阶段矿柱分条回采采场稳定性数值模拟与参数优化

本文针对水平厚长较大的阶段矿柱采用上向分层分条回采的采场布置特点,应用岩石破裂过程分析方法,建立起分条回采工作面顶板力学状态数学模型,分别计算了分条沿走向和垂直走向两种布置方式对顶板稳定性的影响,得出了对应各不同分条跨度的最小护顶层厚度。利用该方法的计算结果,对采场回采分条的布置方式、分条跨度、分条长度的控制,护顶矿层安全厚度的确定,提供了较好的理论依据,对阶段矿柱的回采具有指导意义。

Numerical Simulation and Parameter Optimization of the Stability for the Crown Pillar-drawing Stope

In this paper,according to the stope layout characteristic,the upward slicing and cutting is exploited in the thick horizontal crown pillar,we build a mechanical mathematical model for the ceiling of cuts stoping working face using rock fracture process analysis(RFPA)method,and calculate the influence of the layout of cuts along the striking trend and vertical trend to the stability of ceiling respectively,thus we obtain the minimum thickness of the ceiling corresponding to the different spans of cuts.The result of this method is utilized as a better theoretical basis for the layout of the stoping cuts,the control of the span and the length of cuts,as well as the determination of the safe thickness of top-safeguarding layer.It has a guiding significance to the stoping of crown pillar.