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以迄今为止查阅到的中国大陆金属矿区实测地应力数据为基础,经优化处理后最终采用165组数据,基本覆盖了我国大陆主要金属矿山分布地区.采用回归分析法给出了中国大陆金属矿区测量埋深范围内的地应力场特征,并尝试从地应力的角度对中国大陆金属矿区断层的稳定性进行了讨论.结果显示,中国大陆金属矿区垂直主应力、最大与最小水平主应力总体上随埋深呈线性增加;最大与最小水平主应力之差Δσ随埋深的增加有增大的趋势,但规律性不显著;最大水平主应力与垂直主应力之比K_(h,max)主要集中在1.00~2.50之间,最小水平主应力与垂直主应力之比K_(h,min)主要集中在0.50~1.50之间,平均水平主应力与垂直主应力之比Kh,av主要集中在1.00~2.00之间,随着埋深的增加,3个侧压系数的变化幅度逐渐减小,K_(h,max)趋向于1.83,K_(h,min)趋向于0.80,Kh,av趋向于1.31;最大与最小水平主应力之比与埋深没有显著的关系,主要集中在1.5~2.0之间,近似服从正态分布;断层在埋深小于500 m范围内有滑动的可能,埋深超过500 m时,逆断层有滑动的可能,走滑断层处于相对稳定状态.
Based on the measured geostress data of the metal mines in mainland China so far reviewed, 165 sets of data are finally adopted after optimization and basically cover the distribution areas of the major metal mines in China. The regression analysis method is used to measure the metal mines in the Chinese mainland Depth of field, and try to discuss the stability of the metal ores in the Chinese mainland from the perspective of geostress.The results show that the principal stress of the vertical principal stress, the maximum and the minimum of the metal ores in the Chinese mainland generally follow the The difference between the maximum and minimum horizontal principal stress, Δσ, tends to increase with the increase of the buried depth, but the regularity is not significant. The ratio of the maximum horizontal principal stress to the vertical principal stress, K_ (h, max), is mainly concentrated Between 1.00 and 2.50, the ratio of minimum horizontal principal stress to vertical principal stress K_ (h, min) mainly lies in the range of 0.50 ~ 1.50. The ratio of average principal stress to vertical principal stress Kh, av mainly lies in the range of 1.00 ~ 2.00, with the increase of burial depth, the variation range of three lateral pressure coefficients gradually decreases. K_ (h, max) tends to 1.83, K_ (h, min) tends to 0.80, Kh, av tends to 1.31; The maximum and minimum level of the main response Ratio is not significantly related to the depth of burial, mainly concentrated in the 1.5 ~ 2.0 between the approximate normal distribution; fault depth less than 500 m within the scope of the possible slip, buried depth of more than 500 m, the thrust fault slip It is possible that the strike-slip faults are relatively stable.