Research on Trenching Technology for Ultra-Deep Diaphragm Wall Under Complex Geological Conditions
The trenching of ultra-deep diaphragm wall has the characteristics of poor trenching quality,low trenching efficiency and high trenching cost when crossing bad engineering geology.It has a significant impact on the later excavation and stability of the foundation pit,as well as the quality of the main structure.This paper focuses on the construction of underground continuous wall under complex geological conditions in Dongdaqiao Station of Beijing Subway Line 28.The high-efficiency trenching equipment has been determined,and the technical measures for accurately controlling the verticality of the trench wall have been proposed.Management measures for the combined operation of the trenching equipment have been summarized.It solves a series of problems existing in the construction,such as not being able to form grooves quickly under complex geological conditions,low accuracy of groove wall verticality,and high construction safety risks.
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