，the complex geological condition in deep rock roadway was determined. Discrete element method was adopted to simulate the deformation and failure of surrounding rock. The failure mechanism of surrounding rock was revealed. Technologies of spray layer which resisted bending and cracking and floor heave control were proposed. The main reason for instability of soft surrounding rock in deep rock roadway is the lower rock strengthen and the high geostress. The tensile failure appeared at vault and two side-walls and in the middle of floor at first. Then，the shear failure appeared at spandrel and two base angles. The failure zone extended into the deep area until the roadway is instable. According to the in-situ monitor data，it is concluded that stress in anchor and cable tended to be stable after supporting for two months，as well as the horizontal convergence，vault subsidence and floor heave. It means that the supporting technology works and the stability of soft surrounding rock in deep rock roadway is controlled.
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Received: 16 April 2012
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2012, Vol. 31 
