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.
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