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红阳矿区主采8#,12#煤,最大开采深度已超过1 000 m,回采巷道掘进及工作面回采期间均发生过冲击动力灾害。为了研究灾害形成的原因及其控制技术,现场采用空芯包体应力解除法对矿区不同埋深的6个测点完成了地应力原位测量。结果表明:各测点均有2个主应力方向接近水平方向,另一主应力方向接近于垂直方向,最大水平主应力是垂向应力的平均1.395倍,地应力场以水平构造应力场为主;各测点垂向应力均略大于上覆岩层重量;分析了最大主应力、最小主应力、垂直主应力随深度的变化规律;实测最大主应力方向为NW-SE向,平均方位角NW47.9°,结合数值模拟结果,北三采区西侧工作面组为最大水平主应力峰值位置(岩爆发生区),而其他采区随着开采位置远离峰值区域应力水平相对降低,靠近断层或者断层交叉区则应力水平降低。
The main mining 8 #, 12 # coal in Hongyang mining area has the maximum mining depth of more than 1 000 m, and the impact dynamic disasters have occurred during the excavation of roadway and face mining. In order to study the cause of formation of disaster and its control technology, on-site measurement of in-situ stress was done at six measuring points with different burial depths in the mining area by using the stress relieving method of hollow core inclusions. The results show that there are two main stress directions close to the horizontal direction at each measuring point, the other main stress direction is close to the vertical direction, the maximum horizontal principal stress is 1.395 times of the vertical stress, and the ground stress field is dominated by the horizontal tectonic stress field ; The vertical stress at each measuring point is slightly larger than that of the overburden; the maximum principal stress, the minimum principal stress and the vertical principal stress with depth are analyzed. The maximum principal stress direction is NW-SE and the average azimuth NW47. 9 °. Combined with the numerical simulation results, the working face group on the west side of Beisan mining area is the peak position of the maximum horizontal principal stress (rockburst occurrence area), while the other mining areas are relatively lower in stress level as the mining location is far away from the peak area, close to faults or faults Cross-zone stress levels decrease.