地铁荷载作用下隧道土体变形的数值模拟

天津市区地铁隧道一般埋设于第一海相软土层中,目前针对这一海相软土层在地铁荷载下隧道周围土体变形的研究较少.本文利用ABAQUS有限元软件,模拟地铁运行荷载,对比分析隧道周围土体在竖向和水平方向上距隧道不同距离处土体的变形,结果表明:土体变形较大的区域主要集中在以隧道轴线为中心的10,m范围内,工程建设时对此区域土体要重点关注;而在30,m以外区域土体变形较小.分析结果为以后在现有地铁隧道沿线建设地下构筑物时提供了有价值的参考.

Numerical Simulation Analysis in the Soil Deformation of Tunnel under the Subway Vibrational Loading

The subway tunnel in Tianjin generally lies in the first marine soft soil. There is few research on the deformation of soil around the subway tunnel. This paper uses the numerical simulation analysis software ABAQUS to imitate and analyse the vibration of the subway train, as well as the soil deformation in the vertical direction and horizontal direction. We con- clude that the soil deformation mainly focus on the area which is ten meters from the center of the tunnel axis. Much more attention must be payed in the field of engineering construction. There is almost no deformation beyond thirty meters from the center of the tunnel axis. The analysis conclusion would provide valuable references for the underground space exploita- tion structure which is under the existed subway tunnel.