多次卸压开采围岩变形与裂隙演化试验研究

Experimental Study on Surrounding Rock Deformation and Fracture Evolution under Multiple Relieving Mining

为研究煤层群多次卸压开采覆岩变形、破坏和运移规律,以潘二矿A3煤和B6煤开采为工程背景,建立A3煤下保护层开采和B6煤上保护层开采的物理模拟试验模型,基于相似模拟结果获得了上行卸压开采(A3煤)围岩变形、破坏特征,及在此基础上的下行卸压开采(B6煤)围岩力学特征。研究表明:上行卸压开采(A3煤)对B4煤影响较小,在A3煤开采基础上开采B6煤,取得了良好的卸压效果,为B4煤的高效开采提供了安全保障。

In order to research the deformation, failure and movement laws of overlying strata of multiple relieving mining in coal seam groups, the physical simulation models of the A3 coal seam using ascending relieving mining method and the B6 coal seam using descending relieving mining method were established in Pan＇er mine. The deformation and failure characteristics of surrounding rock in ascending relieving mining （A3 coal seam） were obtained, as Well as the mechanical characteristics of sur- rounding rock in descending relieving mining（B6 coal seam）. The research results show that the ascending relieving mining of the A3 coal seam had little impact on/34 coal seam. The excavation of B6 coal seam based on the A3 coal seam mining has been tested to achieve good relieving effect and guaranteed the efficient mining of the B4 coal seam.