京珠高速公路温泉隧道的施工监测及位移反分析

介绍京珠高速公路温泉隧道的原位量测与监控系统,先对隧道围岩收敛、拱顶下沉及其内部位移等实测数据进行分析,并根据隧道围岩收敛情况,利用位移反分析程序BMP90,进行反分析得到等效弹性模量以及侧压力系数等地层参数,对隧道围岩的稳定性进行了评价。利用反分析得到的弹性模量等地层参数进行了二维弹性有限元分析,并与实测结果进行了简单的对比分析。分析结果表明等效弹性模量应取终测时刻反分析值或较小的反分析值比较接近实际,反分析侧压力系数通常可取全程回归分析值;利用反分析得到的地层参数对隧道开挖进行二维弹性有限元分析结果与实测值相符合。

Monitoring and Back Analysis of Displacement of Jing-zhu Expressway Wenquan Tunnel

The paper presents the monitoring system of Wenquan tunnel of Jingzhu expressway analysis of the monitoring data,such as the convergence,crown displacement,internal displacement and back analysis were performed using the displacement back analysis program BMP90,with the equivalent elasticity modulus and lateral load factor obtained by the analysis. The paper also predicts the stability of the tunnel surrounding rock. And 2D elastic finite element analysis was adopted using the elasticity modulus obtained by back analysis.The computing results were compared with the survey data insitu.The results show that the selection of ground factors of back analysis results is important. For equivalent elasticity modulus,the lasttime result or lesser value is close to the fact. And global regression value should be selected for lateral load factor. The accuracy of the solutions based on the FEM is good compared with those survey data insitu.