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