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| Comparative experimental study on dynamic mechanical properties of bedded salt rock and mudstone interbed |
| WANG Jian1，LI Erbing1，TAN Yuehu1，YOU Yechao1，2 |
(1. College of Defense Engineering，PLA University of Science and Technology，Nanjing，Jiangsu 210007，China；
2. Jiangsu Transportation Research Institute Co.，Ltd.，Nanjing，Jiangsu 210017，China) |
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Abstract In order to compare the dynamic mechanical characteristics of salt rock and mudstone interbed，the salt rock and mudstone interbed from Yingcheng were studied with the split Hopkinson pressure bar(SHPB) apparatus under triaxial confining pressures of 5，15 and 25 MPa. The formula for the dynamic strength of salt rock and mudstone interbed were derived by data fitting according to a simplified strength-strain rate model on competition between the mechanisms of thermal activation and the macro-viscosity. The results show that the salt rock and mudstone interbed are sensitive to the strain rate，that their peak stress and ductility increase as the strain rate increases，but that the strengthening effect of strain rate under the low confining pressures(such as 5 MPa) is more obvious than that under the high confining pressures(such as 25 MPa). The confining pressure effect on the mechanical behavior of salt rock and mudstone interbed under the dynamic loading condition is less obvious than that under the static loading condition. The dynamic increasing factor(DIF) decreases as the confining pressure increases，and the confining pressure effect of mudstone interbed is smaller than that of salt rock. The formula for dynamic strength fits data well with the average relative errors of 2.51% and 6.58% for salt rock and mudstone interbed respectively.
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2017, Vol. 36 
