Abstract
As a critical stage in shield method construction, large-diameter shield arrival technology involves complex processes with substantial risks. To mitigate potential hazards such as water seepage, sudden inrush, cracking, and settlement during shield reception in shallow overburden and highly permeable strata, this paper, based on the Chunfeng Tunnel project case, elaborates comprehensive measures encompassing working shaft end reinforcement, reception guide platform, steel sleeve reception, portal sealing device installation, and shield reception parameter control. These integrated measures effectively address major risk issues that may arise during large-diameter shield reception under shallow overburden and highly permeable strata conditions, thereby ensuring successful reception of large-diameter slurry shields in such geological settings.
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Preamble
Study on Key Technologies for Super-Large Diameter Shield Arrival in Coastal Composite Strata
Zhang Rui, Diao Xianqian
Guangzhou Metro Engineering Consulting Co., Ltd., Guangzhou 510000, China
Abstract
Super-large diameter shield arrival technology constitutes a critical yet highly complex and risk-intensive phase in shield tunneling construction. To mitigate risks such as water seepage, sudden inrush, ground cracking, and settlement during shield reception in shallow overburden and highly permeable strata, this paper presents a comprehensive set of measures based on the Chunfeng Tunnel project case study. The discussed measures encompass working shaft end reinforcement, receiving guide platforms, steel sleeve reception, portal sealing device installation, and shield arrival parameter control. These integrated solutions effectively address major risk issues associated with super-large diameter shield reception under challenging geological conditions of shallow overburden and high permeability, thereby ensuring the successful arrival of super-large diameter slurry shields in such strata.
Keywords: super-large diameter; composite stratum; shield reception; steel (short) sleeve sealing