Abstract
The trenching process of ultra-deep diaphragm walls under water-rich geological conditions suffers from defects including low construction efficiency, high construction costs, and severe water leakage, which significantly affects subsequent foundation pit excavation and stability as well as main structure quality. Addressing diaphragm wall construction under complex geological conditions at Dongdaqiao Station of Beijing Rail Transit Line 28, this study analyzes the technical characteristics of steel section joints and milling joints, proposes a mechanism for joint water leakage, summarizes the theoretical basis for joint type selection, and resolves the difficulty in selecting joint types arising from low efficiency and high cost of joint construction under water-rich geological conditions, coupled with uncertain water stopping effectiveness at joint locations.
Full Text
Research on the Selection of Ultra-Thick Diaphragm Wall Joints Under High Water Pressure
ZHANG Yanlei
China Railway 16th Bureau Group Co. Ltd., Beijing 100018, China
Abstract
The trenching process of ultra-deep diaphragm walls in water-rich geological conditions suffers from deficiencies such as low construction efficiency, high costs, and severe water leakage, which seriously affect subsequent foundation pit excavation and stability as well as main structural quality. This research, focusing on diaphragm wall construction under the complex geological conditions at Dongdaqiao Station of Beijing Rail Transit Line 28, analyzes the technical characteristics of steel joints and milling joints, proposes the water leakage mechanism at joints, and summarizes the theoretical basis for joint selection, thereby solving the challenge of selecting joint types due to low efficiency, high costs, and unclear waterproofing effects at joint locations in water-rich geological conditions.
Keywords: diaphragm wall; water-rich geology; steel joint; milling joint; selection