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dc.contributor.author
Vidanage De Silva, Radhika
dc.contributor.author
Konietzky, Heinz
dc.contributor.author
Märten, Horst
dc.contributor.author
Ranjith, Pathegama Gamage
dc.contributor.author
Lei, Zhengda
dc.contributor.author
Xu, Tao
dc.date.accessioned
2024-02-05T11:20:27Z
dc.date.available
2024-01-30T08:58:56Z
dc.date.available
2024-02-05T11:20:27Z
dc.date.issued
2023-03
dc.identifier.issn
0266-352X
dc.identifier.issn
1873-7633
dc.identifier.other
10.1016/j.compgeo.2022.105187
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/656419
dc.description.abstract
Soundless Cracking Demolition Agents (SCDAs) are becoming increasingly popular for near-surface underground rock fragmentation applications. Several studies have been carried out to accurately simulate the fracturing processes of SCDA under its volumetric expansion inside a borehole. These numerical simulations and experiments have been limited mainly to homogeneous and intact rock masses in most cases. In this paper, we present a numerical approach that assesses the influence of mineral heterogeneity and rock mass defects (pore structures) on the fracturing performance of SCDA at the grain size level. For the simulation, a numerical crystalline rock grain assembly was generated using NEPER (a polycrystal generation tool) to introduce spatial variability of grain size that closely mimicked the grain arrangement of granitic rock. The assembly was then imported to 3- Dimensional Distinct Element Code (3DEC) as a block-based model. Heterogeneity was introduced to the model in terms of both mineralogical spatial distribution and strength variation. Pore spaces were introduced to the model using random grain deletion in the rock model. Intergranular and transgranular fracturing of the assembly was also simulated by utilizing a dual-layer discretization technique in 3DEC. SCDA charged fracture simulation was carried out in the model using a single central injection well. The results suggest intergranular fracturing to be the dominant mode of fracturing with additional grain crushing (transgranular fracturing) in the vicinity of the injection well. Grain size and in-situ stress anisotropy largely affect the direction and geometry of radial fractures initiated around an injection well during SCDA charging. The stress concentrations introduced by the pore structures of the matrix were found to have a strong influence on crack deflection, additional microcracking in the matrix and final tortuosity of the fractures produced. The results presented in this paper suggest that the micro-mechanical heterogeneity of the rock mass significantly influences the final fracture pattern produced by SCDA charging and therefore should be given more attention during crystalline rock preconditioning applications.
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.subject
Soundless cracking demolition agents
en_US
dc.subject
Block-based modelling
en_US
dc.subject
Discrete element method
en_US
dc.subject
Intergranular fracturing
en_US
dc.subject
Transgranular fracturing
en_US
dc.subject
Brittle rock failure
en_US
dc.title
Grain-scale numerical simulation of crystalline rock fracturing using Soundless Cracking Demolition Agents for in-situ preconditioning
en_US
dc.type
Journal Article
dc.date.published
2022-12-21
ethz.journal.title
Computers and Geotechnics
ethz.journal.volume
155
en_US
ethz.journal.abbreviated
Comput. Geotech.
ethz.pages.start
105187
en_US
ethz.size
16 p.
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02704 - Geologisches Institut / Geological Institute::09797 - Aaron, Jordan / Aaron, Jordan
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02704 - Geologisches Institut / Geological Institute::09797 - Aaron, Jordan / Aaron, Jordan
en_US
ethz.date.deposited
2024-01-30T08:58:56Z
ethz.source
FORM
ethz.eth
no
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2024-02-05T11:20:28Z
ethz.rosetta.lastUpdated
2024-02-05T11:20:28Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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