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Abstract To ensure the security of the Yangtze River levee nearby，the deflection of the diaphragm wall of the round foundation pit for the south anchorage of Wuhan Yangluo Yangtze River Highway Bridge must be strictly controlled. So after the brief presentation of the construction process of the project，factors that contribute to deflection of the diaphragm wall are examined；and three parameters，namely depth of excavation layers，thickness of inner lining and width of excavation part，are recognized as the main factors. Then grey-correlation theory is applied to analyze the correlation between these parameters and deflection of the diaphragm wall. It is shown that depth of excavation layers and width of excavation part have more influence than thickness of inner lining. Therefore，to restrict the deflection of the diaphragm wall，it is more efficient and economical to adjust the depth of excavation layers and/or the width of excavation part than to increase the thickness of inner lining. The analysis method and the conclusion can be applied to this project and other similar projects.
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Received: 11 February 2004
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