双侧基坑施工对地铁隧道变形影响分析

Deformation Analysis on Subway Tunnel due to Construction of Bilateral Foundation Pit

基坑施工会对既有的地铁隧道变形产生不利的影响.基于硬化土本构模型理论,采用流固耦合分析方法,对上海前滩大型商业区25-1号地块在双侧基坑施工下的地铁隧道变形进行了模拟分析.首先结合实测数据对比验证了该模型能很好的模拟基坑工程活动对地铁隧道变形的影响,然后基于该模型模拟预测了地铁隧道在基坑后续施工影响下变形的发展情况,并针对变形预测结果提出了相应的建议,为后续施工和地铁安全保护提供了参考.

The construction of the foundation pit has an adverse effect on the deformation of the existing subway tunnel.Based on the constitutive theory of hardened soil and the fluid structure interaction analysis method,the deformation of a subway in Shanghai under bilateral foundation pit construction is simulated and analyzed. Compared with the field data,the reasonableness of the model is verified to simulate the deformation of metro tunnel caused by the excavation of foundation pit,and then based on the model simulation,the development of subway tunnel deformation is predicted under the influence of the subsequent construction. Some corresponding suggestions are placed by the deformation prediction results,which provides references for the subsequent construction and safety of subway protection.