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Abstract

The round-ended stepped caisson adopted by Pier 5 # of the Changtai Yangtze River Bridge is the world’s largest-sized underwater steel caisson. This paper monitored and analyzed the entire construction process of caisson 5 # through on-site monitoring data and relevant theoretical methods. Meanwhile, it studied the lateral distribution of lateral friction resistance, the influence of earth pressure on the outer edge foot tread surface on end resistance, and the stress distribution at the bottom of the partition wall. The research results show that a good posture of the caisson can be guaranteed through timely dynamic adjustment. After the pouring of the first section of concrete in the caisson is completed, the stress magnitude and distribution of the bottom plate of the outer partition wall have been determined. However, the stress of the inner partition wall will increase significantly in the early stage of construction and remain stable in the middle and later stages. During the middle and later construction of the caisson, the end resistance at the foot tread surface of the outer edge accounts for 35%–55% of the total end resistance of the outer edge and 25%–40% of the total resistance at the end of the caisson, which has a significant impact on the settlement of the caisson. When the sinking of the caisson is initiated, the earth pressure at the foot surface of the outer edge will change significantly. Moreover, in the initial sinking stage of the caisson, the static frictional resistance is approximately 1.1 times the dynamic frictional resistance. In the final sinking stage of the caisson, the static frictional resistance is approximately 1.6 times the dynamic frictional resistance. The lateral wall earth pressure is between the active total pressure and the passive total pressure. Meanwhile, the lateral wall earth pressure first increases, then stabilizes, and then decreases, but the decreasing trend is not obvious. The lateral distribution of the lateral wall frictional resistance varies greatly and should be calculated in segments.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.027

First Page

149

Last Page

155

Submission Date

May 2025

Reference

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