MULTISURFACE CHEMOPLASTICITY. I: MATERIAL MODEL FOR SHOTCRETE

Employing a thermodynamic framework, chemomechanical couplings for shotcrete are treated in this paper. A new material model based on multisurface chemoplasticity is presented. It accounts for hydration kinetics and chemomechanical couplings related to the strength growth and the evolution of stiffness properties as well as for autogeneous shrinkage in early-age shotcrete. The underlying intrinsic material functions, which are independent of field and boundary conditions, are determined from standard material tests. As for the numerical treatment of the constitutive equations of the material model, an extended form of the return mapping algorithm is proposed. The constitutive equations are applied to a two-surface chemoplastic model, consisting of a Drucker-Prager loading surface and a tension cutoff. In a companion paper, the proposed material model is employed for two-dimensional structural analyses of tunnels driven according to the New Austrian Tunneling Method.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00765107
  • Record Type: Publication
  • Contract Numbers: CMS-9733769, DE-AC02-76CH00016, MAT97-0564
  • Files: TRIS
  • Created Date: Jun 25 1999 12:00AM