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Rock fragmentation mechanisms induced by a drill bit
Luleå University of Technology.
Luleå University of Technology.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Center for Rock Instability & Seismicity Research, Northeastern University, Shenyang.
2004 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 41, no Suppl. 1, p. 527-532Article in journal (Refereed) Published
Abstract [en]

In most of the mechanical excavation methods the fundamental process is indentation of the rock by a bit. The present paper focuses on discussing how the rock is fragmented under the action of a drill bit. The discussions are mainly based on numerical modelling using the rock and tool interaction code (R-T2D) and taking rock heterogeneity into consideration. The simulated results concerning rock penetrations with one, two and multiple indenters are, however, compared with experiments available from the literature. The emphasis is put on discussion of the formation of side-cracks and crushed zones that constitute the major rock removal fractures. The agreement between numerical simulation and experimental observations are reasonably good. This reveals the mechanisms of crack initiation, propagation and coalescence induced by the action of button bits to form the rock fragmentation in a drilling process. The investigation can contribute not only to improving percussive drilling but also to understanding other rock fragmentation and comminution methods and equipment since indentation is also the fundamental process for them.

Place, publisher, year, edition, pages
2004. Vol. 41, no Suppl. 1, p. 527-532
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-10502DOI: 10.1016/j.ijrmms.2004.03.094Scopus ID: 2-s2.0-3042734248Local ID: 950b34b0-bc40-11db-a46c-000ea68e967bOAI: oai:DiVA.org:ltu-10502DiVA, id: diva2:983447
Note
Validerad; 2004; Bibliografisk uppgift: Paper presented at the ISRM SINOROCK 2004 Symposium.; 20070214 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lindqvist, Per-Arne

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