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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 situation that the complicated stress field has a great influence on the deformation of the soft surrounding rock tunnel, the lateral pressure coefficient of the surrounding rock is determined by means of the monitoring displacement information and the inversion theory. Value of the vault settlement on-site monitoring data, as well as the rock around the hole level deformation, respectively, using exponential, hyperbolic and logarithmic model of MATLAB regression analysis, and the use of FISH language compiled lateral pressure coefficient λ command, based on the elastic-plastic displacement By using the golden section method, the optimal time-history curve equation and the inversion analysis of the lateral pressure coefficient λ are obtained. The final solution of λ is obtained as 1.130. The result reaches the requirement of convergence precision and the inversion of λ has Important research significance.