Accession Number : AD0666799

Title :   THE USE OF HIGH MODULUS INCLUSION FOR IN-SITU STRESS DETERMINATION IN VISCO-ELASTIC ROCKS,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS SCHOOL OF MINERAL AND METALLURGICAL ENGINEERING

Personal Author(s) : Peleg,Naamen

Report Date : MAR 1968

Pagination or Media Count : 129

Abstract : Experiments have been conducted to determine the possible use of a high modulus inclusion for the direct determination of stresses in a visco-elastic material. A system was designed to sustain a constant hydrostatic pressure over a long period of time--the main feature of this system is a pressure intensifier activated and regulated by gas pressure. Two sets of tests were conducted with an inclusion inserted in a hole drilled in a salt core subjected to radial hydrostatic pressure. In the first set the inclusion was cemented into the rock and pressures ranging from 1000 to 8000 psi were applied on the specimen. Stress in the inclusion was immediately recorded and no significant time dependent change in stress was observed. The final stress recorded in the inclusion was in the order of 1.45-1.52 of the hydrostatic pressure independent of pressure level. In the second set of tests the inclusion was inserted loosely into the hole. Once contact of the creeping salt and the inclusion was created, time dependent stress change was observed in the inclusion. (Author)

Descriptors :   (*ROCK, STRESSES), VISCOELASTICITY, DEFECTS(MATERIALS), HYDROSTATIC PRESSURE, MODULUS OF ELASTICITY, DEFORMATION, COMPRESSIVE PROPERTIES, STRAIN GAGES, MATHEMATICAL ANALYSIS, ROCK SALT, METAMORPHIC ROCK, THESES, UNDERGROUND STRUCTURES, RESPONSE, MEASUREMENT

Subject Categories : Mining Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE