基于ABAQUS大跨度双联拱隧道开挖的数值模拟分析

Numerical analysis of excavation method of large-span double-arch tunnel based on ABAQUS

针对大跨度双联拱隧道开挖工程中应力变化规律问题,本文选用ABAQUS软件对大跨度双联拱隧道进行二维数值模拟,分析"三导坑法"施工顺序下其隧道应力、应变及塑性变形区域分布情况,结果表明:在隧道开挖过程中,其应力应变最大位移出现在隧道顶部位置,为12 mm,最大压应力出现在中导墙处,为3.5 MPa,拉应力最大出现在拱顶处,为2.5 MPa,最大塑性变形出现在中导墙左上方,为0.52 mm。上述研究结果表明该类隧道工程施工的关键点是加密拱顶、中导墙处的监控量测和初支加固,这可为工程服务,并为今后类似工程的设计、施工提供借鉴。

Aiming at the stress variation law in the excavation of large-span double-arch tunnel,the two-dimensional numerical simulation of large-span double-arch tunnel was carried out by using ABAQUS software. The distribution of stress,strain and plastic deformation in the tunnel under the construction sequence of " three-guide-pit method" was analyzed,and the maximum displacement occurs at the top of the tunnel during the excavation process was summarized,which was 12 mm. The maximum compressive stress is 3. 5 MPa at the middle guide wall,the maximum tensile stress is 2. 5 MPa at the vault,and the maximum plastic deformation is 0. 52 mm above the left of the middle guide wall. It is concluded that the key points in the construction of this kind of tunnel project are the monitoring and measurement of the infill vault and the middle guide wall and the initial support reinforcement. The research results directly serve the project and provide reference for similar projects in the future.