Research on Deformation and Failure Characteristics and Control Technology of Deep Large Cross Section Roadway
In order to solve the problem of significant deformation and difficult control of surrounding rock in deep large cross section roadways,taking the 43under06 auxiliary connecting roadway in Jining No.2 Coal Mine as the engineering background,the range of loose circle in the roadway surrounding rock is measured by drilling and peeping method.According to this,the deformation and failure characteristics and reasons of the roadway surrounding rock are analyzed,and an optimized support scheme is proposed.The feasibility of the optimized support scheme is verified through numerical simulation.The on-site industrial test results show that using the optimized support scheme,the maximum deformation amount of the roof,floor,and two sides of the roadway are 82 mm and 49 mm,respectively,and the layer separation amount of the roof and floor is 15.2 mm and 7.3 mm,respectively,both of which are smaller than the allowable deformation amount of the roadway.The surrounding rock control effect is good.
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