Large deformation mechanism and “stress relief-support reinforcement” synergetic control method of soft rock roadway in the footwall of deep normal fault

Abstract

The surrounding rock of the soft rock roadway is seriously deformed and damaged under the superposition of mining stress and fault tectonic stress. In this paper, taking the No. 232206 intake roadway in Meihuajing coal mine as the engineering background, the deformation and failure law of the surrounding rock of the roadway in different fault protection pillar widths are obtained by numerical simulation method. On this basis, the mechanical model of the roadway under the action of hanging wall overburden migration and fault slip in normal faults is established, and the energy-driven mechanism of large deformation of the surrounding rock of the roadway was revealed. The ratio T of the energy applying on anchoring surrounding rock to the resistant energy of anchoring surrounding rock as the criterion for the deformation of the roadway. Finally, it was calculated according to the actual working conditions on site, and the control method of “stress relief-support reinforcement” was used to support the roadway with the risk of large deformation. The on-site monitoring results show that the control effect of the surrounding rock of the roadway is obvious.

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