Energy Absorption Characteristics of Frozen Soil Based on SHPB Test

Abstract

Dynamic compressive tests are performed in three frozen soil types under different stress states at freezing temperatures of −5°C and −15°C with impact loading pressures from 0.3 MPa to 0.6 MPa. The effects of frozen soil type, freezing temperature, impact loading pressures, and stress states on incident energy and energy absorption characteristics, such as absorbed energy and energy absorbency rate, are investigated. The experimental results show that most of the incident energy is reflected back to the incident bar, and incident energy linearly increases with the increase of impact loading pressures. Both absorbed energy and energy absorbency rate are found to be negatively correlated with freezing temperature, and there values under confining pressure state are larger than that under uniaxial 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.

Investigation on the Effects of Prefabricated Crack and Strain Rate on Uniaxial Compressive Properties of Frozen Silty Soil

“…where E 0 , A 0 , C 0 , A s , l s are Young's modulus, the crosssectional area, the elastic wave speed of the bar, and the cross-sectional area and height of frozen silty soil specimen, respectively; ε I (t), ε R (t), and ε T (t) are the incident strain, reflected strain, and transmitted strain, respectively; and t is the duration time of elastic wave. Previous investigation indicated that the absorbed energy density (W) could reflect the energy dissipation characteristic of frozen soil under impact loading [38], which could be calculated by…”

SHPB test analysis and a constitutive model for frozen soil under multiaxial loading

“…The parameters related to the damage evolution of soil matrix can be determined by the methods used in authors' previous work (Cao et al., 2018), and are summarized as follows.…”

“…They then demonstrated that the dynamic mechanical properties of clay in high pressure consolidation are sensitive to strain rate, while parameters such as dynamic strength and failure strain are significantly improved. Ma et al. (2018) performed dynamic compressive tests on three types of frozen soil under different stress states in order to investigate the effects of soil type, freezing temperature, impact loading pressures, and stress states on the incident energy and energy absorption characteristics, such as the absorbed energy and energy absorbency rate.…”

Dynamic Mechanical Properties and Failure Mode of Artificial Frozen Silty Clay Subject to One-Dimensional Coupled Static and Dynamic Loads

“…Absorbed energy density (W) is one of the most important parameters in frozen soil crushing engineering [29]. e absorbed energy density under different axial compressive stress ratios are calculated based on equation 4, as shown in Figure 13.…”