Modelling Rock Blasting Considering Explosion Gas Penetration Using Discontinuous Deformation Analysis |
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| Authors: | Youjun Ning Jun Yang Guowei Ma Pengwan Chen |
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| Institution: | (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 Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia |
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| Abstract: | Explosion gas plays an important role in rock mass fragmentation and cast in rock blasting. In this technical note, the discontinuous deformation analysis method is extended for bench rock blasting by coupling the rock mass failure process and the penetration effect of the explosion gas based on a generalized artificial joint concept to model rock mass fracturing. By tracking the blast chamber evolution dynamically, instant explosion gas pressure is derived from the blast chamber volume using a simple polytropic gas pressure equation of state and loaded on the blast chamber wall. A bench blasting example is carried out. The blast chamber volume and pressure time histories are obtained. The rock failure and movement process in bench rock blasting is reproduced and analysed. |
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