摘要
新奥法原理指导下的CRD分部开挖技术是目前大跨浅埋公路隧道施工的主要方法。鉴于大跨浅埋隧道不同施工工艺下围岩扰动影响差异较大,以宁常高速茅山隧道为例,采用多点电测锚杆和多点位移计对CRD法施工过程的围岩深层扰动区位移及应力进行监测与分析,得出围岩分步开挖的松动过程及松动圈主要分布特点,同时对锚杆设计支护深度的合理性进行验证,可为优化设计及指导施工提供技术根据。
Based on the principle of New Austria Tunneling Method, the Cross Diaphragm Method is usually selected to construct big-span shallow overburden highway tunnel. Considering the difference of surrounding rock disturbing range of different construction scheme, the Mao Mountain Tunnel located on the Ning-Chang highway, was studied as an example. The deformation and stress of surrounding rock were monitored by using four-point electric monitoring rock bolts and displacement gauges when constructing with CRD method. The loosing process and distribution properties of loosing zone were analyzed. The results showed that the length of the rock bolts was reasonable and can be taken as references for the optimizing of design and construction schemes.
出处
《交通标准化》
2008年第1期26-29,共4页
Communications Standardization
关键词
大跨
浅埋
CRD法
松动圈
隧道
big-span
shallow overburden
CRD method
loosing zone
tunnel
