Experimental study on quasi-one-dimensional strain compression of calcareous sand

Abstract

The 100 mm split Hopkinson pressure bar was used to study the dynamic mechanical properties of the calcareous sand confined by confinement at strain rates ranging from 500 to 800 s−1 and pressures ranging from 0 to 200 MPa under different pre-pressures. The static mechanical properties of calcareous sand under the same conditions were investigated in the strain rate of 2×10−3 s−1 and the pressure range of 0−120 MPa by using HUT106D universal material testing machine. It is found that the pre-pressure value has little effect on the mechanical properties of calcareous sand when the load is more than a certain value; Tait equation of state can describe the relationship between hydrostatic pressure and volume strain of calcareous sand in static state and the dynamic state under high pressure; the volumetric compression process of calcareous sand shows a strain rate effect.