近距离煤层联合开采的通风阻力测试及围岩破坏规律研究

近年来，随着煤层开采深度的增加，深部的煤层组正在逐渐成为各煤矿的主产煤层。与单一煤层开采不同，由于部分煤层的厚度较小，且各煤层之间的间距也较小，因此多采用多煤层联合开采的方式布置。本研究通过对某矿井近距离煤层开采条件下的通风阻力参数的测试结果进行理论分析，确定该煤矿在工作面回风巷与上部已采封闭工作面存在严重漏风现象。通过数值模拟技术，对该矿地质条件下近距离煤层矿压规律进行数值分析，经分析发现近距离煤层应力互相影响造成的破坏区主要集中在巷道端头附近的位置，由于破坏区的存在必然会出现漏风现象，通过数值模拟所得到的结果与现场实测的情况相符。通过对围岩的破坏规律的分析，认识到近距离煤层开采时出现的问题，为类似地质条件下的安全生产提供了可靠地参考依据。

Ventilation Resistance Test of Joint Mining of Close Distance Coal Seams and Failure Rule of Surrounding Rock

In recent years，with increasing depth of coal mining，deep coal seam groups are gradually becoming the main producing seam in various coal mines.Differing from the single seam mining，more and more mining joint of coal seams are adopted due to low thickness in parts of coal seam and small space among each seam.Through the theoretical analysis on the test results of the ventilation resistance parameters under mining conditions of close distance coal seams in a mine，it is found that serious leakage phenomenon exists in the place between the airway and the upper closed work face.The numerical analysis on strata behavior regularity of close distance coal seams under the geological conditions indicates that the damage zones caused by the stress of close coal seams mainly concentrate near the end of roadway.The presence of the damage zone inevitably cause leakage phenomenon.The numerical analysis result conforms to that of the field test.Through the analysis on failure law of surrounding rock，that the problems appearing in mining of close distance coal seam is found out，provides a reliable reference for safe production of mines with similar geological conditions. Close-up|Ventilation resistance|Numerical analysis|Damage of surrounding rock