下位特厚煤层回采巷道合理布置分析

近距离煤层群开采中,由于下位煤层受上位煤层采动影响致使煤层开采中呈现特殊的矿山压力显现.如何安全有效地布置下位煤层巷道不仅是确保工作面安全高效开采的关键,更是提高煤矿效益的核心.针对国投塔山煤矿上位煤层开采残留煤柱下特厚煤层回采巷道合理布置难题,本文采用理论分析、实验室试验及数值模拟等综合研究方法对下位煤层巷道合理布置位置进行分析,得到以下结论:通过力学测试得到巷道顶底板煤岩体物理力学参数,为理论分析及数值模拟提供了强有力的数据支持;通过理论分析及数值模拟计算,研究了残留煤柱载荷作用下底板煤岩体中的非均匀应力分布规律;通过分析下位煤层回采巷道合理布置方案,确定下位3—5号特厚煤层巷道布置采用内错距25m的方式为最佳布置方式.

Analysis of reasonable position layout of lower and large thickness coal seam

In the near distance multi coal seam mining,special underground pressure of the lower coal seam appears affected by the mining of upper coal seam.How to arrange the lower seam roadway safely and effectively is not only the key to ensure the safety and efficiency of the mining working face,but also the core of improving the benefits of coal mines.On the basis of the problem of large thickness coal seam mining gateway layout under the coal pillar of upper coal seam in Tashan coal mine,through theoretical analysis,laboratory tests and numerical simulation this paper studies the reasonable layout position of the lower coal seam and draws the following conclusions.Various physical and mechanical parameters of the rock mass of the roadway surrounding rocks are obtained by the mechanical tests providing powerful data support for the theoretical analysis and numerical simulation of the paper;Using the theory analysis and numerical simulation methods,we study the distribution law of the non-uniform stress in the coal and rock mass under residual coal pillar loading;Through the analysis of reasonable layout of the lower coal seam,the layout of the No.3-5 special thick coal seam is determined by the way of inner fault distance 25m.