Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1984-05-21
1985-09-10
Birmiel, Howard A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73 84, 73841, 73784, G01N 324
Patent
active
045398518
ABSTRACT:
A device for determining the shear strength of rock and soil is disclosed. The device includes means for supporting the device within a borehole, a primary shaft, a plurality of shearing units slidably attached to the shaft having shear heads which are movable from a retracted position to a material-engaging expanded position, and a slip joint between adjacent shearing units such that the units operate independently from one another. The shearing units apply progressively greater normal forces on the material to be tested and sequentially shear the material being tested.
In operation, the device is lowered into a borehole. Then the shearing units are moved from their retracted position to their expanded material-engaging position so as to apply progressively greater normal forces on the material to be tested. An axial force is then applied to the shaft so that the material engaged by the shearing unit closest to the anchor shears. After the material shears, the respective heads of the shearing unit are retracted and the axial force is transferred to the next adjacent shearing unit by means of the slip joint. After the material engaged by each of the shearing units is successively sheared, the shearing characteristics of the material may be determined from the known applied normal and shear forces.
REFERENCES:
patent: 2927459 (1960-03-01), Farrington
patent: 2957341 (1960-10-01), Menard
patent: 3175392 (1965-03-01), Tharalson
patent: 3562916 (1971-02-01), Duckworth
patent: 3572114 (1971-03-01), Ruppeneit et al.
patent: 3796091 (1974-03-01), Serata
patent: 4075885 (1978-02-01), Handy
Birmiel Howard A.
Iowa State University & Research Foundation, Inc.
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