Formation of radial cracks in rock blasting analyzed in terms of the modified Griffith's theory
Griffith's theory of brittle fracture, as modified by McClintock and Walsh to fit rock behavior in cases of failure by compression, has been successfully applied in various fields of rock mechanics. Extension of the Griffith's criterion to rock blasting problems may also be more representative of rock behavior than the simple consideration of a criterion of failure based on the dynamic tensile strength of the material. If consideration is given to pre-existing cracks within rock structure, occurring not only because of the discontinuous properties of rocks, but also as a result of drilling operations that normally precede blasting, those cracks can be propagated under the action of the dynamic stresses (radial and tangential) induced by the passage of the wave emitted by the explosion. (16 refs.)
- Research Organization:
- Minnesota Univ.
- OSTI ID:
- 5385909
- Journal Information:
- Proc. 12th Annual Rock. Mech. Symp.; (United States), Journal Name: Proc. 12th Annual Rock. Mech. Symp.; (United States)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300 -- Petroleum-- Drilling & Production
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BRITTLENESS
COMMINUTION
CRACK PROPAGATION
CRACKS
EXPLOSIVE FRACTURING
EXPLOSIVE STIMULATION
FRACTURING
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
ROCK MECHANICS
ROCKS
STIMULATION
STRESS ANALYSIS
STRESSES
TENSILE PROPERTIES
TESTING
WAVE PROPAGATION
WELL COMPLETION
WELL STIMULATION