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Abstract

The underground excavations in salt and potash mines, or at a great depth, deform time-dependently and the deformation rate is strongly dependent on the measuring time interval. In order to achieve a reliable deformation rate curve without a fluctuation, it is highly recommended to measure the deformation with an optimum measuring time interval, which is dependent on the in situ noise level of the instrument. In this study, a novel method for determining the noise level of an instrument using a fractal analysis was suggested. Furthermore, several methods for determining the optimum measuring interval for the instrument were suggested by using the instrument's noise. The deformation measurements used in this study are from the Waste Isolation Pilot Plant (WIPP), which is a radioactive waste repository in a salt bed at a depth of about 650 m below the surface in New Mexico, USA.

Keywords

FRACTAL ANALYSIS SALT AND POTASH MINES MEASURING TIME INTERVAL DEFORMATION RATE CURVE

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References

BIZJAK

K. F.

and PETKOVS

: ‘Displacement analysis of tunnel support in soft rock around a shallow highway tunnel at Golovec’, Eng. Geol., 2004, 75, 89–106.

BOADU

F. K.

and LONG

L. T.

: ‘The fractal character of fracture spacing and RQD’, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 1994, 31, 127–134.

BROWN

E. T.

: ‘Geotechnical monitoring in surface and underground mining – an overview’, Geotechnical Instrumentation and Monitoring in Open Pit and Underground Mining. Rotterdam, Balkema, 1993, 3–11.

HSIUNG

S. M.

, GHOSH

and CHOWDHURY

A. H.

: ‘On natural rock joint profile characterization using self affine fractal approach’, Proc. 35th U.S. Symp. on Rock Mechanics, University of Nevada, Reno, 1995, 681–687.

KOVARI

and AMSTAD

: ‘Decision making in tunneling based on field measurements’, Compressive Rock Eng., 1993, 4, 571–606.

KWON

: ‘An investigation of the deformation of underground excavations in salt and potash mines’, unpublished PhD thesis, University of Missouri–Rolla, 1996.

KWON

and WILSON

J. W.

: ‘Deformation mechanism of the underground excavations at the WIPP site’, Rock Mech. Rock Eng., 1999, 32, 101–122.

P. R. LAPOINTE: ‘A method to characterize fracture density and connectivity through fractal geometry’, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 1988, 25, 421–429.

LEE

Y. H.

, CARR

J. R.

, BARR

D. J.

and HAAS

C. J.

: ‘The fractal dimension as a measure of the roughness of rock discontinuity profile’, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 1990, 27, 453–464.

10.

LEI

, MASUDAA

, NISHIZAWAC

, JOUNIAUSD

, LIUB

, MAB

.: ‘Detailed analysis of acoustic emission activity during catastrophic fracture of faults in rock’, J. Struct. Geol., 2004, 26, 247–258.

11.

MALINVERNO

: ‘A simple method to estimate the fractal dimension of a self-affine series’, Geophys. Res. Lett., 1990, 17, 1953.

12.

MANDELBROT

B. B.

: ‘How long is the coast of Britain? Statistical self-simility and fractal dimension’, Science, 1967, 155, 636–638.

13.

RUSS

J. C.

: ‘Fractal surfaces’, New York, Plenum, 1994.

14.

DOE

U. S.

: ‘Geotechnical field data and analysis report’, DOE/WIPP 92-010, 1992.

Investigation of the influence of a measuring time interval on in situ deformations using a fractal analysis

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