新建隧道穿越施工对既有双线地铁隧道的影响

Influence of New Bored Tunnel Driven in Close Proximity on Existing Subway Tunnels

某越江隧道拟近距垂直穿越既有双线地铁隧道,本文采用大型非线形有限元分析软件进行了三维弹塑性数值模拟。研究内容主要为不同净距穿越时,新建隧道施工对既有地铁隧道的影响规律。计算结果给出了新建隧道近距垂直穿越既有双线地铁隧道时的力学规律。

This paper presents a numerical analysis of the influence of new bored tunnel driven in close proximity on existing subway tunnels in soft soil. The objectives of this study are to propose a useful suggestion for new bored tunnel construction. The scope of the research is the behaviors of existing tunnels while the new bored tunnel is constructed. Analysis is performed using a three - dimensional finite element model, which takes into consideration the presence of the existing subway tunnels during the construction of the new bored tunnel. The soil behavior is assumed to be governed by an elastic -plastic constitutive relation based on the Mohr-Coulomb criterion. As a result, the behaviors of the existing tunnels are established.