Study On The Support Technique Of Large Cross-section And Soft Rock Roadway In Yangchangwan Coal Mine

It is one of the crucial technique problems to slove the large section roadway support in soft rock in mine construction and safety mining under the complex conditions.Ningdong Coal Region has 3500 sq.km and the coal resources reserve are thirty billion tons, which is percent of 87% of the Ningxia Hui Municipality and it is one of the thirteen one-hundred-million-grade-coal production-base of China. The geological environment and mining conditions are seriously complex in excavation disturbed zone. Yangchangwan Coal Mine is the first modern coal mine in Ningdong Coal Region,where rockmass joints and cracks were very developed, roadway excavation zone is large section and broken and soften, with maximal 21 sq.m. Under the effect of mining disturbanced, the dynamical occurrence of slough and large area collapse phenomenons seriously happened and threated to mine safety and production.The objection of the thesis mainly concerned to the large section roadway support and control application under the complex conditions of Yangchangwan Coal Mine.Firstly, the comprehensive analysis of the field engineering geological characteristics were finished. Then, the roadway cross- section characteristics and patterns of support according to the rock mechanic test, the physical mechanical and the intensity parameter of coal and strata rock are obtained Furthermore, applying similar simulation and numerical analysised of the deformation characteristics under the complex conditions of large section roadway were comprehensive analyzed and evaluated by terms of borehole watching the scene, loose circle, acoustic emission monitoring and other means analysis of the scope and extent of loose rock and breakdown, combined with roadway surface deformation, bolt mechanical test and a comprehensive monitoring of distribution of ahead abutment pressure, through the failure investigation, in-depth analysised of of large sections of soft rock roadway local characteristics of deformation and instability evolution under the complex conditions.Finalily, the support form and parameter for the roadway had determined ,and specific control measures, ensuring the security and stability of the roadway were proposed. The research had a certain significance for the support to large section soft rock roadway and its application. Also, it could provide a worthy of proof for rockmass stability control to similar coal mine.