珠藏洞隧道施工安全监测与量测分析

Safety Monitoring and Measurement Data Processing for Zhuzangdong Tunnel Construction

为保证谷城至竹溪高速公路珠藏洞隧道开挖过程中的施工安全,在优化围岩变形监测方案与预警方法的基础上,采用指数函数回归分析模型,对典型监测断面位移量测数据进行了回归分析与精度判定。结果表明:指数函数能较好地拟合实测值,且能反映隧道开挖后围岩的时态变化情况,可以作为围岩稳定性判定和确定二次衬砌施作时间的依据;典型监测断面的拱顶沉降和周边收敛累计位移均远小于警戒值,隧道围岩稳定性较好,支护结构合理。

To ensure the construction safety of Zhuzangdong Tunnel of Gucheng-Zhuxi Expressway,the monitoring programs and early warning methods for surrounding rock deformation are optimized. On this basis,the measured deformation data of typical monitoring sections are analyzed through regression method and the measurement precision is analyzed by the regression model of exponential function. Results show that the regression values based on exponential function match well with the measured data,and reflect rock deformation after tunnel excavation. This research provides basis for the stability evaluation of rock and the determination of secondary lining time. Both the accumulative arch settlement and peripheral convergence of typical monitoring section are less than the alert value of displacement,indicating the surrounding rock of tunnel has better stability and the supporting structure is reliable.