Bore hole rock shear tester and method for using same

Details Bore hole rock shear tester and method for using same Bore hole rock shear tester and method for using same

1984-05-14

1985-12-10

Birmiel, Howard A.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Earth stresses

73 84, 73845, G01N 324, G01N 3324

Patent

active

045571473

ABSTRACT:
The bore hole rock shear testing device of the present invention comprises a case assembly having a longitudinal axis, a driving block, at least one wedge member, and a restraint member. The wedge member is positioned between the restraint member and the driving block and includes a rock engaging surface facing radially outwardly from the longitudinal axis of the case assembly. The driving block and the wedge member have complimentary tapered surfaces which cause the rock engaging surface to be urged radially outwardly when the wedge member is compressed or squeezed between the driving block and the restraint member. Power means are provided for moving the driving block toward the restraint member, and a restraint mechanism selectively holds the restraint member against movment. The restraint mechanism is movable to an inoperative position which results in both outward radial forces and axial forces being applied simultaneously to the rock engaging surface when the driving block is moved toward the wedge member and the restraint member.

REFERENCES:
patent: 3349610 (1967-10-01), Noel
patent: 3427871 (1969-02-01), Handy
patent: 3610035 (1971-10-01), Handy
patent: 3673861 (1972-07-01), Handy
patent: 4030345 (1977-06-01), Edmond
patent: 4075885 (1978-02-01), Handy

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