巴愣矿井软岩大巷支护技术的分析.pdf

万方数据 Subject :Stydy on Supporting Technical of Soft Rock Main Roadway in Baleng Mine Specialty :SafetyEngineering Name :Zhang Jinhai (Signature) Instructor :Li Shugang (Signature) Zhang Yinzhong (Signature) ABSTRACT Mine soft rock supportingis always one of the major problemsin China's coal mine production and rock roadway incorrect not only caused losses each year, but also threat themine safety, especially the roadway, can lead to the production of low strength of surroundingrock andeasy expansion deformation with water in Baleng coal mine makeit hard to support, and study on this has an important significance in engineering practice. Relevent mechanical properties parameters and data of main stress in 8 thcoal mine of the first level were got by coring andlaboratory test. The direction of maximum horizontal principalstress was nearly eastwast with value of and the minimumvalue was minimumvertical principal stress had value of . Based on this, numerical model of soft rock main radaway in deep mine was constructed. Surroundingrock deformation andfailue characteristics of return roadway, taperoadway and track roadway was analyzed numerically to conclude that tensile failure damage and floor heaving of roadway deformation werethe main form. The deformation amount was respecitive 470mm, 608mm and 436mm; roof subsidence amount was , . Through theoretical and engineering analogy analysis, 4 kinds of supporting scheme were proposed: high strength bolt shotcreting+ shed+ bottom boltsupporting, high strength bolt shotcreting+ shed+ bottom anchor cable+ base anglebolt spporting, high strength bolt shotcreting+ shed+ bottom anchor cable+ base angle anchor cable supporting and high strength bolt shotcreting+ shed+ inverted ar