Modified borehole shear tester

Details Modified borehole shear tester Modified borehole shear tester

1987-06-12

1988-09-27

Levy, Stewart J.

Measuring and testing

Hardness

By penetrator or indentor

73784, G01N 300

Patent

active

047732598

ABSTRACT:
A conventional borehole shear tester is modified by incorporating a volume-monitoring accessory in the non-pressurized chamber vent line. This accessory includes a fluid reservoir operatively connected to the non-pressurized chamber of the shear head unit. A change in the level of fluid in the reservoir indicates changes in the volume of the non-pressurized chamber, which in turn indicates a change in shear head diameter. By maintaining a constant fluid level in the reservoir, the volume of the non-pressurized chamber remains constant and the shear head diameter remains constant. Thus, with the shear head diameter fixed, the normal pressure exerted on the wall of the borehole varies as the soil dilates or consolidates. Accordingly, the modified borehole shear tester of the present invention simulates friction pile behavior.

REFERENCES:
patent: 3175392 (1965-03-01), Tharalson et al.
patent: 3427871 (1969-02-01), Handy et al.
patent: 3499320 (1970-03-01), Fox et al.
patent: 3673861 (1972-07-01), Handy
patent: 3772911 (1973-11-01), Ruppeneit et al.
patent: 3872717 (1975-03-01), Fox
patent: 4400970 (1983-08-01), Ali
patent: 4539851 (1985-09-01), Lutenegger
patent: 4557147 (1985-12-01), Rohde et al.
"The Modified Borehole Shear Device", J. P. Demartinecourt and Gunther E. Bauer.
"Borehole Shear Test and Slope Stability", Richard L. Handy.

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