人工砼柱置换残留矿柱采场结构参数优化

Optimization of stope structure parameters in a mine using artificial concrete columns to replace residual pillars

为了安全经济地回收某矿山已充填采场中的残留矿柱,根据矿山特殊的地质条件和残矿资源赋存状况,提出人工砼柱置换残留矿柱的回采方案。运用三维有限元模拟软件MIDAS/GTS建立采矿模型,模拟采矿过程,分析在采矿作业扰动下不同结构参数采场顶板围岩、矿柱和人工砼柱的稳定性,结合经济因素对拟选的5组采场结构参数进行优化选择。研究结果表明,采场最大拉、压应力随人工砼柱尺寸的增大而减小;最大拉应力位于上盘围岩顶板中央,是影响采场整体稳定性的主要因素;模型4最大拉应力0.474 MPa,远小于其抗拉强度1.57 MPa,安全富裕系数大,经济合理。最终确定矿山置换残留矿柱的人工砼柱尺寸为3.5 m×3.5 m。

In order to safely and economically reclaim residual pillars in the filled stope of a mine, a stoping scheme using artificial concrete columns to replace residual pillars was put forward on the ba sis of the special geological conditions and residual ore resources occurrence state. The 3D FEM（fi nite element method） simulation software MIDAS/GTS was used to establish mining simulation mod els, simulate the mining process and analyze the stability of roof, pillars and artificial concrete col umns under different structure parameters on the effect of mining disturbance. The stope structure parameters among the optional 5 groups were optimized considering economic factors. The results show that the maximum tensile stress and compressive stress of the stope decrease with the increase of artificial concrete columns size, the maximum tensile stress is located in the center of roof, which is the main factor that affects the overall stability of the stope, the 4th model gets the maximum ten sile stress of O. 474 MPa, which is far less than the tensile strength of 1.57 MPa and with a larger safety factor. Finally, the artificial concrete columns size of 3.5 m ~ 3.5 m for replacing the residu al pillars is determined.