深埋隧道围岩应变软化模型参数的正交设计

研究高应力环境下岩体单元塑性软化变形对深埋隧道围岩位移的影响规律,采用基于莫尔库仑与拉破坏复合破坏准则的应变软化模型对深埋隧道的开挖卸荷进行数值仿真,按照正交实验方法设计计算方案。根据计算结果,得出应变软化模型力学参数对围岩水平收敛位移影响程度的大小,建立围岩水平收敛位移与应变软化模型力学参数之间的经验公式,为深埋隧道围岩的稳定性分析提供了理论依据,对实际工程施工也有重要的参考价值。

Orthogonal design of mechanical parameters in a strain softening model for deeply-buried tunnels

A deeply-buried tunnel opening was modeled numerically using the strain softening model based on the composite Mohr-Coulomb criterion with tension cut-off failure,and an orthogonal numerical experiment was conducted.These things were done to reveal the relationship between plastic strain with softening deformation in high-situ stress for rock masses and the surrounding rock displacement.The degree of influence of these strain softening parameters on the surrounding rock horizontal displacement were obtained from the results and the quadratic surface relation between these parameters and the surrounding rock displacement was given.This method provided a theoretical basis for the stability analysis of deeply-buried tunnels and made reference to actual engineering.