“三软”煤层上保护层开采覆岩裂隙演化规律研究

Overlying strata crack evolution law research on the “three soft” coal seam mining protective layer

针对目前对高应力区"三软"煤层上保护层开采覆岩采动裂隙演化规律研究不足的问题,采用相似模拟试验进行研究.通过相似模拟试验结果分析得出,在上保护层开采之后,被保护层的泄压程度达到80%,极限(最大)膨胀变形量接近12‰.结果表明,上保护层开采是"三软"煤层开采的有效防突措施.研究覆岩采动裂隙演化规律对于丰富软煤层保护层开采防突技术具有重要的理论指导意义.

According to the current area of high stress on the＂three soft＂coal seam mining overburden rock mining protective layer crack evolution research on the problem of insufficient,the paper makes a study of the similar simulation experiment.By similarity simulation experiment,it is concluded that after the protective layer on the mining degree,the protective layer pressure reaches 80%,and the limit expansion deformation near 12 ‰（maximum）.The results show that the protective layer on the mining is the＂three soft＂coal seam mining effective outburst prevention measures.The overburden rock mining fissure evolutionary law for the rich soft coal seam outburst prevention technique of protective layer mining has important theoretical guiding significance.