Wave Propagation in Porous Geologic Composites
Abstract
Predictive models for calculating stress wave effects in a geologic medium are developed from the viewpoint that the medium is a composite consisting of the rock matrix and pores that may be only partially filled with water. A representative Nevada Test Site tuff (NTS tuff) is selected in order tor the geologic composite from the equations of state previously developed for its constituents, water and poreless NTS tuff, in an earlier phase of this work. The Theory of Interacting Continua (TINC) framework is used to discuss Hugoniot relations for a composite and previously published models are found to be special cases corresponding to hypotheses on the energy partition and interactive forces between the constituents. A physically realistic equation of state (P'EQ) for completely crushed porous wet tuff is developed which accounts for the material's substructure. The model is based on computer simulation studies of composite configurations. Shock and release states predicted by the P'EQ model are compared with those predicted by an equation of state in which the water and tuff components are considered to be individually shocked to the mutual equilibrium pressure (PEQ) and a composite equation of state based on the assumption of pressure and thermal equilibrium (PTEQ).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1971
- Accession Number
- AD0732023
Entities
People
- C. R. Hastings
- J. W. Kirsch
- K. G. Hamilton
- S. K. Garg
- T. David Roney
Organizations
- Utility Systems Science and Software (United States)