SHPB experimental study of mortar simulating fractured rock under static and dynamic load combination
- ZHANG Wei, LI Haitao, WANG Jian, WANG Li
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(6):
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In order to study the dynamic response of fractured rock under the conditions of different cracks and confining pressures, precast fractured mortar specimens were employed to simulate the actual fractured rock. In the mold precast plastic sheet were installed to simulate the actual rock fissure angle and the penetration rate, and the confining pressure was simplified to normal metal ring fixture. Based on the orthogonal experiments, the dynamic response on mortar specimens under different confining pressures in different angle of tilt(0°, 30°, 45°, 60°, 90°)and different penetration rates(100%, 75%, 50%, 25%, 0%)was studied by SHPB test device. The results showed that when the angle was less than 45°, the specimen stability increased with reduced angle of fracture, when the angle exceeded 45°, the stability increased with increased angle of fracture, 45° angle of tilt was the critical point of the stability; stability had non-linear relationship with the inclination; the increasing of the penetration rate significantly reduced dynamics strength of specimens; confining pressure made mortar specimens produce a pseudo-plastic deformation, which could effectively improve the dynamic stability especially for high penetration rate of the specimen. The results provided a reference for the analysis of the underground engineering of fractured rock mass.