The Influence of Double-line Interval Shield Tunnel Construction on Surrounding Ground Surface and Building Settlement in Soft Soil Area
The purpose of this paper is to study the influence of double-line interval shield tunnel construction between East Jiangchuan Road Station and Zilong Road Station in Shanghai on the surrounding ground surface and building settlement.The engineering is located in an important geographical position and passes through the mucky soft soil layer,especially the mucky clay and other soft soil layers,which brings great challenges to the construction.The diameter of the shield tunnel is φ6 760 mm,and the earth pressure balance shield machine is used for construction.Through geological survey and evaluation,two shield machines THDG-17191 and THDG-17192 are selected,and the shield posture is strictly controlled to deal with the problems of low bearing capacity,high compressibility and fluidity in mucky soft soil.By taking measures such as optimizing tunneling parameters,accurately controlling soil bin pressure,and timely synchronous grouting,the ground surface settlement and segment floating can be effectively reduced.
soft soil areashield tunnel constructionsurface building settlement
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