Accession Number : ADA018334

Title :   Geophysical Methods in Terrestrial Material Property Determinations.

Descriptive Note : Air Force Surveys in geophysics,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS

Personal Author(s) : Bliamptis,Emmanuel E. ; Thomson,Ker C.

Report Date : 23 JUL 1975

Pagination or Media Count : 37

Abstract : In-house and contractual research was conducted on the relationships between mechanical (strength) properties of rock and soil material and their electrical properties. A theoretical study involved the quantum electromagnetic and elastic interactions of crystals and solids. Laboratory and field investigations were made of the porosity and surface crack networks of large masses of quarry rocks, which govern their conductivity and permittivity. Thermal and mechanical stressing of rocks were analyzed. Electrical parameters of deep mine rocks were measured in-situ with emphasis on frequency/conductivity relationships. Direct mapping of rock strength as a function of electrical resistivity was investigated in the field. A three-dimensional modeling program was conducted in the laboratory. Field measurements of dynamic electrical conductivity of various earth materials were made under conditions of a rapid stress generated by high explosive setonations. Correlations demonstrated by this geophysical and geological research can be useful in prediction or evaluation of nuclear weapon shock effects on military installations.

Descriptors :   *Rock mechanics, *Soil surveys, Electrical properties, Nuclear explosion damage, Test methods, Elastic properties, Porosity, Shock waves, Mapping, Underground explosions, Field tests, Laboratory Tests, Mathematical analysis, Underground, Electrical conductivity, Geology

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE