In order to study the dynamic strength of salt rock，taking Yingcheng salt rock of Hubei province as research object，self-developed split Hopkinson pressure bar(SHPB) apparatus with triaxial confining pressure was used to study the dynamic compression property of salt rock under 5MPa and 15MPa confining pressure. Dynamic stress-strain curves of salt rock under different confining pressure and strain rate were obtained. Based on a unified strength-strain rate model of competition between thermoactivational mechanism and the macro-viscosity mechanism，combined with the results of SHPB test data，a formula was derived to calculate the dynamic strength of rock salt under different confining pressures，and the formula was validated by the measured data. The results show that：(1)the peak stress and ductility of salt rock presents remarkable strain rate and confining pressure effect under impact compression loading，the peak stress increases with the strain rate increases，and the confining pressure has a significant effect on peak stress and salt rock ductility；(2)the fitting effect of the formula for calculating dynamic strength of rock salt is satisfactorywith minor error，the average relative error is 2.8%，the maximum relative error is 7.8%，which provide reference for the research of salt rock dynamic strength.
李二兵1，谭跃虎1，马 聪1，姜锡权2，段建立1，杨 蒙1 . 三向压力作用下盐岩SHPB试验及动力强度研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3742-3749.
LI Erbing1，TAN Yuehu1，MA Cong1，JIANG Xiquan2，DUAN Jianli1，YANG Meng1. Split Hopkinson Pressure Bar Test and Dynamic Strength Research of Salt Rock Under Three-Pressure. , 2015, 34(S2): 3742-3749.
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2015, Vol. 34 
