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| Experimental study on dynamic fracture characteristics of sandstones under blasting |
| LIU Ruifeng1，2，ZHU Zheming1，2，LIU Bang1，2，WAN Duanying1，2，LI Meng1，2 |
| (1. MOE Key Laboratory Deep Underground Science and Engineering，Sichuan University，Chengdu，Sichuan 610065，China；2. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract In order to study the fracture characteristics of sandstones under blasting loads，blast tests were carried out on three kinds of sandstone specimens. By X-ray diffraction analysis and scanning electron microscope，the composition of the sandstones and the microstructure of the propagation fracture surface of pre-cracks were studied respectively. A numerical calculation model was established by ABAQUS code and the parameters of mode I crack such as the crack propagation speed and the dynamic fracture toughness were obtained by using experimental-numerical method. The test results show that the main failure mode of the sandstone around the borehole is plastic failure，that the main failure mode of the crack propagation section is brittle fracture and that the different compositions of the three sandstones result in different failure modes of microcrystal，different crack propagation speeds and different fracture toughnesses. The propagation speed of the dynamic crack is not a constant，and the propagation speed and the dynamic initiation toughness of the black sandstone are higher than those of the red and green sandstones. It is also shown that the dynamic propagation toughness is inversely proportional to the propagation speed.
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2019, Vol. 38 
