Experimental study of sandstone mechnical properties and failure model under triaxial SHPB loading
GONG Feng-qiang1,2, LI Xi-bing1,2, LIU Xi-ling1,2
1 School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China;2 Hunan Key Lab of Resources Exploitation and Hazard Control for Deep Metal Mines,Changsha, Hunan 410083, China
Abstract：The dynamic triaxial compression tests of sandstone were conducted with a modified triaxial split Hopkinson pressure bar (SHPB) coupled static and dynamic loads. For the comparison, the quasi-static triaxial compression tests were also conducted with RMT-150C device. The influence of confining pressure to dynamic characteristics of sandstone and the failure model of sandstone in impact tests were focused on in this paper were analyzed based the experimental data.The results show that the dynamic compression strength will increase with the increase of strain rate when the confining pressure is a constant. When the strain rate is a constant, the dynamic compression strength and elastic modulus will increase with the increase of confining pressure. The critical incident energy for rock failure will increase when the confining pressure increases. There is a linear increasing relationship between the energy absorption per unit volume of rock and strain rate. Under the triaxial dynamic impact, there are some compression-shear surfaces inside the rock and the rock will remain steady when the strain rate is low, when the strain rate is high, rock will failure and generate some vertebral-shaped blocks.
宫凤强;李夕兵;刘希灵;. 三轴SHPB加载下砂岩力学特性和破坏模式的试验研究[J]. , 2012, 31(8): 29-32.
GONG Feng-qiang;LI Xi-bing;LIU Xi-ling;. Experimental study of sandstone mechnical properties and failure model under triaxial SHPB loading. , 2012, 31(8): 29-32.
2012, Vol. 31 
