Districts Feature And Contributory Factors Of Asymmetrical Deform In Deep Roadway

According to deep roadway surrounding rock asymmetrical deformation phenomenon, through theory calculation, numerical simulation analysis and industrial experiment methods, divided the deep roadway asymmetric deformation features into six partitions, and analysed the affected factors of asymmetric deformation. Based on the available support scheme of XinJi-San coal mine -700m West Ⅳ-West Ⅴ coal panel exploration entry, optimization and improvement, eventually, recommended one support scheme. Main tasks are as follows:(1) in accordance to existing related research results, described the theory of asymmetric deformation in deep roadway researches, support scheme researches and numerical simulation of asymmetric deformation analysis and based on the above studies, targeted the research technical route;(2) selected different effect factors of roadway asymmetric deformation, established different level of the factors, simulated with orthogonal experiment, setup the total surface displacement maximum value of roadway surrounding rock, the maximum value of surface vertical displacement, the maximum value of surface level displacement and roadway section plastic proportion as study index, analyzed the indexes with R-analysis Variance-analysis and F-test respectively, and analyzed the asymmetric of three displacement indexes location distribution;(3) by partitioning the asymmetric deformation of deep roadway surrounding rock, simplified the partitions structure with the elastic mechanics, structural mechanics, validated the simplified mechanical model and thus obtained the partition structure mechanics parse;(4) simulated the XinJi-San coal mine-700m West Ⅳ-West Ⅴ coal panel exploration entry existing support scheme, simulated three common improved support schemes: change U-steel shed space interval, roadway floor anchorage and spray and closed U-steel shed anti-arch support schemes, eventually recommended the closed U-steel shed anti-arch support schemes.The research results provided a theoretical basis for roadway surrounding rock control in deep inclined stratum, and referenced for the other tunnel surrounding rock control of similar asymmetric deformation conditions.