浅埋隧道下穿钱塘江输水渠加固和保护技术

Reinforcement and Protection Technique of Shallow Buried Tunnel Crossing Underneath Qiantangjiang Conveyance Canal

以杭州市紫(紫金港)之(之江路)隧道工程为依托,对紫之隧道西线超近距离下穿既有钱塘江输水渠施工中地面塌陷处理和输水渠保护问题进行了研究。首先介绍了隧道下穿既有结构时常用的保护方法,然后针对施工现场地层软弱和地下水渗流较强的特点,采用了回填混凝土、管线悬吊保护、补做围护桩、锚杆加固等地面塌陷处理和管线保护技术,为类似地层中隧道下穿施工管线保护提供参考。

Based on the construction of Zijingang-Zhijianglu tunnel engineering in Hangzhou,the issues such as ground collapse treatment and conveyance canal protection were studied for the west line of Zizhi tunnel crossing underneath the existing Qiantang jiang conveyance canal at short range. Commonly used protection methods for the tunnels crossing underneath the existing structure were introduced,and the ground collapse treatment and pipeline protection techniques including concrete backfilling,pipeline suspension protection,enclosure pile reinforcing and anchor consolidation were adopted according to the stratum weakness and strong groundwater seepage in construction site,which could provide a reference for pipeline protection of tunnel underneath construction in similar stratum.