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Simulation of blast induced crater in jointed
rock mass by discontinuous deformation analysis method |
| Youjun NING1,Xinmei AN1,Jun YANG2,Guowei MA3, |
| 1.School of Civil and
Environmental Engineering, Nanyang Technological University, Singapore
639798, Singapore; 2.State Key Laboratory
of Explosion Science and Technology, Beijing Institute of Technology,
Beijing 100081, China; 3.School of Civil and
Environmental Engineering, Nanyang Technological University, Singapore
639798, Singapore；School of Civil and
Resource Engineering, University of Western Australia, 35 Stirling
Highway, Crawley WA 6009, Australia; |
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Abstract Rock blasting is a dynamic process accompanied with the propagations of shock waves and the dispersion of the explosion gas. This paper adopts the discontinuous deformation analysis (DDA) method to simulate the rock blasting process. A dynamic parameter adjustment and the non-reflecting boundary condition are implemented in the DDA method. The sub-block DDA method to simulate fracture problems is used. The blasting process in jointed rock mass is simulated by application of the explosion gas pressure on the expanding borehole walls and induced connected fracture surfaces around the boreholes. The blast craters with different overburdens are derived. The whole process including the explosion gas dispersion, borehole expansion, rock mass failure and cast, and the formation of the final blasting piles in rock blasting are well reproduced numerically. Parametric study for different overburdens is carried out, and the results are analyzed and discussed.
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| Keywords
blast crater
jointed rock mass
explosion gas pressure
discontinuous deformation analysis (DDA) method
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Issue Date: 05 June 2010
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