上海市轨道交通9号线盾构上穿1号线影响分析

Influence of Rail Transit Line 9 Tunneling over Line 1 in Shanghai

上海市轨道交通9号线盾构在推进至衡山路天平路附近时,上穿运营中的轨道交通1号线。两线隧道之间的最小垂直净距仅约1.1 m,而覆土厚度只有4.25 m。9号线穿越施工一方面必须严格控制地面隆起或沉降,另一方面还必须控制运营中的1号线隧道的上浮和变形情况。利用ANSYS软件对该穿越工况进行了三维仿真,分析了9号线隧道穿越施工对1号线的影响及施工过程中的地表变形;同时提出了相应的技术措施,如设置抗浮板,严格控制盾构的设定平衡压力、注浆量、注浆压力、出土量等参数,进行同步注浆和二次注浆,实施信息化施工等。

The shield of Shanghai rail transit Line 9 will traverse the tunnels of Line 1 near Hengshan Road and Tianping Road.The minimum net vertical distance between two tunnels of Line 9 and Line 1 is only about 1.1 meters and the thickness of the covering soil is about 4.25 meters.During the construction,the ground upheaval and settlement must be controlled strictly,at the same time the deformation and floating of the tunnels of Line 1 must be controlled.In this paper,ANSYS software is used to simulate this trave...