土压平衡盾构双线隧道施工引起的地表沉降规律研究

Investigation of Ground Surface Settlement in Construction of Parallel Double-tube Tunnel with Earth Pressure Balancing Type of Shielding

盾构法作为地铁隧道施工的一种主要施工方法已在我国得到了广泛的应用,由施工引起的地层移动和地表沉降是盾构隧道设计和施工中非常关注的问题。以广州地铁三号线某盾构区间的两条水平平行隧道为研究对象,运用三维有限差分法对盾构隧道施工引起的地层移动和地表沉降进行了较为系统的研究,得出了两条盾构隧道开挖面距离、注浆压力的大小对地表沉降的影响规律,取得了一些新的认识和具有实用价值的研究成果。

The shield driving method, as one of the main construction methods of metro tunneling, has been used widely in China. The soil displacement and ground surface settlement induced by construction is the main issue during shield tunnel design and construction. This paper takes a double-tube parallel shield tunneling section in Guangzhou metro line 3 as the object of study and the soil displacement and ground surface settlement induced by shield tunnel construction are analyzed completely by using 3D FDM. The effects of different distance of excavation face of two adjacent tunnels and the grouting pressure of the second tunnel to the ground surface settlement are concluded during the construction process of shield tunneling. Some new understanding and practical value are achieved through the research.