Accession Number : AD0715264
Title : Flat Jack Tests.
Descriptive Note : Technical rept. Apr-Dec 69 on Phase I,
Corporate Author : AEROSPACE CORP SAN BERNARDINO CALIF SAN BERNARDINO OPERATIONS
Personal Author(s) : Pfefferle,Warren ; Smith,Craig R.
Report Date : 06 OCT 1970
Pagination or Media Count : 50
Abstract : Tests were conducted utilizing large flat jack devices placed in a vertical slot for high pressure loading of rock to measure in-situ properties of a rock mass. The high pressure flat jack devices were used as a site investigation tool to obtain rock mass properties. Tests were conducted before and after a 100 ton surface high explosive detonation test to assess explosive effects on the rock. It was conslusively demonstrated by these tests that meaningful flat jack tests could be successfully accomplished; also, a significantly different response of the rock medium was measured as larger areas of rock were loaded. Surface jointing was severely disturbed by the explosion. (Author)
Descriptors : (*ROCK, MECHANICAL PROPERTIES), (*NUCLEAR EXPLOSIONS, EXPLOSION EFFECTS), LOADS(FORCES), JOINTS, CRACKS, JACKS(LIFTS), DETONATIONS, SHEAR STRESSES
Subject Categories : Geology, Geochemistry and Mineralogy
Distribution Statement : APPROVED FOR PUBLIC RELEASE