卧虎山矿二步矿房采场稳定性分析及应用

Stability Analysis of the Second Room Mining Stope in Wohushan Mine and Its Application

针对卧虎山铁矿选用上向水平分层充填法开采二步矿房时面临顶板片冒、生产能力低、支护工效低等难题,对原有采矿法进行优化,采用一、二步矿房交替上升式充填采矿法。根据其采场结构建立开采力学模型,通过力学模型分析,确定一步矿房的超前开采高度10 m和二步矿房悬顶高度15.4m。采用充填体强度计算理论,得到了充填体强度的理论设计值为2.5 MPa,为采场稳定性控制提供了依据。最后,运用FLAC3D有限元分析软件,建立三维数值模型,对优化方案进行了验证。结果表明:确定的采场结构参数合理可靠,实现了卧虎山铁矿安全高效的开采。

The upward horizontal cut-andfill stoping method was used to exploit the second room in Wohushan Mine,which caused the problems of roof fall,low production capacity and supporting efficiency.Therefore,through optimization on the original mining method,the alternate rooms ascending filling method was adopted.Based on the stope structure,mining mechanical models were established.By the analysis of mechanical models,the advanced mining height of the first room was determined by as m,and the height of hanging arch in the second room was 15.4m.The design strength of filling body was calculated as 2.5 MPa through the filling strength theory,which provided theoretical basis for the stability control.Finally,the FLAC3 Dfinite element software was used to built the three-dimensional numerical models and verify the prioritization scheme.The results showed that the structural parameters of stope were reasonable and reliable for safe and efficient mining in Wohushan Mine.