既有隧道间新建小净距大断面四车道隧道动态施工监测技术

In-situ Monitoring for the Construction of Closely-spaced Four-lane Large Profile Tunnels from Two Existing Tunnels

目前小净距四车道公路隧道的设计和施工经验相对不足,因而监控量测工作显得尤为重要。文章依托工程的监控量测成果,阐述了动态监测在工程实践中的重要应用价值;针对隧道施工特点进行了方案设计及优化;对边坡沉降、拱顶下沉等典型数据进行了分析,很好地反馈施工;通过对监测数据的统计分析,提出了小净距、大跨径四车道隧道围岩变形的建议预警值;监测工作为项目顺利、安全地进行提供了保证。项目实施经验及研究成果可为类似条件下工程的设计、施工和监测提供借鉴。

Monitoring becomes especially important due to the shortage of construction and design experience for four-lane twin tunnels with small clear-spacing. Based on the monitoring data, this paper discusses the important application value of in-situ monitoring; putting forward design optimization according to the project features; analyzing the typical data of slope settlements and crown subsidence for the feedback to design and construction; advancing early-warning displacements for the project of large profile tunnels with small clear-spacing. In-situ monitoring ensured the safe and successful completion of the project. The practice can be referred to by similar projects.