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New Techniques for Rock Fracture Energy Measurements.

Authors
Krech-WW; Chamberlain-PG
Source
47th Ann Fall Mtg Soc Petrol Eng AIME San Antonio Texas, 10/8-11/72 SPE Preprint 4060 :6 pages
Link
NIOSHTIC No.
10010570
Abstract
The use of closed-loop, servo-controlled test systems to obtain rock fracture energy measurements in uniaxial tension, torsion, and direct shear is described. Results of fracture energy tests performed on three rock types are presented. Analysis of the test results substantiates the usefulness of measuring fracture energy by the new test techniques. The advantage of these new tests, providing data potentially useful for input into analytical rock response calculations, far outweighs the advantage of the usual test methods--simplicity of test procedure. Fracture energy values for three rock types tested under a series of load configurations indicate that fracture energy requirements increase with confining stress level. The ratio of fracture energy required in uniaxial compression to that in uniaxial tension ranges from 140 for Berea sandstone to 560 for Barre granite.
Publication Date
19720101
Document Type
OP;
Fiscal Year
1972
NTIS Accession No.
NTIS Price
Identifying No.
OP 21-73
Source Name
47th Ann. Fall Mtg., Soc. Petrol. Eng., AIME, San Antonio, Texas, 10/8-11/72, SPE Preprint 4060
State
TX;
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