8
Note that the equations assume a linear relationship between load and gauge readings
over the
full load range
, and the linear coefficient is obtained using regression techniques.
Note that
when using the Calibration Factor obtained from the regression formula it is better to use
the regression zero. This may introduce substantial errors at very low loads.
A measure of
the amount of non-linearity is shown on the calibration report in the column entitled “Linearity”.
4.2 Temperature Correction Factor
Since the vibrating wire has the same temperature coefficient as the steel rockbolt no temperature
correction is required.
4.3 Environmental Factors
Since the purpose of the instrumented rockbolt installation is to monitor site conditions, factors
which may affect these conditions should be observed and recorded. Seemingly minor effects
may have a real influence on the behavior of the rock strata monitored and may give an early
indication of potential problems. Some of these factors include, but are not limited to: blasting,
rainfall, tidal or reservoir levels, excavation and fill levels and sequences, traffic, temperature
and barometric changes, changes in personnel, nearby construction activities, seasonal changes,
etc.
