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为了探讨残煤复采区域松软破碎巷道合理的控制方法,以山西梅园许村煤业2#煤层集中轨道巷为研究对象,采用现场调查、数值模拟和理论分析方法,提出了“散体-块体”结构模型,探讨了残煤复采条件下巷道变形机理、围岩控制原则及支护参数,通过理论计算及工业试验对该支护进行了评价。研究结果表明:初次回采后再生顶板可近似为“散体-块体”结构模型;顶板块体易发生剪切滑移和脱落,表现为巷道顶底板易成为破坏失稳的关键部位,使两帮承受更大载荷而发生片帮破坏;巷道支护破坏的根本原因是支护体和围岩的强度和刚度不耦合。现场工业试验表明,在支护完成60d之后,巷道围岩的变形趋于稳定,两帮移近量最大为220mm,顶底板移进量最大为540mm。该支护方式有效地解决了残煤复采后松软破碎围岩巷道的支护问题。
In order to investigate the reasonable control method of soft crushing lane in the residual coal recovery area, taking the 2 # seam track concentrated in Xuhui Village, Meiyuan, Shanxi as the research object, this paper put forward the method of field investigation, numerical simulation and theoretical analysis, - block “structure model, the mechanism of roadway deformation, the principle of surrounding rock control and supporting parameters are discussed. The support is evaluated by theoretical calculation and industrial test. The results show that the regenerated roof can be approximated as a ”bulk-block" structural model after the initial recovery. The roof slab is prone to shear, slip and fall off. The performance of the top and bottom floor of the roadway tends to be the key site for failure and instability. So that the two to withstand greater load and the film to help damage; the root cause of roadway destruction is the support body and surrounding rock strength and stiffness are not coupled. The field test shows that the deformation of surrounding rock of the roadway tends to be stable after the completion of 60 days of support. The maximum displacement of the two supports is 220mm and the maximum displacement of top and bottom plates is 540mm. The supporting method effectively solves the problem of soft and broken surrounding rock roadway after residual coal reclamation.