Analysis of creep properties of soft soil subgrade using gravel piles based on Modified Burgers model

摘要

The paper takes Donggang expressway as the engineering background, based on the Burgers model, considering the effects of temperature and water content on the creep properties of rock, the creep damage constitutive model of low temperature rock is established, which can reflect the instantaneous elastic deformation, decay creep, steady creep, accelerated creep and the plastic properties. Using the software FLAC~(3D) to simulate creep properties of soft soil subgrade at Donggang during freezing period, the results show that: reinforcement effect of pile on the soft soil subgrade is quite obvious, the creep settlement and creep rate of soft subgrade treated by gravel pile are obviously reduced. The creep property of watery soil is smaller than that of dry soil, and the lower the temperature, the higher the freezing degree of the rock and soil, the property of creep is the less obvious. Comparative analysis of in-situ monitoring and numerical calculation, the correctness and accuracy of result from numerical calculation can be verified.