矿井深部地质环境下地应力分布差异性研究
Study on Different of Ground Stress Distribution in Deep Geo-environment of Coal Mine
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摘要: 为研究深部地质环境下地应力分布差异性特征,以龙固矿软、硬岩地应力值及数值模拟结果为基础资料,分别讨论了埋深、岩性、构造等3个因素对其影响程度。研究结果表明:大部分软、硬岩地应力值均随埋深有逐渐增大趋势,且增大速率相差不大;岩性分析中,硬岩中的最大水平主应力明显大于软岩中的最大水平主应力,且硬岩中的3个主应力差值较大,而软岩相对较小。软岩将更早处于各向等压状态;断层破碎带中地应力出现应力释放现象,应力释放对最大水平主应力值影响较大,但对最小水平主应力的影响不大。而褶皱对地应力影响作用比断层明显,尤其是对最大水平主应力的影响较大。Abstract: To study the different distribution of ground stress under the deep geo-environment, based on the ground stress data of the hard and soft rock, and the results of numerical simulation, we discussed the effect of depth, lithology and structure on the ground stress. The results are as follows: most of the principle stress values of soft and hard rock have a trend of increasing, and the increasing rate is not much difference; the maximum horizontal principle stress of hard rock is higher than that of the soft rock, the difference of three principle stress bearing in hard rock is larger than that of soft rock, and the phenomenon of hydrostatic pressure state will appear in the soft rock; the stress relieving appears in fault fracture zone, and has a significant influence on the maximum horizontal principle stress. Comparing with the effect of fault, fold plays a more important role on the ground stress.
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