1. Department of Airfield and Building Engineering, Air Force Engineering University Engineering College, Xi’an 710038, China);(2. School of Mechanics and Civil Architecture, Northwest Polytechnic University,Xi’an 710072, China
Abstract：In order to investigate rock’s dynamic compression mechanical capabilities, the amphibolites were subjected to impact with different confining pressure (0~6MPa) and strain rate (50~170s-1) by using the split Hopkinson pressure bar (SHPB) of 100mm diameter with confining pressure device and a thin red copper circular plate as pulse shaper, and the validity of SHPB experiment was analyzed. Experimental results show that the dynamic compressive strength and specific energy absorption of amphibolites are strain-rate dependent, the strain-rate effect can be expressed by linear approximations, the failure strain of rock increase with the strain-rate, and the relationship between dynamic strength increase factor and logarithm of strain-rate is approximately linear. The strengthening effect and toughening effect gets more prominent with the increase of confining pressure at same range of strain rate. Under confining pressure and dynamic loads, rock takes compress-shearing damage as the principal failure mode. In SHPB of the amphibolites are tested, the proportion is about 69.5 that loads time at nearly constant strain rate, which can fulfill the requests of stress equilibrium and load at nearly constant strain rate comparatively well. Demonstrate that the SHPB tests are effective and the results of amphibolites are reliable
刘军忠;许金余;;吕晓聪;张磊;王泽东. 主动围压下岩石的冲击力学性能试验研究[J]. , 2011, 30(6): 120-126.
LIU Jun-zhong;XU Jin-yu;;LV Xiao-cong;ZHANG Lei;WANG Ze-dong. Experimental study of rock mechanical capabilities under impact loading with confining pressure . , 2011, 30(6): 120-126.
2011, Vol. 30 
