为降低富水软土地层盾构穿越施工对既有运营地铁车站的扰动风险，以某T型换乘站盾构穿越运营站施工为工程背景，采用理论分析和现场实测等方法，研究盾构切割未预留玻璃纤维筋地连墙的刀具配置及推进参数，并提出下穿运营站的重点风险控制措施。结果表明：采用不同刀高配合的高强度贝壳刀、降低推进速度与盾构推力，加大刀盘扭矩，能实现盾构安全穿越地连墙；将运营站底板与地层的相互作用力作为下穿施工时的附加荷载，以盾构中心处的静止土压力提高1.2倍作为土仓压力设定值可减少对底板的扰动；采用克泥效充填盾壳与地层的空隙，以及同步注浆、二次注浆与径向注浆组合方式充填管片背后的建筑空隙，可很好的控制既有结构沉降；盾构下穿运营站施工引起的变形以沉降为主，盾构切割地连墙施工以水平变形为主，占总水平位移的75％以上。

In order to reduce the disturbance to the existing metro station caused by shield tunneling in water-rich soft stratum, taking the construction of a T-type transfer station with shield tunneling passing through the operation station as the engineering background, the cutter configuration and tunneling parameters of the shield tunneling cutting the diaphragm wall without glass fiber reinforcement are studied by theoretical analysis and field measurement, and the key risk control measures of the shield tunneling passing through the operation station are proposed. The results show that the shield can pass through the diaphragm wall safely by using high strength shell cutters with different cutter heights, reducing the tunneling speed and thrust of the shield, and increasing the torque of the cutter head, and that the disturbance to the floor can be reduced by taking the interaction force between the floor of the operation station and the stratum as the additional load during the construction of the underpass and taking the static soil pressure at the center of the shield increasing by 1.2 times as the set value of the chamber pressure; The settlement of the existing structure can be well controlled by filling the gap between the shield shell and the stratum with clay shock, and filling the building gap behind the segment with the combination of synchronous grouting, secondary grouting and radial grouting; The deformation caused by the construction of shield undercrossing operation station is mainly settlement. The deformation caused by the construction of shield cutting diaphragm wall is mainly horizontal displacement, accounting for more than 75% of the total horizontal displacement.

中国国家铁路集团有限公司科技研究开发计划重点课题（N2020G009）