摘要
佛子矿104号矿体经过多年浅孔留矿法开采,在矿体上部遗留了大量的采空区及矿柱;由于前期的无序处理,形成了复杂的空区赋存现状,对下部矿体的安全开采带来了严重威胁。为了科学地制定空区处理措施并回收矿柱,通过数值计算结合理论公式法对104矿柱稳定性进行对比分析,确定了各空区残留矿柱的安全系数;结合矿山现有技术条件,在综合考虑采空区安全处理及矿柱有效回采的基础上,提出了崩落充填相结合的处理方案;采用FLAC3D软件对拟定方案进行了数值模拟分析。计算结果表明:崩落充填相结合的处理方案通过强制崩落法与充填法相结合,使上部应力集中区围岩得到充分移动垮落,下部空区得到充实,达到崩柱放顶卸压、控制岩移的目的,能有效地消除空区隐患并回收矿柱,为矿山安全、经济、合理地处理采空区提供了指导。
After years of short-hole shrinkage mining at No. 104 ore-body in Fozi Mine,a lot of goafs and pillars have been left behind at the upper ore-body. Due to the disorder treatment in the early stage,goaf with complex situations was formed,which seriously threatened the safety mining of the lower ore-body. In order to produce a scientific goaf treatment measure and realize pillar recovery,the pillars stability of No. 104 ore-body is analyzed combining the numerical calculation with the theoretical method,and safety factors for remained pillars at each goaf are determined. On the basis of comprehensive analysis of goaf treatment and pillar stoping,and combining with the present technology,the integral scheme of caving and backfilling was proposed. Numerical simulation on the integral scheme by software FLAC3 Dshows that this scheme makes upper surrounding rock at stress concentration zone fully remove and collapse,and makes goaf filled to achieve the pressure relief and rock movement controlling by pillar and roof caving. This scheme can effectively eliminate the hidden trouble of goaf,and provide a guidence for the treatment of goaf in a safe,economic and reasonable way.
出处
《金属矿山》
CAS
北大核心
2015年第4期137-141,共5页
Metal Mine
基金
湖北省自然科学基金项目(编号:2014CFB814)
关键词
矿柱稳定性
采空区处理
数值模拟
Pillar stability
Goaf treatment
Numerical simulation
