综采工作面过正断层期间的矿压规律
Strata Behavior at Fully-machanized Coal Face During Its Advancing Through Normal Faults
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摘要: 任家庄矿-680 m水平的11506综采工作面由F25正断层上盘向前推进，运用ABAQUS三维计算模型模拟工作面推进到断层附近时断层对工作面前方最大主应力和巷道表面位移的影响，理论分析在工作面向断层推进过程中，断层附近煤体上部岩层的特殊破断情况，同时进行现场实测。结果表明：11506工作面由正断层上盘向断层推进过程中，断层会影响靠近断层附近煤体的上覆岩层破断位置；当接近断层和正在穿过断层时，断层对工作面和巷道的压力最为剧烈，推过后会出现一定程度的卸压；位于上盘范围内的巷道顶底板位移比正常多10～20 cm；巷道帮部锚杆受力比平常大2～4 MPa。Abstract: The 11506 fully-mechanized coal face, located at the level of -680 m in Renjiazhuang Coal Mine, advances in the hanging side of the normal fault F25. This research adopts 3D calculation model, ABAQUS, to simulate the effect of faults on the maximum principal stress and roadway displacements ahead of the coal face when it approaches to the faults. In addition, the specific fractured conditions of the overlying strata near the faults are analyzed theoretically in conjunction with in-situ monitoring. The practices indicate that the positions where the overlying strata fracture can be interrupted by the fault as the 11506 coal face advances in the normal fault hanging side. This type of effect is especially severe when the coal face is near to or passing through the fault . In comparison to the normal condition, the roadway displacement near the fault is 10 to 20 cm higher and the stress in the rib bolts is 2 to 4 MPa greater.
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