摘要
总宽度达35.4m的福州市二环路象山隧道,于1996年2月建成通车,是国内目前投入使用的最大跨度的城市道路隧道。象山隧道埋深为2～23m,上部覆盖层主要为第四纪残、坡积砂质粘土和强风化的花岗斑岩。建筑型式为四跨连拱,采用钻爆法掘进。设计基于岩土力学理论,利用电算程序模拟施工进程,对各种工况下围岩稳定性和受力状态予以解析计算;结合既有的工程经验,进行支护结构与辅助性施工措施设计;在现场建立监控量测组跟踪施工、服务于生产,从而实现设计信息化。
The Xiangshan Tunnel on the second ring road of Fuzhou City, with a total width of 35. 4m and a depth of 2-23m, was completed in February 1996. It is an urban road tunnel with the largest span in China. Moreover, the cover strata consists mainly of the residual and colluvial sandy clay of Quaternary period and the heavily weathered granite porphyry. The tunnel, with a span of quadruple arches, was excavated by the drill and blast method. The design was based on the rock and soil mechanical theory and the stability of surrounding rock and the stress situation in various cases were analytically calculated, while the support structure and auxiliary construction measures was designed on the basis of experiences. In order to modify the design according to the feedback information, a supervisory group was set up in site to monitor the construction.
关键词
大跨度隧道
浅埋隧道
围岩
稳定性
隧道
Large-Span Tunnel
Shallow Tunnel
Stability of Surrounding Rock
Monitoring
