含断层覆岩采动裂隙演化规律

Evolution Laws of Mining Fissures of Overlying Strata Containing Fault

卸压瓦斯抽采与覆岩裂隙变化规律紧密相关。采用相似模拟试验对贵州某煤矿含断层覆岩移动规律、裂隙分布规律以及形态特征进行分析,研究含断层覆岩裂隙场演化规律。试验结果表明,随工作面的推进覆岩裂隙经历了产生、发展、闭合过程,在顶板断层附近裂隙显著增多,其裂隙密度曲线呈"山"字形分布;采动裂隙场的发育高度受关键层和断层带影响明显。

The pressure relief gas extraction is closely related to the evolution laws of mining fissure in overlying strata. We use similar simulation experiment to analyze movement laws of overlying strata containing fault, distribution laws of fissures and morphological characteristics in a coal mine of Guizhou province. The results show that the fissures in overlying strata experience the process of generation, development, close with the advancing of working face; fractures increase significantly near the roof fault and the fracture density curve is ＂Mountain＂type distribution. The height of fissure is obviously affected by key stratum and roof fault.