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Distribution laws of in-situ stress in deep underground coal mines

机译：深层地下煤矿原位应力分配规律

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摘要

With depth and intensity of coal mining increasing, effects of in-situ stress on deformation and failure of the surrounding rock are increasingly growing. Through data independently measured and collected within 600-1500 m, this paper summaries distribution laws of in-situ stress in deep underground coal mines of our country, main existing types of in-situ stress and its directional characteristics. Maximum horizontal stress, minimum horizontal stress, vertical stress and lateral pressure ratio variation laws with depth are obtained by using regression analysis. Generally, in-situ stresses increase with depth. With increasing depth the rate of increase in horizontal stresses decreases. A considerable scatter in the in-situ stress test data may be due to distinct differences in both the strength and deformation moduli of strata located in varying geological environments and different coal districts. Two types of stress field distribution have been noted with σ_(Hvh) (σ_(Hmax)>σ_v>σ_(hmin)) and σ_(vHh)(σ_v>σ_(Hmax)>σ_(hmin)) found mainly in deep coal mines. The ratio of the maximum horizontal principal stresses to vertical stress is usually between 0.63 and 2.42 in the deep coal districts.
机译：随着煤炭开采的深度和强度的增加，原位应力对周围岩石变形和失效的影响越来越多地增长。通过独立测量和收集的数据在600-1500米范围内，本文在我国深层地下煤矿的原位应力分布规律，主要现有类型的原位应力及其定向特征。通过使用回归分析获得具有深度的最大水平应力，最小水平应力，垂直应力和横向压力比变异规律。通常，原位应力随深度而增加。随着深度的增加，水平应力的增加速率降低。在原位应力测试数据中具有相当大的分散可能是由于位于不同地质环境和不同煤区的地层的强度和变形模量不同的差异。 σ_（HVH）（Σ_（Hmax）>Σ_V>Σ_（vhh））和主要在深煤中的σ_（vhh））和σ_（vhh））和σ_（vhh）（Σ_v>σ_（hmin））的两种类型的应力场分布。矿山。在深煤区的最大水平主应力与垂直应力的比率通常在0.63和2.42之间。

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