Device and method for determining material strength in situ

Details Device and method for determining material strength in situ Device and method for determining material strength in situ

1980-04-30

1981-11-17

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

73761, 73784, 73790, G01N 308

Patent

active

043003974

ABSTRACT:
A device and method for determining compressive strength of solid matter in situ. One embodiment is particularly advantageous in underground mine roof bolting, where the device can be used to indicate the compressive strength of the rock immediately surrounding the roof bolt anchor. Such compressive strength indication is developed for each bolt installed as it is installed using no machine operator time or effort beyond the time and effort normally used already. The compressive strength indication is developed by monitoring rate of bolt head torque increase with respect to bolt head rotation and relating these to anchor tooth penetration parameters and hence rock compressive strength.

REFERENCES:
patent: 3643501 (1972-02-01), Pauley
patent: 4136556 (1979-01-01), Graham

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