Abstract
This paper presents the settlement control technology for super-large cross-section rectangular pipe-jacking construction in muddy soil layers, using as a case study the rectangular pipe-jacking section between Provincial Hospital Station and East Gate Station on Fuzhou Metro Line 4, which represents the pipe-jacking tunnel with the maximum span and super-large cross-section in subway intervals. In response to the characteristics of muddy soil layers—their relative softness, poor bearing capacity, and high susceptibility to deformation upon disturbance—construction quality is stringently controlled through aspects including cutter head configuration, jacking parameters, and friction-reducing grouting to minimize ground surface settlement. This methodology provides effective protection for buildings and structures in the urban city center and offers guiding value for subsequent similar engineering practices.
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Preamble
Title: Construction of Large-Section Rectangular Pipe Jacking in Silty Soil Layers
Author: Zhang Lulu¹
Affiliation: ¹Shanghai Tunnel Engineering Co., Ltd., Shanghai 200000, China
Abstract
This paper presents a case study of the largest-span rectangular pipe jacking tunnel in metro applications—the rectangular pipe jacking section between Shengli Hospital Station and Dongmen Station on Fuzhou Metro Line 4—to elaborate on settlement control techniques for large-section rectangular pipe jacking in silty soil layers. Given the characteristics of silty soil layers—relatively soft, poor bearing capacity, and highly prone to deformation when disturbed—strict construction quality control is implemented in aspects such as cutter head configuration, jacking parameters, and friction-reducing grouting to minimize ground surface settlement. This approach provides effective protection for buildings and structures in urban city centers and offers guidance for subsequent similar engineering practices.
Keywords: Large-section; Silty soil; Cutter head configuration; Jacking parameters; Settlement control