二次动压巷道变形机理与控制技术研究

Deformation Mechanism and Control Technology of Roadway With Two-time Kinetic Pressure

为有效解决五阳煤矿瓦斯抽采巷受开挖及采动影响变形较大的难题,现场分析了3#煤层裂隙发育特征及围岩物理性质,同时采用UDEC4.0软件模拟研究了该动压巷道变形机理及破坏特征,并对巷道顶底板变形率、两帮变形率及断面闭合率进行了系统性统计,最终确定底鼓是引起巷道破坏变形的最主要原因。在原有支护的基础上,优化了支护参数,提出了采用两帮加固+底板高预应力管缝式让压锚杆补强的巷道支护形式,并对支护效果进行了数值分析。现场试验结果表明:在采用该优化方案后,巷道顶板及两帮移近量分别降低了58.5%和60.7%,巷道底板最大相对移近量为198 mm,是加固前的34.2%,有效控制了该动压巷道受二次动压影响下围岩的破坏变形,为矿山高瓦斯治理及安全高效回采奠定了基础。

In order to solve the difficulty of heavy deformation about tendency high level suction roadway of Wuyang coal mines with two-time kinetic pressure,the characteristics of fracture development of 3#coal seam,and the physical property of surrounding rock are analyzed,and the deformation mechanism and failure characteristic of surrounding rock at the dynamic pressurized roadway are investigated through using UDEC4. 0 software. Then,the roof and bottom deformation rate,two working slope deformation rate and cross section of closing rate are counted,finally determining that floor heave is the most important reason for surrounding rock deformation. Based on the original supporting scheme,the support parameter is optimized,proposing one reinforcement scheme with two working slope reinforcement ＋ bottom high pre-stress slit wedge tubing yielding anchors supplement reinforcement. Its supporting effect is numerically analyzed. The field experiment data showed： by using this optimized scheme,movement of roadway roof and two sides were reduced by 58. 5% and 60. 7%,the maximum floor heave quantity is 198 mm,which is 34. 2% of the original roadway deformation. Therefore,the supporting method can control deformation of dynamic pressurized roadway with two-times kinetic pressure,and lay a foundation for controlling mine gas and ensuring safety and efficiency in mining.