Computational Modeling of Underground Tunnels in Intact and Jointed Rock.

Abstract

Computational models were developed to predict the dynamic response and damage to reinforced tunnels in rock subjected to ground shock from nuclear weapons. This effort is part of the Underground Technology Program. The finite element calculations were performed with the DYNA3D code using a comprehensive smooth-cap model for intact rock and a nonlinear slideline model for rock joints. Calculated tunnel closures, and free-field stress and velocity histories, compare well with spherical wave tests (SWAT) on aluminum lined tunnels in intact limestone. The intact rock model includes a scalar anisotropic damage formulation for modeling strain-softening and modulus reduction, viscoplastic formulations and rate-shifted damage surfaces for modeling rate effects, and a three-invariant plasticity formulation. Preliminary "stack of bricks" calculations were also performed to verify our joint model, in preparation for future predictions of tunnel response in jointed limestone.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1997
Accession Number
ADA319834

Entities

People

  • Yvonne D. Murray

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Bulk Modulus
  • Civil Engineering
  • Computational Modeling
  • Elements
  • Engineering
  • Finite Element Analysis
  • Free Field
  • High Pressure
  • Laboratory Tests
  • Mechanical Properties
  • Mechanics
  • Plastic Properties
  • Softening
  • Stress Strain Relations
  • Stresses
  • Three Dimensional
  • Waves

Readers

  • Computational Fluid Dynamics (CFD)
  • Explosive Engineering.
  • Mechanical Engineering/Mechanics of Materials.