Portable rock strength evaluation device

Details Portable rock strength evaluation device Portable rock strength evaluation device

1996-03-08

1997-09-23

Dombroske, George M.

Measuring and testing

Hardness

By penetrator or indentor

7315209, 73866, G01N 300

Patent

active

056707118

ABSTRACT:
A portable frame that includes a movable support for supporting a cutting tool used for engaging a rock sample, and upon relative movement between the rock sample and the cutter, the cutter will make a constant depth cut at a constant velocity. During the cut, the forces parallel to the direction of displacement and perpendicular to the direction are measured, and both cohesion and internal friction angle, which are parameters characterizing the rock strength, the internal friction angle, which is a true measure of the rock strength, can be determined.

REFERENCES:
patent: 4562726 (1986-01-01), Barnaby
patent: 5216917 (1993-06-01), Detournay
patent: 5323648 (1994-06-01), Peltier et al.
patent: 5415030 (1995-05-01), Jogi et al.
Emmanuel Detournay, Andrew Drescher, Paul Defourny and Dominique Fourmaintraux; "Assessment of rock strength properties from cutting tests: preliminary experimental evidence", Colloquium Mundanum 1995, pp. 1.1.12-1.1.22.
E. Detournay and P. Defourny; "A Phenomenological Model for the Drilling Action of Drag Bits", Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., vol. 29, No. 1, , 1992, pp. 13-22.
J.R. Almenara and E. Detournay; "Cutting experiments in sandstones with blunt PDC cutters", Eurock '92 Thomas Telford London, 1992, pp. 215-220.

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