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针对新城金矿软破介质下残矿回采巷道掘进难题,提出了一种跷跷板式支护造顶的残矿回采及巷道掘进方法,采用木立柱对工作面进行超前支护,并形成类似"跷跷板"的人工假顶受力结构,有效阻挡矿岩垮落.该巷道掘进方法具有结构简单,支护成本低,回采作业安全等优点.为进一步验证该残矿回采方法的安全性,运用弹性力学相关原理计算得到巷道顶板的最大下沉量为4.8 mm,说明该支护方式完全可以满足工程要求,是安全可行的.利用ANSYS数值模拟软件研究了残矿回采巷道断面宽度分别为1.6 m、1.8 m、2.0 m和2.2 m,高度分别为1.6 m、2.0 m、2.2 m和2.4 m情况下巷道两帮水平位移及顶板位移.结果表明:宽度为1.6~2.0 m,高度为1.6~2.0 m时的残矿回采巷道是稳定的.研究成果有力地保障了新城金矿软破介质中巷道掘进的安全.

Aimed at solving the excavation problem of roadways to extract residual ores in soft and fractured medium in Xincheng Gold Mine,a residual ore extraction and roadway excavation method using seesaw-like artificial roof for supporting is proposed in this paper,which applies wooden structures for advanced workface supporting,forming a stress-bearing structure that looks like a seesaw and can effectively prevent roof falling.The excavation method uses simple structures,has low supporting cost and is safe in extraction operations.To verify the safety of the residual ore extraction method,elastic mechanics principles are applied to calculate the maximum subsidence of the roadway roof,which is obtained to be 4.8 mm,indicating that the supporting method is safe and feasible and can easily meet the engineering requirements.ANSYS numerical simulation software is used to study the horizontal displacement of both sides of the roadway and the roof displacement when the roadway section width is 1.6 m,1.8 m,2.0 m,2.2 m and the height is 1.6 m,2.0 m,2.2 m and 2.4 m respectively.The results show that the roadway is stable when the width is 1.6-2.0 m and the height is 1.6-2.0 m.The research achievement effectively ensures safe roadway excavation operation in soft and fractured medium in Xincheng Gold Mine.