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Numerical studies on the failure process and associated microseismicity in rock under triaxial compression
Luleå tekniska universitet.
Luleå tekniska universitet.
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: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 384, no 1-4, p. 149-174Article in journal (Refereed) Published
Abstract [en]

In this paper, firstly the mesoscopic elemental mechanical model for elastic damage is developed and implemented into the rock and tool interaction code (R-T (super 2D) ). Then the failure processes of a heterogeneous rock specimen subjected to a wide variety of confining pressures (0-80 MPa) are numerically investigated using the R-T (super 2D) code. According to the simulated results, on the one hand, the numerical simulation reproduced some of the well-known phenomena observed by previous researchers in triaxial tests. Under uniaxial compression, rock failure is caused by a combination of axial splitting and shearing. Dilatancy and a post-failure stage with a descending load bearing capacity are the prominent characteristics of the failure. As the confining pressure increases, the extension of the failed sites is suppressed, but the individual failure sites become dense and link with each other to form a shear fracture plane. Correspondingly, the peak strength, the residual strength and the shear fracture plane angle increase, but the brittleness decreases. When the confining pressure is high enough, the specimen behaves in a plastic manner and a narrow shear fracture plane leads to its failure. The prominent characteristics are volume condensation, ductile cataclastic failure, and a constant load bearing capacity with increasing strain. On the other hand, the numerical simulation revealed some new phenomena. The highest microseismicity events occur in the post-failure stage instead of the maximal stress, and most of the microseismicity energies are released in the failure localization process. As the confining pressure increases, the microseismicity events in the non-linear deformation stage increase dramatically and the ratio between the energies dissipated at the non-linear deformation stage and those dissipated in the whole loading process increases correspondingly. Therefore, it is concluded that the developed mesoscopic elemental mechanical model for elastic damage is able to reproduce accurately the failure characteristics in loading rock specimens under triaxial conditions, and the numerical modelling can furthermore obtain some new clarifications of the rock fracture process.

Place, publisher, year, edition, pages
2004. Vol. 384, no 1-4, p. 149-174
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-11579DOI: 10.1016/j.tecto.2004.03.012ISI: 000222707700007Scopus ID: 2-s2.0-3042637076Local ID: a969c8d0-a804-11dc-9534-000ea68e967bOAI: oai:DiVA.org:ltu-11579DiVA, id: diva2:984529
Note
Validerad; 2004; 20071211 (ysko)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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