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Damage-viscoplastic model based on the Hoek-Brown criterion for numerical modeling of rock fracture

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Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut99-114
Sivumäärä16
JulkaisuRakenteiden mekaniikka
Vuosikerta48
Numero2
TilaJulkaistu - 2015
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

This article presents a phenomenological damage-viscoplastic model based on the empirical Hoek-Brown criterion for numerical modeling of rock fracture. The viscoplastic part of the model is formulated in the spirit of the consistency model by Wang (1997). Isotropic damage model with separate damage variables in tension and compression is employed to describe the stiffness and strength degradation. The model is implemented with the FE method using the constant strain triangle elements. The equations of motion are solved with the explicit time
marching scheme. In the numerical examples, after demonstrating the model response at the material point level, confined compression and uniaxial tension tests on rock are simulated as quasi-static problems. Moreover, the dynamic three-point bending of a notched semicircular disc test is simulated in order to demonstrate the model predictions under dynamic loading conditions.

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