李二兵三向压力作用下盐岩SHPB试验与动力强度研究.PDFVIP

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李二兵三向压力作用下盐岩SHPB试验与动力强度研究.PDF

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34 2 Vol.34 Supp.2 2015 9 Chinese Journal of Rock Mechanics and Engineering Sept.2015 SHPB 1 1 1 2 1 1 (1. 210007 2. 230031) Hopkinson (SHPB)515 MPa SHPB 2.8%7.8% Hopkinson (SHPB) TU458 A 2015)2374208 SPLIT HOPKINSON PRESSURE BAR TEST AND DYNAMIC STRENGTH RESEARCH OF SALT ROCK UNDER THREE-PRESSURE 1 1 1 2 1 1 LI Erbing TAN Yuehu MA Cong JIANG Xiquan DUAN Jianli YANG Meng (1. College of Defense EngineeringPLA University of Science and Technology Nanjing Jiangsu 210007China 2. The No.4 Department Army Officer Academy of PLA Hefei Anhui 230031China) Abstract In order to study the dynamic strength of salt rocktaking Yingcheng salt rock of Hubei province as research objectself-developed split Hopkinson pressure bar(SHPB) apparatus with triaxial confining pressure was used to study the dynamic compression property of salt rock under 5 MPa and 15 MPa 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 mechanismcombined with the results of SHPB test dataa formula was derived to calculate the dynamic strength of rock salt under different confining pressuresand 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 compressio