CONTROLLED FRACTURE TECHNIQUES FOR CONTINUOUS D DRILL AND BLAST

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 754
Amount: $358,000.00
Phase: Phase II
Program: SBIR
Awards Year: 1986
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
P.o. Box 1173, Steamboat Springs, CO, 80477
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Chapman Young
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE COMMERCIAL APPLICATION OF SMALL CHARGE, CONTINUOUS DRILLAND BLAST AND SYSTEMS HAS NOT BEEN REALIZED PRIMARILY BECAUSE OF THE HAZARDS AND OPERATIONAL PROBLEMS DERIVING FROM THE (ALBEIT SMALLER) EXPLOSIVE CHARGES EMPLOYED. CONSIDERABLE RECENT WORK ON ROCK FRAGMENTATION BY CONTROLLEDFRACTURE BLASTING CONDUCTED AT THE UNIVERSITY OF MARYLAND AND ELSEWHERE HAS REVEALED THAT WITH AN APPROPRIATE SHOTHOLEGEOMETRY AND PLACEMENT OF CHARGES THEREIN, THE QUANTITY OF EXPLOSIVE REQUIRED TO FRACTURE AND FRAGMENT ROCK CAN BE SIGNIFICANTLY REDUCED. IT HAS BEEN SHOWN THAT PRESPLITTING CAN INCREASE THE FRAGMENTATION REALIZED WITH SMALLER CHARGES. OTHER WORK ON DYNAMIC BUT NON-EXPLOSIVE ROCK EXCAVATION TECHNIQUES HAS SHOWN THAT VERY EFFICIENT ROCK BREAKAGE CAN BE REALIZED WITH RAPIDLY PRESSURIZED SHALLOW BOREHOLES. IT IS PROPOSED TO CONDUCT NUMEROUS SINGLE AND MULTI HOLE EXPLOSIVE TESTS IN BOTH PHOTOELASTIC MATERIAL AND ROCK SO AS TO ESTABLISH THE TECHNIQUES AND POTENTIAL FOR APPLYING CONTROLLED FRACTURE BLASTING TECHNIQUES TO SAMLL CHARGE CONTINUOUS DRILL AND BLAST SYSTEMS. THESE TESTS WILL INCLUDE INSTRUMENTATION AND MEASUREMENTS TO STUDY THE PHENOMENA (SUCH AS FRACTURE PRESSURIZATION) CONTROLLING THE ROCK FRAGMENTATION.

* Information listed above is at the time of submission. *

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