With the increasing size of open caisson foundation in large bridge project in China

the overall settlement of large open caisson foundation is vital to the shape control of high-speed railway bridge. In this paper

by taking the open caisson foundation of long-span and rail-cum-road Changtai Yangtze River Bridge as the engineering background

the overall settlement of the sinking well foundation during the Changtai Yangtze River Bridge construction stage is comprehensively analyzed. In addition

based on the distribution of the stratum and the size of open caisson foundation

the corresponding centrifuge model tests are conducted. According the results of tests

it can be seen that the overall settlement of open caisson foundation can be divided into three stages: slow growth

sharp deformation and leveling off. In addition

the overall settlement calculated by the layered sum method with actual compression modulus of the soil is in good agreement with that of the centrifugal model test and the overall settlement of the open caisson foundation is about 220 mm when the construction stage is finished. This study provides an important reference for the design of open caisson foundation of Changtai Yangtze River Bridge and has referential value to similar open caisson foundation engineering.