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地应力是工程稳定性设计的基本参数,与岩石力学性质密切相关。根据收集到的969组地应力实测数据,对最大和最小水平主应力随深度H的变化规律进行了回归分析;并从中选取同时带有岩石弹性模量E和泊松比v的112组数据,研究了E、v与H的关系、最大和最小水平主应力分别与E、v的关系及最大和最小水平主应力与H和E的关系。结果表明,我国大陆地区最大和最小水平主应力整体上随深度增加而增大,呈线性增长关系;E与H没有明显的相关关系,随H的增加而有降低趋势;v整体上随H变化幅度较小,数据主要集中在直线v=0.23的两侧;消除深度的影响后,所选取的3个深度范围的最大水平主应力与E有一定的正相关关系,最小水平主应力与E的线性相关性较差,且出现了不一致现象,E对最小水平主应力的影响程度较小,对最大水平主应力的影响程度较大;最大和最小水平主应力总体上均随v增加有增大趋势,规律性不显著;对于最大和最小水平主应力分别与H和E的关系,修正了已有的数学模型,回归精度有所提高。
Geostress is the basic parameter of engineering stability design, which is closely related to the rock mechanical properties. Based on the collected data of 969 sets of in-situ stress measurements, regression analysis was performed on the variation rules of maximum and minimum horizontal principal stress with depth H, and 112 sets of data with both elastic modulus E and Poisson’s ratio v were selected for study The relationship between E, v and H, the relationship between maximum and minimum horizontal principal stress and E, v and the relationship between maximum and minimum horizontal principal stress and H and E, respectively. The results show that the maximum and minimum horizontal principal stress in China increases linearly with depth as a whole. There is no significant correlation between E and H, but decreases with increasing H; The data are mainly concentrated on both sides of the straight line v = 0.23. After eliminating the influence of depth, the maximum horizontal principal stress in the three depth ranges has certain positive correlation with E, and the minimum horizontal principal stress and E Linear correlation is poor, and there is inconsistency. E has a less influence on the minimum horizontal principal stress and a greater impact on the maximum horizontal principal stress. The maximum and minimum principal stresses generally increase with the increase of v Trend and regularity are not significant. For the relation between maximum and minimum principal stress and H and E respectively, the existing mathematical model is corrected and the regression precision is improved.