Borehole strain monitor for soft rock

Details Borehole strain monitor for soft rock Borehole strain monitor for soft rock

1989-10-23

1991-09-17

Raevis, Robert

Measuring and testing

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

Earth stresses

G01B 716

Patent

active

050483447

ABSTRACT:
A borehole strain monitor for soft rock consisting of a sensing unit, an installation/retrieval provision and a read-out unit. The sensing unit has a U-shaped yoke and is fitted with a vibrating wire transducer. A magnetically coupled variable frequency oscillator determines the point of resonance for the tensioned wire. The resonant frequency is measured with a frequency counter. The sensing unit is used, typically, in boreholes between two and six inches in diameter. The unit is firmly seated in the borehole by means of a pad at one side and a positively guided wedge at the other to bring the unit in contact with diametrially opposed portions of the borehole wall.

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