THE ROCK FRACTURE HAMMER FOR INDEXING THE IMPACT STRENGTH OF ROCKS IN MECHANICAL EXCAVATION

In this technical note, the features and operational mechanism of a new device for indexing the impact strength of rocks are described. This device, which is christened the Rock Fracture Hammer (RFH) can be used along a proposed excavation traverse to obtain indices of intact rock, resistance to cutting forces of mechanical excavator bits. The RFH loads rock through the impact action of a falling hammer. The imposed load is measured in terms of impact energy. Since cutting bits are usually of the order of a few centimeters in dimension, the RFH measures only the impact strength of intact rock. Such measurements can be incorporated into a rock mass classification system that includes the effects of large discontinuities. (A) This paper was presented at the 34th U.S. Symposium on rock mechanics, 27-30 June 1993, University of Wisconsin-Madison. For the covering abstract see IRRD 863389.

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  • Corporate Authors:

    PERGAMON PRESS LTD

    PERGAMON HOUSE, BAMPFYLDE STREET
    OXFORD,   United Kingdom  EX1 2AH

    PERGAMON PRESS LTD

    PERGAMON HOUSE, BAMPFYLDE STREET
    OXFORD,   United Kingdom  EX1 2AH
  • Authors:
    • Inyang, H I
    • Pitt, J M
  • Publication Date: 1993-12

Language

  • English

Media Info

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Filing Info

  • Accession Number: 00662245
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 28 1994 12:00AM