The effect of pre-existing microcavities on mechanical rock performance in sedimentary and crystalline rocks

Howarth D.F. (1987) The effect of pre-existing microcavities on mechanical rock performance in sedimentary and crystalline rocks. International Journal of Rock Mechanics and Mining Sciences and, 24 4: 223-233. doi:10.1016/0148-9062(87)90177-X


Author Howarth D.F.
Title The effect of pre-existing microcavities on mechanical rock performance in sedimentary and crystalline rocks
Journal name International Journal of Rock Mechanics and Mining Sciences and
ISSN 0148-9062
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1016/0148-9062(87)90177-X
Volume 24
Issue 4
Start page 223
End page 233
Total pages 11
Subject 1905 Visual Arts and Crafts
1900 Earth and Planetary Sciences
2300 Environmental Science
2200 Engineering
Abstract Diamond and percussion drill performances, and mechanical rock properties in 11 sedimentary and crystalline rock types are reported. Pre-existing or natural microcavities in sandstones (high porosity materials) and crystalline rocks (low porosity materials) each have a significant and different effect on drilling rates and strength properties in their respective rock types. A gradual change in sedimentary porosity produces a similar gradual change in drilling rates and strength properties. A small change in crystalline rock porosity produces a profound change in strength properties and a lesser effect on drill penetration rates. Brazilian disc fracture modes in the sandstones were predominantly inter-granular and through the phyllosilicate matrix. Crystalline rocks exhibited three fracture modes: inter-granular along grain boundaries, intra-granular along cleavage direction and intra-granular chonchoidal fractures. The mechanical performance of sandstones can be directly related to porosity. The mechanical performance of crystalline rocks cannot be directly related to porosity as measured in this paper. It is assumed other mechanisms control fracture processes in these rock types.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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