摘要
隧道施工引起的地表沉降机制复杂,很难定量预测隧道施工引起的地表沉降及发展过程。结合某浅埋铁路隧道施工,应用有限元软件对分部开挖进行非线性数值模拟,分析隧道开挖过程中的地表沉降变形。分析结果表明:该隧道采用拱部φ159mm大管棚、间距25cm、长度30m,掌子面帷幕注浆等超前支护措施,在确保注浆效果和管棚施工质量的条件下,地表沉降可得到较好的控制。
The mechanism of the tunnel-construction-caused surface subsidence being very complex,it’s very difficult to quantitatively predict the surface subsidence caused by tunnel construction and its developing process.With the construction of a certain shallow-depth railway tunnel as a practical example,a nonlinear numerical simulation is made of the sectioned excavation with the finite element software,with the surface subsidence during the excavation analyzed in the paper.The results of the analysis show that the surface subsidence can be effectively controlled when the support of φ159 mm large pipe-roof protection is used in the arch area,and the spacing of 25 cm,the length of 30 m and other leading support measures are adopted,such as applying the curtain grouting to the working face,and when the grouting effect and the pipe-roof protection quality are ensured.
出处
《国防交通工程与技术》
2013年第1期56-59,共4页
Traffic Engineering and Technology for National Defence
关键词
隧道
超前支护
拱顶下沉
地表沉降
数值模拟
tunnel
leading support
settlement in the arch crown
surface subsidence
numerical simulation
