Dynamic stress–strain behavior of frozen soil: Experiments and modeling: Fid-Bau Portal

Dynamic stress–strain behavior of frozen soil: Experiments and modeling

Xie, Qijun / Zhu, Zhiwu / Kang, Guozheng

Abstract The dynamic stress–strain behavior of artificial frozen soil (with a moisture content of 30%) was tested using a split Hopkinson pressure bar (SHPB) under various impact compressive loading conditions. The tests were performed at strain rates 400–1000s⁻¹ and different temperatures (i.e., −3, −8, −18, and −28°C). The experimental results show that the dynamic stress–strain responses of the artificial frozen soil exhibit a positive strain rate sensitivity and negative temperature dependence. An energy-based dynamic constitutive model was constructed to simulate the dynamic stress–strain behavior of the frozen soil. It is shown that the proposed model can describe the positive strain-rate sensitivity and negative temperature dependence of the artificial frozen soil reasonably, and predict the dynamic stress–strain curves of the frozen soil well.

Highlights • We use SHPB device conducted dynamic experiments on frozen soil. • We studied dynamic mechanical properties of frozen soil at different temperatures. • We propose a new idea to establish the dynamic constitutive model of frozen soil. • The idea can apply to establish dynamic constitutive model of other materials. • This model is suitable for high strain rates.