双马蹄形隧道开挖有限元模拟
Finite Element Simulation of Double Horseshoe Tunnel Excavation

隧道开挖将不可避免地对地表沉降产生影响，从而影响其周边建筑物的安全性。利用有限元软件COMSOL建立双马蹄形隧道开挖的二维模型，并对其塑性应变区域和地表沉降进行了有限元仿真模拟，分析后给出了土体开挖前后以及隧道不同间距时的应力分布图、等效塑性应变图和地表沉降曲线。通过有限元模拟可以直观的看到土体在开挖前后的状态，为真实的隧道开挖提供了参考依据。
Tunnel excavation will inevitably affect the ground surface settlement, thus affecting the safety of surrounding buildings. The two-dimensional model of double horseshoe tunnel excavation is established by using the finite element software COMSOL, and its plastic strain area and surface settlement are simulated by finite element method. After analysis, the stress distribution diagram, equivalent plastic strain diagram and surface settlement curve before and after soil excavation and at different tunnel distances are given. Through finite element simulation, we can intuitively see the state of soil before and after excavation, which provides a reference for real tunnel excavation.