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| Numerical Analysis of the slotted cartridge blasting crack extension by temporal-spatial evolution |
| Received:December 25, 2017 Revised:January 08, 2018 |
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| DOI： |
| KeyWord:slotted cartridge；temporal and spatial evolution；joint modeling；transfixion crack；numerical simulation |
| Author | Institution |
| Hu Jianhua |
中南大学资源与安全工程学院 |
| Deng Yulin |
中南大学资源与安全工程学院 |
| Wang Chang |
中南大学资源与安全工程学院 |
| Yang Chun |
中南大学资源与安全工程学院 |
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| Abstract: |
| Based on the complexity and uncertainty of smooth blasting, it is difficult to observe the blasting crack by the crack initiation, extension and transfixion through the field test. The model of smooth blasting that air as coupling medium is established by combining CAD with ANSYS. The explicit dynamic software LS-DYNA is used to simulate slotted cartridge blasting crack extension with elements failure is defined, to provide more accurate guidance for mine laneway blasting projects from the aspects of temporal and spatial evolution with multi-direction cutaway views. The research results as follows: 1) Joint modeling with CAD and ANSYS can fill the gap of ANSYS for complex model modeling, and achieve refined digital modeling for roadway; 2) Blasting crack extension is more intuitive with elements failure is defined, and which has contributed to the analysis of cutting effect. The blast-induced crack surrounding the hole and crack bifurcation phenomenon are reduced significantly, when slotted cartridge blasting is compared with the model of smooth blasting that air as coupling medium; 3) Through the temporal and spatial evolution simulation of slotted cartridge when decoupling coefficient was 1.5、1.8、2.25, found that the number of slotted cartridge blasting crack reduce with the increase of decoupling coefficient, crack extension length becomes shorter, the bifurcation of crack extension decreased significantly; When decoupling coefficient is 1.8, the numerical simulation of slotted cartridge blasting crack extension form better transfixion crack evolution, obtain good blasting effect. |
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