开采上下保护层卸压效果的数值模拟分析

Numerical Simulation of Pressure Relief Effect in Mining Upper and Lower Protective Coal-seam

摘要: 为了确定在冲击地压矿井中如何选择保护层进行开采,采用了FLAC^3D软件对不同煤层条件进行了保护层的模拟开采,分析了保护层开采后的应力分布以及所受层间距和上下位置关系的影响情况。模拟结果表明,层间距越大,卸压范围越小,卸压程度也越弱,同时在保护层开采的边界位置还存在应力增高的现象。通过对开采上下保护层的模拟分析发现,开采下保护层时,其卸压范围和卸压效果要优于开采上保护层。研究所得成果可以为冲击地压矿井如何合理有效地顺序开采提供依据,以降低或避免冲击地压事故的发生。

Abstract: In order to determine how to select protective seam in mine with rock-burst danger,applying FLAC^3D to simulating protective seam mining under different conditions.Stress distribution and the influence of interval between 2 coal-seams and relative position was analyzed.Simulation results showed that interval was larger,pressure relief range was smaller and pressure relief degree was weaker,stress rose at boundary of protective seam mining.Stress relief range and effect mining of mining bottom protective seam was better than that of mining upper protective seam.This might provide reference for selecting mining sequence to reduce or avoid rock-burst danger.