Abstract
The trenching of ultra-deep diaphragm walls when traversing adverse engineering geological conditions is characterized by poor trenching quality, low efficiency, and high costs, which exert significant impacts on subsequent foundation pit excavation, stability, and main structural quality. This paper addresses the construction of diaphragm walls under complex geological conditions at Dongdaqiao Station of Beijing Rail Transit Line 28, identifies high-efficiency trenching equipment, proposes technical measures for precise control of trench wall verticality, summarizes management protocols for combined equipment operations, and resolves a series of construction challenges including inability to trench rapidly under complex geological conditions, low precision of trench wall verticality, and high construction safety risks.
Full Text
Preamble
Research on Trenching Technology for Ultra-Deep Diaphragm Wall Under Complex Geological Conditions
XU Futian
China Railway 16th Bureau Group Co. Ltd., Beijing 100018, China
Abstract
Ultra-deep diaphragm wall trenching in unfavorable geological conditions is characterized by poor trenching quality, low efficiency, and high costs, which significantly impact subsequent foundation pit excavation, stability, and main structure quality.
Focusing on the diaphragm wall construction at Dongdaqiao Station of Beijing Rail Transit Line 28 under complex geological conditions, this study identifies efficient trenching equipment, proposes technical measures for precise control of wall verticality, and summarizes management protocols for combined equipment operations. These integrated solutions effectively resolve critical construction challenges, including slow trenching progress in complex strata, inadequate verticality precision, and elevated safety risks.
Keywords: diaphragm wall; complex geological conditions; trench wall stability; verticality