Review of geotechnical measurement techniques for a nuclear waste repository in bedded salt Page: 77 of 285
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TABLE 2-1
Sheet B of 15
GEOLOGIC,. GEOPHYSICAL, AND GEODETIC MEASUREMENT TECHNIQUES
Repository Paraneter _Measurement Technique_ _Purpose
Ground Deformation A* Geodetic Methods (Cont'd.)
{Cent*d.)
Staged
Beaver Inclinometer Measure lateral movement B, C, D
underground
Multiple Position Measure strain gra- B, C, D
Borehole Extensometer (MPBX) dients or displacements
in the soil or rocks
Terrametrics Portable Bore- Continuously measure angular B, C„ D
hole Deflectometer variations along the axis of
a borehole
Remarks
A null-balance acceleroneter mounted
inside a probe senses the component
of earth's gravity along its axis* The
equipment is designed to collect and
record data automatically in IBM compat-
ible format for computer processing.
Operates at any angle from vertical to
horizontal. (Precision: 1/1,000 to
1/5,000) (Bromwel1 et al.» 1971)
Several designs are available, including
rod, wire, and prebe types. A recent
development that holds the most promise
consists of permanently installed cir-
cular magnets anchored to the walls
of an uncased borehole and a reed-type
switch acting as a sensor* An optional
micrometer drive head located at the
tap af the extensometer provides very
accurate positions of the switch.
Reliable and relatively inexpensive.
(Precision: 0.5 m to 0.2 mm).
(Burl and et al», 1972; Cording et al«,
1975)
A pivoted joint between the defl ection-am
head and the guide housing allows the de-
flection-arm to deflect with respect to the
guide housing. As the instrument is
moved up or down the cased borehole,
transducers pick up the angular variation
and a continuous profile is obtained.
(Cording et al., 1975)
— P.epoSitory Development Stage: A = Site Selection, B - Construction Authorization, C * Emplacement Authorization, D - Decommissioning Authorization,
~^ Also applicable to ground-water studies.
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Review of geotechnical measurement techniques for a nuclear waste repository in bedded salt, report, December 1, 1979; United States. (https://digital.library.unt.edu/ark:/67531/metadc1093986/m1/77/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.