基坑施工对隧道结构影响的数值模拟研究

Numerical simulation study on the subway tunnel structure influenced by the foundation construction

关于复杂地层条件中基坑施工对地铁结构的影响及运营安全意义重大。以某一地铁建设工程为研究对象,通过有限元计算模拟的手段,展开基坑的开挖及桩基施工对隧道结构位移及力学性质的影响研究。指出在基坑下部桩基的加载过程中,隧道的应力应变变化较小,隧道底部应力变化最大,其顶部竖向位移最大,且两侧的水平位移最大。

The effect of foundation pit construction in the complex formation conditions for subway structure and operational safety has been of great significance. A metro construction project as the research object, the study on the impact of the excavation of foundation pit and piling con-struction for the displacement and mechanical properties of the tunnel structure is carried out by means of finite element simulation. As the pile foundation load is increasing under the foundation pit bottom, the pressure and stress variation at the bottom of the tunnel is greater than the top of the tunnel. The maximize vertical displacement change of the tunnel is the top of the tunnel. The maximize horizontal displacement change of the tunnel is in the lateral tunnel.