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Evaluation and durability testing of a staged combustion rock ripper - 2 volume set. Phase 2 - evaluation of the application of repetitive fuel/air explosions to rock ripping.

Authors
Colburn-JW
Source
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, H0252056, 1977 Apr; :1-96
Link
NIOSHTIC No.
10001501
Abstract
A tractor-integrated version of an explosive ripping system was developed for mining application. This system uses diesel fuel and a tractor-mounted blower supplying 30 psig compressed air to a two- stage combustion chamber to produce a high-pressure (600 psia) gas charge. The charge is rapidly released into the rock formation near the tip of the ripper. The system, mounted on a d9 tractor, was tested at several quarry and mining operations to investigate rock fracturing effectiveness. Although the results of comparative ripping passes conclusively demonstrated that the system increases rock fracture, performance of the system is strongly dependent on rock morphology and properties as well as basic performance of the tractor-ripper. The theory of conventional and explosive ripping modes is described, and existing correlations of seismic velocity and ripper performance are shown to be in error.
Publication Date
19770401
Document Type
CP; Final Contract Report
Fiscal Year
1977
NTIS Accession No.
PB-278267
NTIS Price
A06
Identifying No.
OFR 15(2)-78; Contract-H0252056
NIOSH Division
SRC
Source Name
Evaluation and durability testing of a staged combustion rock ripper - 2 volume set. Phase 2 - evaluation of the application of repetitive fuel/air explosions to rock ripping
State
WA; TX
Performing Organization
Southwest Research Institute
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