Research on damage viscoelastic dynamic constitutive model of frozen soil

Abstract

Abstract The dynamic stress-strain curves of frozen soil (with a moisture content of 15%) are obtained with the spilt Hopkinson pressure bar under uniaxial stress conditions. The tests are executed at freezing temperatures of −5\u202f°C, −10\u202f°C and\u202f−\u202f15\u202f°C and with the strain rates ranging from 300\u202fs−1 to 900\u202fs−1. The experiment results show that the dynamic mechanical properties of the frozen soil exhibit a rate-dependence, temperature sensitivity, and damage softening characteristics. A viscoelastic constitutive model with temperature sensitivity is established based on the test results. The theoretical results are very close to the experimental results and the proposed dynamic constitutive model is found to be practical. The proposed model accounts for the strain-rate dependence and temperature sensitivity of the frozen soil.