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为解决隧洞围岩稳定性分析问题,开展了基于广义Hoek-Brown屈服准则强度折减法的研究.在有限差分软件FLAC~(3D)中利用FISH语言编制强度折减程序,并以计算收敛性和特征点位移突变性为判据,求得整体安全系数.针对广义Hoek-Brown屈服准则四个基本输入参数σ_(ci)、m_i、GSI和D,引入等效接近度概念,以此为基础对比分析了七种强度折减路径的合理性,得出折减路径的合理性依赖于具体工程参数的结论,并通过工程实例对比验证了上述结论.隧洞稳定性随D值的增大而降低;将计算收敛性以及特征点位移突变性相结合作为其稳定性的判断标准更为合理.
In order to solve the problem of stability analysis of tunnel surrounding rock, a study on the strength reduction method based on the generalized Hoek-Brown yield criterion is carried out. The strength reduction procedure is compiled by FISH language in finite difference software FLAC ~ (3D) And the feature point displacement mutation is taken as the criterion to obtain the overall safety factor.According to the four basic input parameters σ_ (ci), m_i, GSI and D of the generalized Hoek-Brown yield criterion, the concept of equivalent proximity is introduced, on the basis of which The rationality of the seven kinds of strength reduction paths is analyzed, and the conclusion that the rationality of the reduction path depends on the specific engineering parameters is validated and verified by engineering examples. The stability of the tunnel decreases with the increase of D value. It is more reasonable to combine the calculation convergence and the displacement mutation of feature points as the criterion of its stability.