地应力弹性参数计算的应力区间分级方法研究

发布时间：2018-04-26 00:06

本文选题：岩石力学 + 地应力测量　；参考：《岩石力学与工程学报》2014年S1期

【摘要】：对套孔应力解除法地应力现场测量获得的套孔岩芯进行围压率定试验,是后期数据处理获取岩石弹性参数的重要手段,其结果直接影响地应力计算值的精度。目前,参与地应力计算的弹性参数由围压试验中的最高围压值与对应的应变计算获得,受试验条件、岩石的非线性影响,结果存在一定的误差。利用围压率定仪对多组套孔岩芯试样进行率定试验,研究不同岩性岩石围压率定试验曲线特征规律;基于多重误差因素分析,对试验应力应变曲线进行合理修正。结合岩石的加卸载变形理论,考虑岩石非线性特征,提出一种将弹性参数划分成不同应力区间计算的方法。将该方法运用到平煤十矿(平顶山天安煤业股份有限公司十矿)实测地应力的计算中,修正后的主应力计算结果随深度呈现出更好的线性相关性,与实际情况符合较好,研究成果对提高套孔岩芯弹性参数及实测地应力的计算结果精度具有一定的参考意义。
[Abstract]:The determination of confining pressure rate of the core of the casing hole obtained by in-situ measurement of in-situ stress by the method of in-situ stress relief is an important means of obtaining the elastic parameters of rock in the later stage of data processing, and the results directly affect the accuracy of the calculation value of the in-situ stress. At present, the elastic parameters involved in the calculation of in-situ stress are obtained by the calculation of the maximum confining pressure and the corresponding strain in the confining pressure test. Due to the influence of the test conditions and the rock nonlinearity, there are some errors in the results. In this paper, the confining pressure gauge is used to carry out the rate determination test on the core samples with multiple sets of holes to study the characteristic law of the test curve of the confining pressure ratio of different lithologic rocks, and based on the analysis of multiple error factors, the test stress should be changed curve is revised reasonably. Based on the theory of rock loading and unloading deformation and considering the nonlinear characteristics of rock, a method for calculating elastic parameters into different stress intervals is proposed. The method is applied to the calculation of the measured ground stress in Pingdingshan Tianan Coal Industry Co., Ltd., and the calculated results of the modified principal stress show a better linear correlation with the depth and are in good agreement with the actual situation. The research results have certain reference significance for improving the accuracy of the elastic parameters of the core and the measured results of in-situ stress.
【作者单位】：北京科技大学土木与环境工程学院;北京科技大学金属矿山高效开采与安全教育部重点实验室;
【基金】：国家自然科学基金资助项目(11002021,51034001) 国家高新技术研究发展计划(863)项目(2008AA062104)
【分类号】：TU45

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