A computational method for post-construction settlement of high-speed railway bridge pile foundation considering soil creep effect

FENG Sheng-yang(冯胜洋), WEI Li-min(魏丽敏), HE Chong-yang(何重阳), HE Qun(何群)

(School of Civil Engineering, Central South University, Changsha 410075, China)

Abstract:Based on reasonable assumptions that simplified the calculational model, a simple and practical method was proposed to calculate the post-construction settlement of high-speed railway bridge pile foundation by using the Mesri creep model to describe the soil characteristics and the Mindlin-Geddes method considering pile diameter to calculate the vertical additional stress of pile bottom. A program named CPPS was designed for this method to calculate the post-construction settlement of a high-speed railway bridge pile foundation. The result indicates that the post-construction settlement in 100 years meets the requirements of the engineering specifications, and in the first two decades, the post-construction settlement is about 80% of its total settlement, while the settlement in the rest eighty years tends to be stable. Compared with the measured settlement after laying railway tracks, the calculational result is closed to that of the measured, and the results are conservative with a high computational accuracy. It is noted that the method can be used to calculate the post-construction settlement for the preliminary design of high-speed railway bridge pile foundation.

Key words:high-speed railway; bridge pile foundation; post-construction settlement; Mesri creep model; simplified computational method