Control Technical Research On The Stability Of Wall Rock Under The Deep Close Continuous Roadway Passed By Working Face

Along with the current mining speed in Chinese coal mines, A growing number of mines will go into deep mining, the characteristics of high deformation, high ground pressureand difficulties in supporting are inevitable.Based on the track roadway and belt roadway at650level in the YaoQiao Coalmine, made a comprehensive research to the deep close continuous mining across two alleys, so make sure the stability of surrounding rock of double roadway during the mining.In this paper, the deep close continuous roadway influenced by overhead mining on the theoretical analysis and numerical simulation and field industrial test has been carried on the comprehensive research. On the foundation of influencing factor of the tunnel deformation and failure and the reinforcement mechanism of bolt-anchor of the deep continuous roadway influenced by overhead mining and the nonlinear large deformation geometry field theory, the thesis proposed reinforcement design across two alleys and obtained schemes of reinforc support in three different stages and two basic reinforcement designs on track roadway. Using numerical simulation software FLAC3D, two basic reinforcement designs proposed on track roadway were compared from the stress, the displacement and the stress of bolt-anchor.Then a reasonable supporting scheme obtained has carried on the field test. According to the result on observation of rock pressure of the surface displacement and the deep displacement and the stress of bolt-anchor and the relaxation-zone. The reinforcement effect of surrounding rock is obvious.The experimental results showed that the track roadway and belt roadway at650level in the YaoQiao Coalmine use schemes of reinforc support in three different stages and a reasonable basic reinforcement designs on track roadway, which can validly control rock deformation of two roadways when across the mining, and which can guarantee the stability of surrounding rock of roadway. The track roadway and belt roadway at650level were in a relatively stable state for a long time, whick provide a good guarantee for safe and efficient mining of the follow-up work face. Reinforcement of the deep close continuous roadways influenced by overhead mining in the similar geological conditions in future provide important reference value.