基于现场监测位移的隧道围岩参数反演分析

根据高速公路隧道现场监测的实际情况，采用位移反分析法，利用编制出的Geo-Inverse.m程序，将分析得到的数据与现场实际的监测结果进行对比，综合比较水平收敛和拱顶沉降两项参数，结果表明：拱顶沉降和水平收敛的最大峰值分别为15.4 mm和14.4 mm，实测结果与反演结果分别相差0.4 mm和0.28 mm；隧道围岩基本参取值为弹性模量1.50 GPa，泊松比0.35，黏聚力350 kPa，说明该段围岩比较软弱，但是在支护过后能达到稳定状态。研究成果在隧道围岩反演方面具有一定的借鉴意义。

Inversion Analysis of Tunnel Surrounding Rock Parameters Based on Field Monitoring Displacement

Based on the actual situation of field monitoring of tunnel in expressway, the displacement back analysis method is adopted, and the Geo-Inverse. m program is used to compare the data obtained from the analysis with the actual monitoring results. The two parameters of horizontal convergence and vault settlement are comprehensively compared. The results show that the maximum peak values of vault settlement and horizontal convergence are 15.4 mm and 14.4 mm respectively, and the differences between the measured results and the inversion results are 0.4 mm and 0.28 mm respectively. The basic parameters of surrounding rock of tunnel are elastic modulus 1.50 GPa, Poisson ''s ratio 0.35, cohesion 350 kPa, which indicates that the surrounding rock is weak, but it can reach a stable state after support. The research results have certain reference significance in tunnel surrounding rock inversion.