Energy absorption characteristics of cement-soil under confining pressure based on SHPB test

Abstract

Cement-soil has been widely used for engineering application. However, no attention has been paid to the energy absorption characteristics of cement-soil under impact loading. In this paper, a series of split Hopkinson pressure bar (SHPB) tests have been conducted to explore the energy absorption characteristics of cement-soil, and the effects of confining pressure (from 0 to 2.0 MPa) and strain rate (from 130 to 172 s-1) on the absorbed energy and the energy absorbency rate are investigated. The results show that the energy evolution of cement-soil under confining pressure is found to be similar at different strain rate. Both the absorbed energy and the energy absorbency rate are influenced by the confining pressure. Moreover, both the absorbed energy and the energy absorbency rate increase at first and then remain stable at a certain value with the increase of confining pressure. In addition, the absorbed energy linearly increases with the incident energy increasing, and a similar tendency is found between the absorbed energy and the strain rate, yet no obvious effect on the energy absorbency rate by the strain rate. Moreover, the energy mechanism of cement-soil is explained from the perspective of failure modes of cement-soil specimen.

Stress wave propagation characteristics and energy dissipation effects in sandy soil

“…Lv et al [15] proposed a model to quantify the impact of strain rate, relative density, and water content on the fragmentation rate of porous angular calcareous sand, focusing on its fractal characteristics under impact loading. Additionally, a few cases have reported on the dynamic mechanical response of kaolinite [16], frost-expanded soils [17][18][19], and loess [20].…”