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The Mohr-Coulomb (MC) criterion possesses a linear shear failure envelope and is widely used in geotechnical engineering calculations. However, the failure process in rockmass is more complex than that of soils, and it can be more adequately described by the Hock-Brown (HB) failure criterion. This criterion has been updated as well as modified, but its effect on the shear failure envelope has not been studied. The shear failure envelope for the modified form of HB criterion is derived in this paper, which shows that a change in the value of parameter a from 0.5 to 0.6 affects the shear envelope more significantly for a rockmass characterized by a larger value of paramoter m and high effective normal stress. The instantaneous friction angle is also affected by a change in the value of parameter a.
The Mohr-Coulomb (MC) criterion possesses a linear shear failure envelope and is widely used in geotechnical engineering calculations. However, the failure process in rockmass is more complex than that of soils, and it can be more adequately described by the Hock-Brown (HB) failure criterion. This criterion has been updated as well as modified, but its effect on the shear failure envelope has not been studied. The shear failure envelope for the modified form of HB criterion is derived in this paper, which shows that a change in the value of parameter a from 0.5 to 0.6 affects the shear envelope more significantly for a rockmass characterized by a larger value of paramoter m and high effective normal stress. The instantaneous friction angle is also affected by a change in the value of parameter a.
Shear failure envelope of Hoek-Brown criterion for rockmass
Kumar, P. (author)
Tunnelling and Underground Space Technology ; 13 ; 453-458
1998
6 Seiten, 16 Quellen
Article (Journal)
English
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