多中段复杂残留矿柱回采方案数值模拟分析

Numerical simulation analysis of mining schemes for complex residual pillars in multiple intermediate sections

某矿山原采用分段空场法及浅孔留矿法进行采矿,经过多年的开采,井下4个中段采场已基本回采结束,形成大面积采空区以及高品位的矿柱。随着矿山资源禀赋条件的变化,这部分高品位矿柱资源回收有利于企业的可持续发展,可以极大提高企业的经济效益。通过综合分析残矿资源分布、开采技术条件、采空区分布及稳定性等条件,拟定采空区治理与矿柱回收方案,合并多个中段布置矿块对矿柱进行回采。并通过建立三维力学模型,数值计算验证方案的可行性,为矿山矿柱回收提供技术参考。

A mine used the sublevel open stope method and short-hole shrinkage method for mining,and after years of mining,the four underground middle stopes have basically completed mining,forming a large goaf area and high-grade ore columns.With the change of mine resource endowment conditions,the recovery of this part of high-grade ore column resources is conducive to the sustainable development of enterprises and can greatly improve the economic benefits of enterprises.By comprehensively analyzing the distribution of residual ore resources,mining technical conditions,goaf distribution and stability,this paper formulates the goaf treatment and ore column recovery scheme.And establish a three-dimensional mechanical model,verify the feasibility of the scheme through numerical calculation,and provide a technical reference for mine column recovery.