A new 3D constitutive model for rock mass tunnel

Q. Zhang, H. H. Zhu, Lianyang Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Pages2484-2489
Number of pages6
Volume4
ISBN (Print)9781510810518
StatePublished - 2015
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: Jun 29 2015Jul 1 2015

Other

Other49th US Rock Mechanics / Geomechanics Symposium
CountryUnited States
CitySan Francisco
Period6/29/157/1/15

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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  • Cite this

    Zhang, Q., Zhu, H. H., & Zhang, L. (2015). A new 3D constitutive model for rock mass tunnel. In 49th US Rock Mechanics / Geomechanics Symposium 2015 (Vol. 4, pp. 2484-2489). American Rock Mechanics Association (ARMA).