采场二步骤回采充填体稳定性分析研究

阿舍勒铜矿采用大直径深孔嗣后充填法二步骤回采工艺,矿房充填体作为二步骤采场回采时的围岩,其强度和稳定性关系到二步骤采场回采的安全和经济效益。本文以0 m中段北1 #采场为试验采场,采用多种理论计算方法对矿房充填体的稳定性进行了计算和分析,建立数值计算模型,基于Phase2软件从位移、应力及塑性区进行模拟计算分析,综合分析得出：矿房采场的设计充填强度能满足二步骤采场回采强度要求,试验采场开挖后,其两侧帮充填体整体位移量较小,最大主应力普遍小于充填体的极限抗压强度,塑性区分布范围有限,且拉伸破坏区域未出现大范围相互贯通,说明矿房充填体稳定性较好,二步骤开采出现充填体大范围垮塌、冒落的可能性小。

Study on Stability Analysis of Filling Body in Two Step Mining

The large diameter deep hole back filling method was used to expolit the second room in Ashele Copper Mine, As the surrounding rock of the filled body, the strength and stability of the filling body are related to the safety and economic benefits of the two-step mining. In this paper, a variety of theoretical calculation methods were used to calculate and analyze the stability of the filling body in the 0 m middle North 1 # mining room. The numerical calculation model was established, and the simulation were carried out from the displacement, stress and plastic zone based on Phase2 software. The comprehensive analysis shows that the designed filling strength of the mining filed were reasonable for the two-step mining. After the excavation of the test stope, the overall displacement of the filling body on both sides was small, and the maximum principal stress was generally less than the ultimate compressive strength. The distribution range of the plastic zone was limited, and the tensile failure area did not appear to be interconnected in a large range, indicating that the stability of the filling body was reliable and the possibility of large-scale collapse and caving of the filling body was small in the two-step mining.