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| Study on dynamic propagation law of cracks with different lengths under blasting |
| LIU Ruifeng1，ZHU Zheming2，DU Yumei1，LI Meng3，LIU Bang4，WAN Duanying2 |
| (1. School of Civil and Architectural Engineering，Panzhihua University，Panzhihua，Sichuan 617000，China；2. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China；3. School of Mining and
Geomatics Engineering，Hebei University of Engineering，Handan，Hebei 056000，China；4. Sino American
School of Applied Technology，Yibin University，Yibin，Sichuan 644000，China) |
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Abstract In order to study the dynamic propagation law of cracks with different lengths in sandstone materials under blasting loads，the crack initiation law and crack propagation speed of sandstone are studied with the help of crack propagation gauge. The dynamic parameters of sandstone and crack propagation time measured in the test are imported into ABAQUS code，a finite element software，to establish a numerical calculation model. The crack propagation speed and dynamic stress intensity factor of mode I cracks and fracture toughness of sandstone with different crack lengths are obtained by experiment-numerical method. The test results show that：(1) In the blasting tests，the initiation time and delayed fracture time of pre-cracks with different lengths are different. When the lengths of pre-cracks vary between 60 and 80 mm，the change of initiation time and delayed fracture time is not obvious，and it basically increases linearly when the lengths vary between 80 and 120 mm，and then the change tends to be flat；(2) The dynamic propagation speed of crack in sandstone is not a not a constant value and fluctuates during crack propagation，when the lengths of pre-cracks vary between 60 and 140 mm，the pre-crack length has little effect on the average propagation speed of dynamic crack，and the variation range is within 10%；(3) With the increase of pre-crack length，the initiation toughness of sandstone increases gradually，that is，the difficulty of sandstone initiation increases，and its propagation toughness is inversely proportional to the propagation speed，which is still valid when the crack length changes.
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2022, Vol. 41 
