Research on Ottosen constitutive model of frozen soil under impact load

• Published in: International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 137; p. 104544
• Main Authors: Zhu, Zhiwu, Fu, Tiantian, Zhou, Zhiwei, Cao, Chenxu
• Format: Journal Article
• Language: English
• Published: Berlin Elsevier Ltd 01.01.2021; Elsevier BV
• Subjects: Constitutive models; Dynamic characteristics; Failure; Failure analysis; Failure mechanisms; Freezing; Frozen ground; Impact loads; Mathematical models; Mechanical analysis; Moisture content; Rate sensitive; Sandy soil; Soil dynamics; Soil mechanics; Soil water; Soils; Split Hopkinson pressure bar; Split Hopkinson pressure bars; Stress-strain relation; Water content; Stress-strain relation; Rate sensitive; Split Hopkinson pressure bar; Sandy soil; Failure
• ISSN: 1365-1609; 1873-4545
• DOI: 10.1016/j.ijrmms.2020.104544

Impact blasting loading is an unavoidable problem in cold area construction. In this study, the dynamic characteristics of frozen soil with a water content of 20% and different freezing temperatures are studied under the impact of a spilt Hopkinson pressure bar. Two aspects of the dynamic mechanical response are analyzed to describe the experimental results: temperature rises and the failure mechanism. A rate damage equation is derived considering the improved Ottosen model and thermal activation theory. The experimental results indicate that the improved nonlinear model can be applied to understand the impact mechanics of frozen soil and predict the evolution law of typical mechanical indexes. •Frozen soil is a rate-dependent and temperature-sensitive material.•A damage constitutive model of frozen soil is established.•The strain rate enhancement term is introduced into the model.•The strain rate and temperature affect the impact ultimate failure form of frozen soil.•The theoretical results match well with the experimental ones.