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Hybrid finite-discrete element modelling of excavation damaged zone formation process induced by blasts in a deep tunnel

Citation

An, H and Liu, H and Han, H, Hybrid finite-discrete element modelling of excavation damaged zone formation process induced by blasts in a deep tunnel, Advances in Civil Engineering, 2020 Article 7153958. ISSN 1687-8086 (2020) [Refereed Article]


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Copyright Statement

Copyright 2020 Huaming An et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1155/2020/7153958

Abstract

A brief literature review of numerical studies on excavation damage zone (EDZ) is conducted to compare the main numerical methods on EDZ studies. A hybrid finite-discrete element method is then proposed to model the EDZ induced by blasts. During the excavation by blasts, the rock mass around the borehole is subjected to dynamic loads, i.e., strong shock waves crushing the adjacent rocks and high-pressure gas expanding cracks. Therefore, the hybrid finite-discrete element method takes into account the transition of the rock from continuum to discontinuum through fracture and fragmentation, the detonation-induced gas expansion and flow through the fractured rock, and the dependence of the rock fracture dynamic behaviour on the loading rates. After that, the hybrid finite-discrete element method is calibrated by modelling the rock failure process in the uniaxial compression strength (UCS) test and Brazilian tensile strength (BTS) test. Finally, the hybrid finite-discrete element method is used to model the excavation process in a deep tunnel. The hybrid finite-discrete element method successfully modelled the stress propagation and the fracture initiation and propagation induced by blasts. The main components of the EDZ are obtained and show good agreements with those well documented in the literature. The influences of the initial gas pressure, in situ stress, and spacing between boreholes are discussed. It is concluded that the hybrid finite-discrete element method is a valuable numerical tool for studying the EDZ induced by blasts in deep tunnels.

Item Details

Item Type:Refereed Article
Keywords:FDEM, EDZ, deep tunnel, rock blast, rock failure
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:Liu, H (Dr Hong Liu)
UTAS Author:Han, H (Mr Haoyu Han)
ID Code:139956
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Engineering
Deposited On:2020-07-20
Last Modified:2021-02-03
Downloads:1 View Download Statistics

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