近距离采空区下大断面巷道顶板稳定分析

近距离采空区下大断面巷道顶板受煤层开采和巷道掘进两次采掘扰动，为研究两次扰动对巷道顶板稳定性的影响，以任楼煤矿Ⅱ8224切眼巷道为工程背景，利用理论分析、数值模拟及现场实测的方法，对采空区卸荷影响深度和巷道采掘扰动特征进行分析。结果表明：采空区卸荷影响深度的理论计算结果、数值模拟计算结果与钻取岩芯分析结果三者一致，受卸荷影响范围内的岩层会向上隆起；采空区下大断面巷道顶板的下沉时间为14d，最大下沉速度仅为15 mm/d。得出结论：采空区卸荷对煤层底板的扰动破坏影响深度为5.2 m；受采空区卸荷影响，巷道顶板下沉时间、下沉速度和下沉量较小。

Disturbance analysis of roof in close coal seam and large section roadway mining

The roof of the large cross-section roadway under the close goaf area was disturbed by coal seam mining and roadway boring twice, In order to study this two influences, taking the II 8224 open-off cut roadway in Renlou Coal Mine as the engineering background, the influence depth of goaf unloading and the disturbance characteristics of roadway mining were analyzed by theoretical analysis, numerical simulation and field measurement. The results show that the theoretical calculation results and numerical simulation results of unloading depth in goaf are consistent with the analysis results of drilling core, and the rock strata within the scope of unloading influence will rise up. The subsidence time of large section roadway roof under goaf is 14 d, and the maximum subsidence velocity is only 15 mm/d. It is concluded that the influence depth of disturbance and failure of upper goaf unloading on floor rock is 5.2 m; under the influence of goaf unloading, the subsidence time, subsidence speed and subsidence amount of roadway roof are small.