Fragmentation Processes in Soft Rock.
Abstract
An experimental investigation has been undertaken to study the fragmentation of soft and hard rock under conditions of impact by spherical steel projectiles and standard ammunition. Laboratory tests involving the firing of a 1/4-inch-diameter steel sphere have been conducted both on the Berkeley campus and at the Naval Weapons Center, China Lake. The velocity range at the first site was from 500 to 750 ft/sec., using a pneumatic propulsion device, whereas that at the second location varied from 1100 to 8500 ft/sec., by means of a powder gun. Both shale and diorite targets with a diameter of 5-1/2 in. and thickness ranging from 1 in. to more than 5 in. were employed in these tests. In addition, 19 rounds of 20 and 40 mm ammunition were fired at velocities from 2000 to 2900 ft/sec. into shale cliffs located in the open pit mine of the U.S. Borax and Chemical Corporation, Boron, California.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 10, 1975
- Accession Number
- ADA008232
Entities
People
- Werner Goldsmith
Organizations
- University of California, Berkeley