Analysis on dynamic properties and failure characteristics of salt rock based on energy dissipation principle
YOU Yechao1，LI Erbing1，TAN Yuehu1，JIANG Xiquan2，DUAN Jianli1，YANG Meng1
(1. College of Defense Engineering，PLA University of Science and Technology，Nanjing，Jiangsu 210007，China；
2. The No.4 Department，Army Officer Academy of PLA，Hefei，Anhui 230031，China)
Abstract：In order to study the dynamic properties and failure characteristics of salt rock，the split Hopkinson pressure bar(SHPB) apparatus was used to conduct impact tests of salt rock under the confining pressures of 5，15 and 25 MPa. The dynamic properties and failure characteristics were studied based on the energy dissipation principle. The energy transmitting and transformation in the whole experimental process were analyzed in details，and the effect of the confining pressure and incident energy to the energy absorption and fracture of salt rock were studied specifically. Under the same confining pressure，the hardening effect of salt rock is more obvious with the increase of the incident energy，which can be explained as the reduction of the energy transmission/absorption rate and the increase of reflection rate. At the same or similar incident energy，the flow plasticity of salt rock becomes more obvious with the increase of confining pressure，but the salt rock changes from the flow plasticity to brittle under the dynamic loads and present brittle failure in the end. The peak stresses of salt rock show the different trends with the growth of energy absorption under the different confining pressures. Under the low confining pressures，the greater the energy absorption，the higher the peak stress. The peak stress decreases dramatically with the increasing of energy absorption under the high confining pressures. The impact fracture morphology of salt rock is similar to that of other brittle rocks under the condition of confining pressures，but there are intrinsic differences in damage mechanisms.
尤业超1，李二兵1，谭跃虎1，姜锡权2，段建立1，杨 蒙1. 基于能量耗散原理的盐岩动力特性及破坏特征分析[J]. 岩石力学与工程学报, 2017, 36(4): 843-851.
YOU Yechao1，LI Erbing1，TAN Yuehu1，JIANG Xiquan2，DUAN Jianli1，YANG Meng1. Analysis on dynamic properties and failure characteristics of salt rock based on energy dissipation principle. , 2017, 36(4): 843-851.
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2017, Vol. 36 
