Investigation of an Empirical Creep Constitutive Model of Changsha Red Loam

Abstract

To describe and predict the creep deformation of Changsha red loam (including sandy soil and silty clay) in China, an empirical creep model was proposed based on a laboratory consolidation compression test. Two classical soil layers were sampled from the deep foundation pit site and fourteen samples were designed for tests under different loading conditions. Results show that the deformation process illustrates deceleration and stabilization creep with its vertical load lower than 500 kPa, while it may illustrate acceleration with its vertical load higher than 500 kPa. By analyzing the experimental results, the empirical creep model of the red loam was established. Adopting the model to predict the deformation of red loam shows the prediction curves match the actual situation, proving that the model plays a significant role in predicting the creep deformation of Changsha red loam.

Creep Characteristics of Reconstituted Silty Clay under Different Pre-Loading Path Histories

“…In previous studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], undisturbed and reconstituted soil samples were tested to investigate their creep behaviors under different loading paths, stress levels, etc. Also, influential factors, such as temperature and strain rate, were identified [21][22][23][24].…”

“…These observations underscore the influence of structure on clay's creep behavior. Various empirical creep models were proposed to describe the rheological behaviors of cohesive soils [17][18][19][25][26][27][28][29][30][31]. For example, Yin [29] proposed a widely employed logarithmic empirical model based on laboratory one-dimensional compression triaxial tests, and Singh et al [30] proposed a power function model.…”

“…Xiao et al [17] proposed an empirical hyperbolic creep model based on the triaxial shear creep test of saturated clay in Hangzhou City, with a clear physical meaning for parameters and a good fitting effect. Long et al [18], utilizing consolidation creep tests, examined the creep characteristics of Changsha red clay and formulated an empirical model that accurately forecasts creep behavior under loads of up to 500 kPa. Concurrently, Niu et al [19], through triaxial testing, explored the dynamic creep properties of frozen silty clay and developed a non-constant fractional dynamic creep model grounded in fractional calculus.…”