A long term resilient modulus rate dependent model for coarse fine mixtures geomaterials under freezing and thawing cyclic

The cyclic loading frequency (f(cyc)) effects on the resilient modulus (M-r) of freezing-thawing coarse-fine mixtures geomaterials (FTCFG) have always been a research hotspot. A series of long-term cyclic triaxial tests were conducted on FTCFG having different fines content (FC) under different number of freeze-thaw cycles (N-FT) to investigate the effect of f(cyc) and deviator stress amplitude (q(cyc)) on the M-r of FTCFG. The freezing-thawing cyclic was found to improve the M-r of FTCFG. Additionally, M-r of FTCFG shown an obviously rate-dependent characteristics. Then three kinetic effects (rate effect, piston effect, and fatigue effect) are discussed in systemically which are related to q(cyc), f(cyc) and moisture holding capacity (w(h)). Finally, a rate dependent model of long-term resilient modulus was developed to predict FTCFG materials' resilient moduli as a function of q(cyc), f(cyc) and w(h). The comparisons between the calculation and experimental results reveal that the present model describes the M-r of FTCFG well.