下伏煤层开采对上覆巷道围岩应力的影响

The impact of underlying coal mining on surrounding rock stress in overlying roadway

为了掌握淮南矿业集团潘三矿17101(3)高抽巷下伏11-2槽煤开采前后高抽巷的应力状态,采用空心包体应力解除法对巷道在下伏煤层开采前后各做了6个点的地应力测量,并通过有限差分软件FLAC3D对该工程进行了数值模拟计算。结果表明,该区最大主应力大小为21.62 MPa,最大主应力方向接近水平方向,最大水平主应力是竖直应力的1.42倍左右,具有明显的构造应力特征。通过下伏煤层开挖实测地应力分析比较得知,最大水平主应力比开挖前减小了3%。

In order to grasp the stress state in surrounding rock in suction road 17101（3） of Pansan mine before and after underlying 11-2 coal mining, using the hollow inclusion stress release method, in-situ stress measurement were conducted at 6 points before and after mining underlying coal seam. And the engineering was simulated and calculated by finite difference software FLAC3D. The results show that the maximum principal stress of this aera is 21.62 Mpa, the maximum stress direction close to the horizontal direction, the maximum horizontal principal stress is about 1.42 times the vertical stress, has obvious characteristics of tectonic stress. Through the analysis of meas-ured ground stress during mining underlying seam, it was known that the maximum principal stress decreased by 3%compared with that before mining.