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处于高地应力环境的硬岩工程,由于开挖扰动导致围岩应力环境变化,进而发生脆性剥落破坏。线性工程沿洞线地应力场分布受到各种因素的影响,判别沿线地应力分布规律对于施工安全和衬砌支护设计具有重要意义。在介绍初始地应力分布统计规律的基础上,对地下洞室轴线与初始地应力场排布不同组合情况下,围岩二次应力场及偏应力分布规律进行了模拟研究。基于硬脆性岩石破坏准则,推导了考虑硬脆性围岩破坏宏观表征的洞轴平面初始应力场求解公式,对所推导的公式进行了工程验证,结果比较吻合。研究结果可为深埋硬岩隧道工程初始地应力场量值判别及工程支护设计提供一定的借鉴和参考。
In the hard rock project with high ground stress environment, the stress environment of the surrounding rock changes due to the disturbance of excavation, and then the brittle spalling failure occurs. The distribution of ground stress field along the line of linear engineering is affected by various factors. It is of great significance to judge the distribution of ground stress along the line for construction safety and lining support design. Based on the statistical laws of initial geostress distribution and the different combinations of the underground cavern axis and initial geostress field, the secondary stress field and the distribution of deviatoric stress of surrounding rock are simulated. Based on the criterion of hard and brittle rock failure, the formula for solving the initial stress field of hole plane considering the macroscopic characterization of hard and brittle surrounding rock is deduced. The calculated formulas are validated and the results are in good agreement. The results can provide some reference and reference for the initial geostress field value identification and engineering support design of deep hard rock tunnel.