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FDEM simulation of rock damage evolution induced by contour blasting in the bench of tunnel at deep depth

Citation

Han, H and Fukuda, D and Liu, H and Fathi Salmi, E and Sellers, E and Liu, TJ and Chan, A, FDEM simulation of rock damage evolution induced by contour blasting in the bench of tunnel at deep depth, Tunnelling and Underground Space Technology, 103 Article 103495. ISSN 0886-7798 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Elsevier Ltd.

DOI: doi:10.1016/j.tust.2020.103495

Abstract

One highly effective approach for tunnelling in rock at deep depth is blasting. The damage and in-situ stress redistribution in the surrounding rock mass induced by the blast loading during this process is, however, unavoidable. In this study, a powerful GPGPU-parallelized combined finite-discrete element method is implemented to study the damage evolution during controlled contour blasting in the bench of a deep-buried tunnel. The proposed method is characterized by the simulation of the blasting-induced pressure variation via the pressure-gas volume history curve and the modelling of the transition from continuum to discontinuum behaviour in the surrounding rock mass. The in-situ stress distribution, the blasting-induced stress wave propagation, and the corresponding rock fracture and fragmentation process are modelled and analysed. The numerical simulation results indicate that the in-situ stresses play a key role in the damage evolution around the tunnel, strongly influencing the stress redistribution pattern and thus the fracture initiation and propagation around the tunnel during blasting. Several different in-situ stress regimes are considered and discussed, revealing the dominating effects of the major principal stress and lateral pressure coefficient on the rock damage behaviour. Moreover, the blasting results obtained from employing the pressure–time history curve with varying decay time ratios and decoupling ratios are also studied. Longer decay time ratios and higher decoupling ratios induce additional rock fracture and fragmentation, indicating that the model can enable the selection of stemming and explosive type for effective breakage with limited damage around a tunnel.

Item Details

Item Type:Refereed Article
Keywords:FDEM, dynamic fracture process, rock blasting, stress wave propagation, rock fracture and fragmentation
Research Division:Engineering
Research Group:Civil engineering
Research Field:Civil geotechnical engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Han, H (Mr Haoyu Han)
UTAS Author:Fukuda, D (Dr Daisuke Fukuda)
UTAS Author:Liu, H (Dr Hong Liu)
UTAS Author:Fathi Salmi, E (Dr Ebrahim Fathisalmi)
UTAS Author:Sellers, E (Dr Ewan Sellers)
UTAS Author:Liu, TJ (Associate Professor Tingjin Liu)
UTAS Author:Chan, A (Professor Andrew Chan)
ID Code:139957
Year Published:2020
Web of Science® Times Cited:4
Deposited By:Engineering
Deposited On:2020-07-20
Last Modified:2021-02-03
Downloads:0

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