考虑施工过程的地铁盾构仿真模拟及沉降分析

Numerical Analysis of Shield Tunnel Settlement Considering Construction Process

研究目的:随着城市建设的不断发展,地铁的开发和利用已经扩展到各个工程领域,且发挥着重要的社会和经济效益。同时,地下隧道网络的不断完善使得盾构施工现象大量涌现,施工的相互影响问题也日益突出。本文以大连地铁202标段香沙区间为例,对盾构开挖引起地表沉降规律进行模拟,并结合工程实际地质情况和现场监测数据进行盾构开挖的三维仿真分析,研究其对周围环境的影响效应。研究结论:结果表明:(1)在盾构施工中,横向地表沉降呈V形,即在盾构正上方地表沉降大,两边沉降逐渐减小;(2)纵向地表沉降呈S形,即盾构开挖面正前方呈隆起,开挖面后呈下沉,在距开挖面后一定距离沉降呈稳定;(3)本研究成果可用于施工过程中地铁盾构隧道的监测与分析。

Research purposes： With the development of urban construction, underground tunnel brings social and economic benefits in various engineering fields. At the same time, the impact of shield construction is also increasingly prominent. The research on shield tunneling of 202 bid section of Dalian metro is carried out to analyze the influential effect of surface settlement by three -dimensional finite element, combined with geological conditions and on -site monitoring data. Research conclusions：The results show that： （1） The V -shaped lateral surface subsidence is large above the shield, and it decreases on two sides. （2） The vertical surface subsidence is S -shaped, that is the ground heaves in the front of excavation face, it sinks in the back of excavation face, and it is stable in the certain distance. （ 3 ） The research results of this paper can monitor metro shield tunnel in the construction.