采动影响下断层附近矿压显现规律的相似模拟试验研究

Similar Material Simulation Study on Strata Behavior Law near Fault Zone Under Mining Effect

为了研究采动影响下断层附近矿压显现规律,以曹村煤矿1010工作面的地质条件制作了两个相似材料试验模型,模拟工作面分别从断层下盘和上盘向断层推进研究了断层附近的矿压显现规律,研究结果显示:工作面由断层下盘向断层推进时,越靠近断层顶板稳定性越差,周期断裂步距小,当开采工作面在断层面位置时断层的正应力和剪应力达到最大值;当开采工作面从断层上盘向断层推进时,开采工作面顶板岩层断裂易于形成梁式结构,且断层滑移量相对保持不变;开采工作面经过断层后,断层的上下盘均发生显著运动,而主要以断层上盘沿断层面向下相对运动为主。

In order to study the strata behaviors around the fault under mining effect, two experimental models of similarmaterial were made, according to geological conditions of Caocun coal mine 1010 face. Respectively simulated theadvancement of working face from the foot wall and hanging wall to the fault, to study the strata behavior law at fault zone.The results show that, when working face advances from the fault footwall, the closer to the fault the worse is the roofstability of working face, the smaller is periodic breaks step, and normal stress and shear stress of fault plane reachesmaximum value when working face is at the fault layer; when working face advances from the fault hanging wall, roof rockfracture easily forms beam structure, and the amount of fault slip essentially remains unchanged; after passing the faults,the foot wall and hanging wall of the fault occur significant movement, which is mainly the hanging wall side down along thefault layer.