TY - GEN
T1 - A new 3D constitutive model for rock mass tunnel
AU - Zhang, Q.
AU - Zhu, H. H.
AU - Zhang, L. Y.
N1 - Funding Information:
Key Program of Natural Science Foundation of China (Grant No. 41130751), 'Thousand Talents Program' of Shanghai, Open Research Foundation of Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education (KLE-TJGE-B1405), and the General Program of Natural Science Foundation of China (Grant No. 41272289) for support of this research.
Publisher Copyright:
Copyright 2015 ARMA, American Rock Mechanics Association.
PY - 2015
Y1 - 2015
N2 - A new constitutive model is proposed based on the generalized three-dimensional (3D) Hoek-Brown strength criterion, which was proposed by Zhang and Zhu [1, 2]. The constitutive model involves a 3D multi-segment plasticity flow rule that can not only consider the effect of the different confining stresses on the plasticity flow rule and volumetric deformation but also need no addition uncertain parameter such as dilatancy angle. The constant volume flow rule is applied at the high confining stress condition. With the specific mathematical treatment and derivation, a new interpolation and radial flow rule is prescribed at the low confining stress and the tension condition respectively, and the continuity of plastic potential function at the principal stress space is ensured. Then the new constitutive model is implemented in the three-dimensional finite element software (GeoFBA3D). A set of numerical true triaxial compressive tests are carried out and compared with analytical solutions. Finally, a real engineering example of a highway tunnel excavated in rock masses is given for validation and application.
AB - A new constitutive model is proposed based on the generalized three-dimensional (3D) Hoek-Brown strength criterion, which was proposed by Zhang and Zhu [1, 2]. The constitutive model involves a 3D multi-segment plasticity flow rule that can not only consider the effect of the different confining stresses on the plasticity flow rule and volumetric deformation but also need no addition uncertain parameter such as dilatancy angle. The constant volume flow rule is applied at the high confining stress condition. With the specific mathematical treatment and derivation, a new interpolation and radial flow rule is prescribed at the low confining stress and the tension condition respectively, and the continuity of plastic potential function at the principal stress space is ensured. Then the new constitutive model is implemented in the three-dimensional finite element software (GeoFBA3D). A set of numerical true triaxial compressive tests are carried out and compared with analytical solutions. Finally, a real engineering example of a highway tunnel excavated in rock masses is given for validation and application.
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M3 - Conference contribution
AN - SCOPUS:84964886156
T3 - 49th US Rock Mechanics / Geomechanics Symposium 2015
SP - 2484
EP - 2489
BT - 49th US Rock Mechanics / Geomechanics Symposium 2015
PB - American Rock Mechanics Association (ARMA)
T2 - 49th US Rock Mechanics / Geomechanics Symposium
Y2 - 29 June 2015 through 1 July 2015
ER -