Study on stress simulation of concrete floor on transversely isotropic equivalent pile foundation during construction period

¹ College of Water Conservancy and Hydropower Engineering, Hohai University, 210098 Nanjing, China
² Zhejiang Water Conservancy and Hydropower Construction Holding Development Co., 310020 Hangzhou, China
³ College of Civil Engineering, Xijing University, 710123 Xi’an, China

^* Corresponding author: sqiang2118@hhu.edu.cn

Abstract

In the concrete pouring process of large pumping stations, the pile foundation plays an important role in supporting the upper structures, and also has a certain constraint on the concrete floor. In the numerical simulation calculation of construction period, to simplify the pre-processing, the volume ratio method is sometimes applied to regard the pile and surrounding soil foundation as the equivalent pile foundation, while the anisotropy of pile foundation is ignored, which will result in large calculation error of the horizontal stress of the concrete floor. Aiming at this problem, the anisotropy theory of materials is adopted in this paper to simulate the temperature field and stress field of the concrete floor both on non-equivalent pile foundation and equivalent pile foundation during construction period after compiling corresponding calculation program. The results show that when the ratio α of the horizontal elastic modulus to the vertical elastic modulus of equivalent pile foundation is about 1/20, the calculation result of the transversely isotropic equivalent pile foundation is approximately equal to the calculation result of the non-equivalent pile foundation (exact solution). It may provide some reference to similar engineering numerical simulation.