Borehole inclinometer monument for millimeter horizontal geodetic control accuracy

Details Borehole inclinometer monument for millimeter horizontal geodetic control accuracy Borehole inclinometer monument for millimeter horizontal geodetic control accuracy

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2159b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2159-2162

Physics

1

Boreholes, Distance Measuring Equipment, Drilling, Earth Surface, Error Analysis, Geodesy, Controllability, Horizontal Distribution, Portable Equipment, Position (Location), Surface Stability

Scientific paper

A geodetic monument is described whose horizontal position may be monitored relative to points 30 m deep to an accuracy of 0.5 mm, and to points more than 2 km to a potential accuracy of 2 mm. The monument incorporates a 7 cm diameter borehole lining equipped with orthogonal alignment grooves that guide a portable inclinometer during measurements. The inclinometer is raised incrementally from the base of the hole to measure the tilt of contiguous 0.5-m-long segments of the borehole prior to geodetic occupation. Integrating the results yields a measure of the surface monument's position. Random errors increase with the square root of the number of downhole measuremnts N as 0.03 square root of N mm (N=2d for d-m-deep hole). Systematic errors are approximately 0.02% of the lateral offset of the base of the hole relative to the surface monument. Unlike previous monuments the inclinometer-based system permits surface and subsurface instability to be characterized, and the effectiveness of the monument to be monitored.

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