Shandong Energy Zibo Mining Group Co.,Ltd. Province and Ministry Joint National Key Lab Cultivation Base of Mine
Disaster Prevention and Control,Shandong University of Science and Technology

地应力是影响巷道围岩稳定性的重要因素,为得到济北矿区的地应力分布特征,在济北矿区选取了9个具有代表性的原岩应力测点,采用应力解除法对该矿区进行三维地应力测量。测试结果表明:济北矿区最大水平应力、最小水平应力和垂直应力均随深度增加呈线性增加,最大与最小水平应力比值为1.83~2.68,最大与最小应力之差较大,导致岩体内部剪应力增大;最大主应力方向近似NW-SE向,倾角近水平方向;矿区中西部的局部区域受褶曲影响,地应力近东西方向,最大水平应力为垂直应力的1.36~1.82倍,且构造应力对矿区西部区域的影响高于东部区域。基于地应力测量结果,可以合理布置济北矿区井下巷道,巷道掘进方向应为NW-SE向,并局部地点巷道应根据相应的测试结果进行调整。

A geostress influence was an important factor of the surrounding rock stability in the mine roadway. In order to have the geostress distribution features of Ji bei Mining Area,there were 9 typical in- situ stress measuring points selected in Jibei Mining Area and a stress release method was applied to a 3D geostress measurement conducted in Jibei Mining Area. The measuring results showed that a max horizontal stress,min horizontal stress and vertical stress in Jibei Mining Area increased linearly with the depth increase,a ratio of the max and min horizontal stresses was 1. 83 ~ 2. 68,the difference between the max and min stress was high and thus the internal shea r stress in the rock mass increased. The direction of the max major stress was close to NW- SE mainly and the inclination was close to the horizontal direction. Partial area at the middle west of the mining area was affected by the fold,the geostress was close in an east and west direction,the max horizontal stress was 1. 36 ~ 1. 82 times high er than the vertical stress. The structure stress was highly influenced to the west area of the mining area than the east area. Based on geostress measured results,the und erground mine roadway in Jibei Mining Area could be rationally made,the heading direction of the mine roadway should be in a NW- SE direction and the mine roadways in partial area should be adjusted according the measured results.

国家自然科学基金资助项目(51379116)；