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Energy absorption characteristics of frozen soil based on SHPB test

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Document pages: 9 pages

Abstract: Under different stress states, dynamic compression tests at freezing temperature of − 5 ° C and − 15 ° C were carried out on three kinds of frozen soil, and the impact load pressure was 0.3   MPa to 0.6   MPa. The effects of frozen soil type, freezing temperature, impact load pressure and stress state on incident energy and energy absorption characteristics (such as absorbed energy and energy absorption rate) are studied. The experimental results show that most of the incident energy is reflected back to the incident rod, and the incident energy increases linearly with the increase of impact load pressure. The absorbed energy and energy absorption rate are negatively correlated with the freezing temperature. The absorbed energy and energy absorption rate under confining pressure are greater than those under non confining pressureaxial condition. The effects of confining pressure on absorbed energy are quite different at different freezing temperatures. In addition, frozen soil type also affects absorbed energy and energy absorbency rate. Meanwhile, impact loading pressure shows an increased effect on the absorbed energy, but it has little effect on energy absorbency rate in the research.

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