TUNNEL HARDENING THROUGH INNOVATIVE ROCK BOLTS AND SHOTCRETE LINERS

Award Information
Agency:
Department of Defense
Branch
Defense Threat Reduction Agency
Amount:
$176,701.00
Award Year:
1989
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
6607
Agency Tracking Number:
6607
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
8220 Russell Rd, Alexandria, VA, 22309
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Eugene L Foster
(703) 360-3200
Business Contact:
() -
Research Institute:
n/a
Abstract
DEEP BASING FACILITIES REQUIRE THAT STRUCTURES BE PROTECTED AGAINST BLAST EFFECTS. INHERENT IN THIS NEED IS FOR THE TUNNEL SUPPORT SYSTEM TO BE ECONOMICALLY INSTALLED AND CAPABLE OF WITHSTANDING OVERSTRESSES WHICH MAY REACH OR EXCEED 1 KILOBAR. IN ORDER TO MORE EFFICIENTLY HARDEN A STRUCTURE, THE SUPPORT SYSTEM SHOULD BE MADE MORE DUCTILE SO THAT IT CAN UNDERGO DEFORMATION WHILE RETAINING ITS ABILITY TO RESIST LOADING. ONCE CONCEPT FOR DEVELOPING THIS DUCTILITY IS THE USE OF INNOVATIVE ROCK BOLTS AND SHOTCRETE LINERS. PATTERENED ROCK BOLTS AND SHOTCRETE ARE GENERALLY MORE ECONOMICAL THAN MONOLITHIC CONRETE WITH FRANGIBLE BACKPACKING, HOWEVER, TESTING HAS LIMITED THEIR EFFECTIVENESS TO THE 1/4 KBAR RANGE. THEREFORE, THE NEED EXISTS TO DEVELOP A ROCK BOLT - SHOTCRETE LINING SYSTEM WHICH PROVIDES GREATER LEVELS OF HARDNESS BUT REMAINS MORE ECONOMICAL THAN THE CAST-IN-PLACE CONCRETE LINERS. THIS ANALYSIS WILL DEVELOP THIS SYSTEM.

* information listed above is at the time of submission.

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