Dynamic characteristics of copper-bearing serpentine under combined action of one-dimensional static load and frequent disturbances

The dynamic tests of copper-bearing serpentine under one-dimensional static load and frequent disturbances were conducted to study dunamic properties of copper-bearing serpentine adopting an improved SHPB test system for rock static and dynamic combined loading aiming at the problems of high stress concentration and blasting disturbance in deep exploitation of Dongguashan Copper Mine. The results showed that a phenomenon of concave does not appear in the initial stage of the rock's dynamic stress-strain curve when the pre-axial compression makes the rock's internal micro cracks be completely closed, otherwise it appears; when the rock's internal stored elastic force is larger than the disturbance impact stress, the rebound phenomenon appears on the rock's dynamic stress-strain curve after the dynamic stress reaches the peak stress, otherwise it does not appear; with increase in disturbance impact times, the dynamic peak stress and the deformation modulus decrease while the maximum strain and the strain corresponding to the peak stress increase; the peak stress is the maximum when the axial compression is 60 percent of the uniaxial compressive strength; with increase in the axial compression, the average value of the dynamic peak stress increases firstly and then decreases; the maximum and average cumulative disturbance impact times decrease according to a fourth order polynomial with increase in the axial-compression. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.