Research on Dynamic Response and Energy Consumption Law of Fissured Sandstone Under Impact Load
In order to investigate the dynamic mechanical properties and damage mode of rocks containing fissures,as well as the energy dissipation law of the impact crushing process,intact sandstone specimens and five sets of sandstone specimens with different prefabricated fissure angles were selected,and dynamic impact tests were carried out using split Hopkinson pressure bar(SHPB).The test results show that the fissures will deteriorate the impact resistance of the specimens,with the increase of the fissure angle,the dynamic compressive strength of the fissured specimens is greater,and the mechanical properties of the specimens with fissure angle of 90° are closest to the intact specimens.The specimens are mainly damaged by tensile splitting and impact crushing,and the different fissure angles do not affect the final damage of the specimens.As the fissure angle increases,the ratio of reflected energy to incident energy of the specimens gradually decreases,and the ratio of transmitted energy to incident energy gradually increases,and there is no obvious relationship between the energy dissipation rate and the angle.
万方数据
维普
