| With the increasing of coal mining, especially, the high yield and high efficiency technology is developed rapidly in recent years, coal reserves under good condition has nearly exhausted in a relatively short period. So, the steep coal seam mining has been paid more and more attention by mining industry. So far, the support of gateway in steep coal seam is mainly dominated by single or traditional support patterns, which has very worse effect and can not meet the requirements of safety in production. For this reason, research on characteristics of deformation-failure of surrounding rock and supporting technology of gateway in steep coal seam will be one of the major issues, which is urgently solved for china's coal mining industry.Through the analysis of the surrounding rock mechanics and broken rock zone of roadway in steep coal seam, the asymmetry of deformation-failure of roadway in steep coal seam is summarized, which presents the mutual rupture deformation characteristics with "bottom uplift, roof decline"and causes the bearing load to the supporting structure asymmetric. Therefore, the supporting structure of surrounding rock must be studied for the stability control. Based on the specific characteristics of support of roadway in steep coal seam, The bolt, steel mesh and anchor combined support under asymmetric loads is proposed, the purpose of controlling the stability of the surrounding rock of roadway is achieved by non-symmetrical layout and mutual performance couple between the bolt, steel mesh and anchor combined support.Taking the No.3964 roadway in Zhaojiaba coal mine of Sichuan Guangwang Group as study object, the bolt, steel mesh and anchor combined support is studied by the methods of numerical simulation, physical simulation and site test. The results show that the intense deformation of surrounding rock of roadway is controlled effectively and the safety of roadway is greatly improved by the support system. |
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