采动裂隙椭抛带时效诱导作用及卸压瓦斯抽采技术

Aging induced effect of elliptic paraboloid zone in mining cracks and pressure released gas drainage technique

为了研究在不同推进速度下覆岩裂隙的动态演化规律及形态特征,开展了物理相似模拟试验及理论分析研究。研究结果表明:随着工作面推进速度的增加,覆岩裂隙发育高度会逐渐减小,同时,压实区的范围会相对增大,主要表现为压实区宽度会随推进速度的增加而增加,即卸压瓦斯运移优势通道的范围随推进速度的增加而减小。在试验结果分析的基础上,建立了考虑推进速度影响的采动裂隙椭抛带数学表达方程,并对试验矿井综采工作面高位瓦斯抽采巷布置层位进行设计,现场试验结果验证了依据工作面推进速度设计的高抽巷层位的合理性,从而为高强度推进工作面卸压瓦斯抽采系统的布置及参数优化提供了一定的理论依据。

The physical similar simulation test and theoretical analysis were applied to study the dynamic evolution law and the morphological features of the cracks in the overburden strata under the different advancing speed. The study results showed that with the advancing speed of the coal mining face increased,the development height of the cracks in the overburden strata would be steadily decreased. Meanwhile,the scope of the compacted area would be relatively increased. Mainly the width of the compacted area would be increased with the advancing speed increased. Thus,the scope of the pressure released gas migration dominant channel would be decreased with the advancing speed increased. Based on the analysis on the test results,a mathematical expression equation of the mining crack elliptic paraboloid zone was established in consideration of the advance speed. A design was conducted on the layout layer of the high level gas drainage gateway in the fully mechanized coal mining face in a trial mine. The site test results approved the rationality of the high level gas drainage gateway according to the designed advancing speed of the coal mining face. Therefore,the certain theoretical basis could be provided to the layout and parameter optimization of the pressure released gas drainage system in the coal mining face with a high intensity advancing speed.