深圳地铁并行叠落隧道施工相互影响的数值模拟分析

以深圳地铁9号线银湖站西端五线叠落隧道为例,采用有限元数值模拟分析了不同情况下6号线与9号线叠落施工的相互影响,研究表明:施作二次衬砌后的矿山法隧道在9号线施工影响下拱顶及底板的变形小于未施作二次衬砌的情况;在二次衬砌强度达到60%后即可进行上跨隧道的施工;在6号线与9号线隧道施工符合要求的情况下,由于相互影响而产生的变形在允许范围内,证明盾构法、矿山法叠落隧道施工的可行性。总结了叠落隧道施工的关键技术,指出同期完成深圳地铁9号线与6号线的叠落隧道建设大大减少了后期6号线建设的施工风险。

Numerical Simulation of Mutual Influence in Construction of Parallel Overlapping Tunnels of Shenzhen Metro

The mutual influence in the construction of Line 6 and Line 9 of Shenzhen Metro in different situations is simulated by finite elements software, with the 5 parallel overlapping running tunnels located to the west end of Yinhu station as examples. Studies show that: 1) under the influence of the construction of Line 9, the deformation of the crown and floor of the drill & blast tunnel with secondary lining is less than that without secondary lining; 2) when the strength of secondary lining reaches 60% of the design value, the construction of the overpassing tunnel can be carried out; 3) with the construction of the tunnels of Line 6 and Line 9 complying with relevant requirements, the deformation caused by the mutual influences is within the acceptable range, which indicates that the construction of the parallel overlapping tunnel by drill & blast method and shield method is feasible. In the paper, the key technologies on the overlapping tunnels are summarized. It is concluded that the construction of the overlapping tunnels of Line 9 and Line 6 of Shenzhen Metro in the same stage will reduce the risks of the construction of Line 6 in the future.