摘要
根据双联拱隧道结构型式特点和新奥法监控量测原理,利用钢弦式土压力盒与DKY-51-2型振弦式传感器记录仪对襄十高速公路3条双联拱隧道中隔墙顶部围岩和支护层间的压力进行量测,并采用光弹性单向应变计对隧道边墙和中隔墙混凝土的应力与应变进行量测。结果表明:中隔墙顶部的压力随时间增加而增大,最大可达到7MPa,且受施工爆破的影响会产生较大的突变;中隔墙混凝土墙身段的应力值普遍小于3MPa,且不同方向、不同深度处应力值有一定的差异。利用2D-σ有限元软件对隧道施工过程中的结构受力状态进行模拟,模拟结果与监测结果吻合较好,说明上述监测手段很好地反应了中隔墙的应力-应变状态,为隧道施工及其稳定性评价提供了指导依据。
According to the structure characteristics of double-arch tunnel and monitoring-measurement principles of NATM, steel-chord pressure box and vibrating-wire sensor recording devices of DKY-51-2 were used to measure the pressures between top rock mass and supporting layer of central division walls of three Double-arch Tunnels. Photoelastic strain gauges were also used for the measurement of stress and strain of concrete surface. It is indicated from the results that, the pressure value at top of central division walls increases with the time and reaches to 7 MPa at maximum, and it could get a larger mutation after blasting; the stress value of concrete sections of central division walls is smaller than 3 MPa, and it is somewhat different with the directions and depths.The structural stress state was also numerical simulated by 2D-σ software, and the result is close to the monitoring result.The monitoring method can reflect the stress-strain state of central division walls, and also provides a guidance for the tunnel construction and stability analysis.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第6期99-103,共5页
Journal of Highway and Transportation Research and Development
基金
湖北省交通厅科研项目(鄂交[2001]495)
关键词
隧道工程
双联拱隧道
新奥法
有限元
应力-应变监测
中隔墙
tunnel engineering
double- arch tunnel
NATM
finite element method
stress and strain monitoring
central division wall
