嘎隆拉隧道围岩力学参数对变形的敏感性分析

以嘎隆拉隧道为研究背景，根据现场地质状况建立可变参数的有限元模型，以现场监测变形数据为基础，对力学参数（弹性模量、泊松比、黏聚力、内摩擦角）和侧压力系数进行反分析，获取现场围岩参数的真实值。在此基础上，基于敏感性分析方法，研究围岩力学参数对变形的敏感性。研究结果表明：拱顶沉降对弹性模量比较敏感，对其它参数的敏感性相对较小；而周边收敛则相反，泊松比、内摩擦角、黏聚力要比弹性模量更为敏感。研究结果对嘎隆拉隧道的稳定性分析具有一定的参考价值。

Sensitivity analysis of mechanical parameters to deformation of surrounding rock in Galongla tunnel

Taking Galongla tunnel as an example,a finite element model of variable parameters is established according to the geological conditions.On the basis of deformation monitoring data,back analysis is performed for the mechanical parameters including elastic modulus,Poisson’s ratio,cohesion,internal friction angle and lateral pressure coefficient in order to get the real values of surrounding rock.Then the proposed sensitivity analysis method is employed to study the sensitivity of the mechanical parameters of surrounding rock to deformation.The results show that,for vault settlement,the elastic modulus is more sensitive than the other parameters.For the surrounding convergence which is opposite to the vault settlement,the Poisson’s ratio,cohesion and internal friction angle are more sensitive than the elastic modulus.The results of this study have a certain reference value for the stability analysis of Galongla tunnel.