Three-dimensional strain monitor for rock boreholes
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
May 2, 1991
filing date -
May 2, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a device for monitoring strain or deformation within rock boreholes in three-dimension. The device comprises in general a vibrating wire strain monitor for monitoring strain or deformation in an axial direction with respect to the borehole axis interposed between two other vibrating wire string monitors which monitor strain or deformation in radial directions with respect to the borehole axis. The radial vibrating wire strain monitors each have elements by which they may be anchored within a borehole. Together, the three vibrating wire strain monitors monitor strain or deformation in three orthogonal directions within a borehole. The combination allows the axial vibrating wire strain monitor to utilize the radial vibrating wire strain monitor's anchors thereby eliminating their requirement to provide separate anchoring means therefor.
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