富水粉砂地层盾构隧道穿越河流沉降控制.

How to effectively control the ground loss caused by the shield construction method and the settlement caused by the shield tunneling under the river in the water rich silt sand formation is the key issue of current research. This paper takes the actual situation of crossing the river in the first phase of the Changzhou Metro Line 2 project as an example, combined with ABAQUS to conduct a numerical simulation analysis of the settlement of the shield tunnel underneath the river, and study the method of the shield tunnel method to reduce the settlement in the water rich silt formation. The results show that when the water pressure of the cut is controlled within 1.10-1.15 kPa. the grouting process behind the wall is adopted. each ring advances 4.2-5.8 m³ during the secondary grouting, and the portal interface segment adopts a rigid cast iron ring. The settlement can be effectively controlled to ensure the safety of the shield tunnel crossing the river. The conclusions obtained can give a certain reference for the construction of the shield tunnel under the river. [ABSTRACT FROM AUTHOR]