摘要
针对高铁隧道IV,V级软弱围岩采用的大断面开挖工法,为确保作业安全,现场在围岩变形量测的基础上,对围岩、锚杆、钢架、初期支护混凝土、二衬混凝土进行了应力应变监测,切实掌握隧道开挖后,围岩、初期支护结构、二衬的各阶段受力状态,通过二者数据的对比分析,掌握软弱围岩条件下围岩变形速率、受力状态及稳定性评价,从而判断施工是否安全,可为类似作业工法提供经验借鉴。
The large cross-section excavation method adopted for high-speed rail tunnels of class IV and V weak surrounding rocks.The concrete and the second-lined concrete were monitored for stress and strain.After the tunnel was excavated,the stress state of the surrounding rock,the initial support structure and the second-lined concrete was grasped.Evaluation of rock deformation rate,stress state and stability,so as to judge whether the construction is safe,can provide experience for similar operation methods.
出处
《建筑技术开发》
2020年第7期54-56,共3页
Building Technology Development
关键词
高速铁路隧道
软弱围岩
大断面
应力应变监测
high-speed railway tunnel
weak surrounding rock
large section
stress and strain monitoring
