V1.1
MEMS Digital Portable Horizontal Inclinometer
09/02/2022
56
The position of the tube at a particular depth is represented by
the accumulation of the Deviations at that depth.
To calculate the total deviation from top to bottom use the
following equation:
Tot. Dev. = (MD [email protected] + MD [email protected] + [email protected]….+
MD A@Btm.)
Incremental
Displacement
This refers to CHANGES in the inclination of the tube at any
particular depth. To calculate the Incremental Displacement, it
is necessary to compare the Mean Deviation (Current Data)
values with the Mean Deviation (Base Data) values.
The Incremental Displacement at any depth is calculated using
the following equation (where ‘0.5’ is the selected depth).
Inc Disp(0.5m) = MDev(0.5) - MDev(Base) (0.5)
Cumulative
Displacement
These values are probably the most valuable in any monitoring
exercise. They are simply the accumulation of the CHANGES,
normally from the base of the tube, up to the top, that
represents MOVEMENT of the tube along its length.
To calculate the Cumulative Displacement values simply add
the Incremental Displacement at the base/far end of the
borehole to Incremental Displacement at the next depth
upwards, and continue to the top.
When plotted with zero at the access end of the graph, the ‘Y’
axis represents the Base Data file and the plotted values
indicate the magnitude of the changes (profile of change).
