Effect of Shock Loading on Rock Properties and in situ States.
Abstract
In situ characteristics of geological materials are a function of the mineral and chemical composition, physical properties such as porosity and moisture content, and in situ stress state. The material characteristics or behavior can be altered by changes in the above mentioned parameters or by changing the stress history of the material. Very little is known, however, about the latter and especially shock wave induced stress changes. The Nevada Test Site nuclear test program presented an opportunity to study the changes in ash-full tuff material resulting from shock waves ranging in magnitude from approximately 100 MPa to 1000 MPa. Comparisons are made of the geology, physical and mechanical properties, geophysical properties, and geomechanical properties of the tuff media, before and after a nuclear event. The results indicate changes in the physical and mechanical properties (i.e. stress-volume response, shear strengths, ultrasonic velocities), geophysical properties (seismic velocities) and geomechanical properties (in situ stresses). Little change was noticeable in the geology except for some indication of horizontal movement in small, tight discontinuous fractures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1980
- Accession Number
- ADA096722
Entities
People
- J. W. Lacomb
- S. W. Butters