褶曲构造型矿区地应力测量、反演及其应用

Stress field measurements, inversion and its application in mining area of fold stereotype

矿井地应力研究对于煤矿围岩控制和动力灾害防治具有重要的意义。基于矿区构造应力场演化特征和地应力现场实测,分析褶曲构造型矿区的地应力场类型及量级,研究褶曲构造对地应力的影响。采用多元线性回归分析方法,反演褶曲构造型矿区的地应力场分布情况。通过分析褶曲构造型矿区地应力与矿井灾害的关系,提出地应力测量及反演在矿井围岩稳定性设计和动力灾害防治中的应用方法。研究结果表明,褶曲构造型矿区地应力场分布受地质构造影响显著,属于σ_H>σ_h>σ_v型水平主控应力场;褶曲轴部应力值较大,最大主应力方向与轴部走向垂直,翼部会发生一定的偏转。根据地应力场反演结果可知,地应力集中程度与褶曲产状密切相关,褶曲变异程度越大,其附近区域应力集中程度越明显;褶曲构造型矿区地应力与巷道稳定性、冲击地压和煤与瓦斯突出等动力灾害有着紧密的联系,通过地应力测量及反演可以有效指导矿井进行巷道优化布置和灾害防治。

Research of in-situ stress is of great importance for rock control and dynamic disaster prevention in coal mine. Based on analysis of evolution characteristics of stress field and in-situ stress measurement, the type and magnitude of stress field were learned and effect of fold structure on in-situ stress was studied. By the inversion method of multiple linear regression analysis, the in-situ stress field distribution of mining area of fold stereotype was studied. Furthermore, the relation of in-situ stress and disasters in fold stereotype mining area was analyzed, and the application methods of in-situ stress measurement and inversion on design of rock stability and dynamic disaster prevention were studied. The research showed as following, firstly, affected by the geological structure significantly, the type of in-situ stress field was horizontal-master stereotype, which was σH〉σh 〉 σv. Secondly, the stress value of fold axis was much bigger than the other zones, and the maximum principal stress direction was vertical with the axis＇ trend, and however the one of wing will deflect. Thirdly, according to the inversion results of in-situ stress, the greater folds varied, the bigger in-situ stress value become. Lastly, on account of the closely link of roadway stability, impact, coal and gas outburst and in-situ stress, the mine roadway optimization and disaster prevention can be guided effectively through the in-situ stress measurement and inversion.