Deformation in settlement and grouting remediation of thickened larger-diameter metro shield tunnel in soft soil: A case study

Deformation in settlement and grouting remediation of thickened larger-diameter metro shield tunnel in soft soil: A case study

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Shield tunnels built in soft soil are Insect Repellent prone to settlement, which is often accompanied by convergence deformation, further resulting in a series of damages to the tunnel structure and compromise its safety in service.This paper presents an engineering case on the settlement development and internal drilling grouting remediation of a tunnel section in Shaoxing Metro Line 1, where the inner diameter and thickness of the tunnel linings are increased to be 5.9 m and 400 mm simultaneously.The tunnel settlement arises from a comprehensive analysis of several contributing factors, encompassing ground disturbances such as pile driving, pile extraction, backfilling of pile holes, road structure construction, and road traffic.

A grouting remediation plan is thoughtfully designed, including a careful assessment on the necessity for a temporary steel support system which is based on a full-scale three-ring test of the tunnel structure.The deformation of the tunnel during settlement and grouting processes is thoroughly analyzed to investigate the deformation resistance capacity exhibited by the thickened larger-diameter tunnel.The case study and experimental results Outdoor Pub Table w/FP demonstrate that tunnel structures with an increased diameter and thickness have better deformation resistance than conventional metro tunnels in soft soil layers.The analysis of this study can provide a reference for tunnel structures optimization and similar grouting remediation projects in shield tunnels.