In order to explore the influence of the increase of tangential stress at different depths of surrounding rock after roadway excavation,an improved split Hopkinson pressure bar(SHPB)test system was used to carry out dynamic and static combined loading tests on sandstone specimens of gold ore in southwest Guizhou under axial compression of 0,10,20,30 and 40 MPa,aiming to analyze the mechanical behavior,deformation characteristics and energy evolution law of sandstone under different axial compression.It is found that the stress-strain curve of the specimen under dynamic and static combined loading is divided into compaction stage,elastic stage,plastic failure stage and post-peak stage.Axial compression makes the peak strain increase gradually and the ultimate strain decrease gradually.The dynamic elastic modulus,dynamic compressive strength,strain rate and the evolution of each energy all show the change rule with 10 MPa as the turning point.
关键词
砂岩/动静组合加载/SHPB/岩石动力学
Key words
sandstone/dynamic and static combined loading/split Hopkinson pressure bar/rock dynamics
维普
万方数据