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Hoek-Brown准则综合考虑岩体结构、岩块强度等因素,能很好地反映岩体的非线性破坏,更符合工程实际,但其参数选取的主观性及不确定性严重影响其应用效果。通过分析敏感性分析结果及Hoek-Brown准则的圆形硐室围岩位移表达式,借助FLAC~(3D)数值模拟和回归性分析建立了基于Hoek-Brown准则的非线性回归模型,结合差分进化算法提出了合理的位移反分析方法及步骤,并成功应用于青岛地铁工程。结果表明,所建立的非线性回归模型能较好地反映隧道位移与地质强度指标GSI、扰动系数D及泊松比μ的关系,所提出的位移反分析方法能较准确地反演获得GSI、D、μ值,由所得反演参数值计算的位移与现场监测位移的相对误差较小,具有良好的一致性,验证了该方法的合理性、准确性,为准确获取Hoek-Brown准则参数提供了新方法。
The Hoek-Brown criterion considers the rock mass structure and the strength of the rock mass comprehensively and can well reflect the nonlinear failure of the rock mass, which is more in line with the engineering practice. However, the subjectivity and uncertainty of the parameter selection seriously affect the application effect. By analyzing the results of sensitivity analysis and Hoek-Brown criterion, the nonlinear regression model based on Hoek-Brown criterion is established by FLAC 3D numerical simulation and regression analysis. Combined with differential evolution The algorithm proposed a reasonable method and step of displacement back analysis and successfully applied to Qingdao Metro Project. The results show that the established nonlinear regression model can well reflect the relationship between tunnel displacement and geological intensity index GSI, disturbance coefficient D and Poisson’s ratio μ. The proposed displacement back analysis method can accurately retrieve GSI, D and μ values. The relative error between displacement calculated from the obtained inversion parameters and on-site monitoring displacement is small and has good consistency. The rationality and accuracy of the proposed method are verified. In order to obtain the Hoek-Brown criterion parameters accurately A new method