DYKE PROPAGATION WITH DISTRIBUTED DAMAGE OF THE HOST ROCK
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dc.contributor.author | Mériaux C. | |
dc.contributor.author | Lyakhovsky V. | |
dc.contributor.author | Agnon A. | |
dc.contributor.author | Lister J.R. | |
dc.date.accessioned | 2021-01-15T04:55:26Z | |
dc.date.available | 2021-01-15T04:55:26Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=31317890 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1999, 165, 2, 177-185 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23099 | |
dc.description.abstract | Observations of off-plane inelastic deformation around dykes motivate consideration of models of fluid-driven crack propagation in a solid which can undergo material degradation, or damage. The application to dyke propagation of a recently proposed damage rheology [Lyakhovsky et al., J. Geophys. Res. 102 (1997) 27635–27649] based on thermodynamical principles and experimental measurements is discussed. The rate of accumulation of damage in this rheology is the product of a material-dependent parameter cd and the square of the strain. For geological values, a dimensionless parameter cdη/ΔP characterizing the ratio of a damage timescale to a flow timescale is very small, where η is the magmatic viscosity and ΔP the driving pressure. As a result, significant rates of damage are confined to a small region near the dyke tip, where the strain is large. Consideration of possible singularities in near-tip solutions, shows that the rate of propagation is governed by the viscous fluid mechanics. To a good approximation, the rate has a value equal to that given by the zero-stress-intensity solutions of previous models based on linear elastic fracture mechanics. Predictions from the damage rheology both of a narrow damage zone and of the rate of propagation are in good agreement with observations. | |
dc.title | DYKE PROPAGATION WITH DISTRIBUTED DAMAGE OF THE HOST ROCK | |
dc.type | Статья |
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