Technical research on shield tunneling across pile foundations
As urban metro construction swiftly develops,the proliferation of metro lines leads to their increasing density.In the process of constructing interval tunnels,piles belonging to existing structures are often encountered.In some cases,these structures lack optimal clearing(piling)conditions,necessitating the shield to pass through them directly.This circumstance intensifies construction challenges and poses increased risks.This article is centered on the engineering context of Nanjing metro line 5,where shield tunneling passes through the Tongjimen municipal highway tunnel and its 1000 mm diameter pile foundation.Focusing on the application of shields passing through tunnel and pile foundations without impacting the operations of existing tunnels,the early stages involve research on shield machine selection,tool configuration,finite element calculation simulation,and other aspects of research.During the actual construction process,the main construction parameters are optimized,and construction measures such as slag improvement and automated monitoring are taken,which could effectively solve the problem of shield tunneling through structures without the possibility of pile extraction.The findings of this article offer crucial insights for resolving similar issues in future metro construction projects.
metro constructionshieldpass throughpilehighway tunnelpile grinding
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