Method of testing the integrity of installed rock bolts

Details Method of testing the integrity of installed rock bolts Method of testing the integrity of installed rock bolts

1977-02-22

1977-12-13

Myracle, Jerry W.

Measuring and testing

Ductility or brittleness

73582, G01N 2900

Patent

active

040622290

ABSTRACT:
The bond integrity of resin grouted rock bolts or roof bolts anchored within the ceiling in underground mines is tested by inducing broadband vibrations and measuring the resonant frequencies of the axial and transverse vibration modes. Voids in the resin grout or imperfect bonding cause shifts in the resonant frequencies. The tension in expansion nut rock bolts is determined from the resonant frequency of the transverse vibration mode.

REFERENCES:
patent: 3307393 (1967-03-01), Kessler
patent: 3960009 (1976-06-01), Roepke et al.
patent: 3975948 (1976-08-01), Makino et al.

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