Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory |
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| Authors: | YU Wei-jian WANG Ping and DU Shao-hua |
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| Institution: | Hunan Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, P. R. China;School of Resource and Safety Engineering, Central South University, Changsha 410083, P. R. China;School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China,School of Resource and Safety Engineering, Central South University, Changsha 410083, P. R. China and School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China |
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| Abstract: | Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows: the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the third was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d. |
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| Keywords: | deep high stress broken-expansion surrounding rock deformation and failure of roadways gray correlation theory |
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