软弱围岩隧道侧压力系数反演分析

Inverse analysis of soft rock tunnel lateral pressure coefficient

针对复杂的应力场对软弱围岩隧道变形影响较大的情况,借助监测位移信息结合反演理论,采用数值方法,确定围岩的侧压力系数.对韩杖子隧道现场监测、隧道洞周围岩变形值,对拱顶下沉现场监测数据,以及洞周围岩水平变形,分别采用指数、双曲和对数模型进行MATLAB回归分析,并利用FISH语言编制求解侧压系数λ的命令,依据弹塑性位移反分析法,通过采用黄金分割法,得出最佳时态曲线方程以及实现对侧向压力系数λ的反演分析,得到λ最终解为1.130,结果达到收敛精度要求,对λ进行反演具有重要的研究意义.

Aiming at the issue that the complex stress field has a greater influence on the deformation of soft rock tunnel, this paper determined the lateral pressure coefficient of surrounding rock by means of monitoring displacement information method, combining with numerical inversion theory, and analyzed the data from the field monitoring for Han Zhang Zi tunnel, tunnel cave surrounding rock deformation value, the vault subsidence field monitoring data, and the level of the surrounding rock deformation respectively by using the exponential, hyperbolic and logarithmic model MATLAB regression analysis. The solution is prepared by using FISH language λ command, lateral pressure coefficient based on the elastic-plastic displacement back analysis method, through using the golden section method, this study obtained the optimum temporal curve equation as well as the realization on the lateral pressure coefficient inversion analysis of λ, and get the final solution is 1.130, the result reaches the convergence precision, has important significance to carry out the inversion of λ.（缺研究结果）