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地应力测量分析在煤矿安全高效开采中具有非常重要的作用,但以往对地应力测试结果的可靠程度、影响因素及其误差分析方面研究较少。利用概率统计、Monte Carlo数值模拟等技术手段建立空心包体应变计法测试地应力的参数敏感性和误差估算模型,并以国投新集能源股份有限公司两淮矿区4个矿井的实验测试数据为例,统计分析了岩体物理力学参数分布概型和特性参数,并对地应力测量结果的敏感性因素及其影响规律进行了研究。结果表明:岩体泊松比、弹性模量和测孔直径是影响地应力大小的关键因素,而测孔方位角、岩体泊松比和内摩擦角则是影响地应力方位的重要因素,并通过多元回归分析方法获得了最大主应力的相对误差和方位偏角估算公式。研究成果可为空心包体应变计法测量地应力的结果可靠性分析及其他相关测试研究提供重要借鉴。
In situ stress measurement analysis plays an important role in the safe and efficient mining of coal mines. However, the reliability, influence factors and error analysis of ground stress test results in the past are few. The probability and statistics, Monte Carlo numerical simulation and other technical means to establish hollow inclusion strain gauge method to test the parameters of the geostress sensitivity and error estimation model, and Guotou Xinji Energy Co., Ltd. Huaibei 4 mining test data As an example, the distribution and parameters of physical and mechanical parameters of rock mass are statistically analyzed, and the sensitive factors of ground stress measurement and their influence laws are studied. The results show that the Poisson’s ratio, elastic modulus and pore diameter of rock mass are the key factors that influence the size of in-situ stress. However, the azimuth of hole, the Poisson’s ratio of rock mass and the angle of internal friction are important factors affecting the geostress. The relative error of the maximum principal stress and the formula of azimuthal deviation were obtained by multiple regression analysis. The research results can provide an important reference for the reliability analysis of the results of measuring the stress of hollow inclusion strain gauge and other related tests.