Experimental study on marble with cyclic dynamic disturbance under different stress amplitudes

In order to study the mechanical properties and damage regularity of marble with cyclic dynamic disturbance under different stress amplitudes, the tests are carried out of marble which is at the roof of Dongguashan copper mine under different stress amplitudes.The disturbance frequency is 5 Hz.The stress amplitude has a significant effect on the mechanical properties of marble under cyclic disturbance.When the stress amplitude is 30 MPa, the specimen is not destroyed under multiple cyclic dynamic disturbances, and the elastic modulus strengthening effect appeared in the process of progressive loading.With the increase of the stress amplitude, a number of cyclic dynamic disturbances decrease significantly.When the stress amplitude is 30 MPa and 60 MPa, the specimen is shear failure.When the stress amplitude is 90 MPa, fragmentation and ejection occurred locally in the sample.The damage variation law of marble samples under different stress amplitudes is studied by the established strain damage model.