LABORATORY STUDY OF EXTENSION FAILURE IN NEVADA TEST SITE TUFFS

Award Information
Agency: Department of Defense
Branch: Defense Threat Reduction Agency
Contract: N/A
Agency Tracking Number: 11533
Amount: $60,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Terra Tek Inc
400 Wakara Way, Salt Lake City, UT, 84108
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Gary Torres
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
CALCULATED GROUND MOTION FROM NUCLEAR EXPLOSIONS PREDICT THAT AT LOCATIONS NEAR THE CAVITY THE ROCK FAILURE SURFACE WILL BE ENCOUNTERED IN EXTENSION DURING LATER STAGES OF UNLOAD. THE RESULTING HOOP FRACTURES WILL PRODUCE A FAILED ROCK ZONE SURROUNDING THE CAVITY. HIGH PRESSURE CAVITY GASES COULD INITIATE A HYDRAULIC FRACTURE THROUGH THE FRACTURE ROCK WHICH, UNDER THE WORST CONDITION, WOULD LEAD TO VENTING. THE PURPOSE OF THE PROPOSED WORK IS TO EVALUATE EXTENSION STRENGTHS OF NEVADA TEST SITE TUFFS. ALTHOUGH SOME EXTENSION TESTS HAVE BEEN MADE, EXPERIMENTAL UNCERTAINTY EXISTS DUE TO LOCAL (SURFACE) FLAWS CAUSING PREMATURE SAMPLE FAILURE. IN PHASE I OF THE PROPOSED CONTRACT, TEST EQUIPMENT MODIFICATIONS NEEDED TO PERFORM THETESTS AND TEST SAMPLES WILL BE DESIGNED AND FABRICATED. EXTENSION TESTS WILL BE PERFORMED ON TUFFS AT CONFINED PRESSURES FROM ATMOSPHERIC TO 2 KILOBARS. PRELIMINARY TESTSWILL BE PERFORMED TO EXAMINE POTENTIAL EXPERIMENTAL PROBLEMSFOR THE WORK TO BE UNDERTAKEN IN PHASE II WHERE EXTENSION WILL FOLLOW PRELOADING ALONG THE COMPLETE STRAIN-PATH HISTORIES EXPERIENCED BY ROCK NEAR-IN THE CAVITY.

* information listed above is at the time of submission.

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