Geokon GK-604D, User Manual

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67
θ Σ
L sin
Probe
Coupling
Bottom Cap
Inclinometer Casing
Backfill
GK-603 Readout
Electrical Cable
True Vertical
Casing Alignment
(exaggerated)
L
θ
θ
L sin
Reading Interval
Borehole
Probe
Guide Wheels
Figure 76 - Inclinometer Survey Description
When all these incremental horizontal deflections are accumulated and plotted
beginning at the bottom of the borehole the net result is to produce a plot of the
change in horizontal deflection between the time of the initial survey and the time of
any subsequent survey (see Figure 77). From such a deflection plot it is easy to see
at which depth the movement is occurring and its magnitude.
Borehole Top
Borehole Bottom
Zone of Movement
+ -
Deflection Change
Figure 77 - Plot of Borehole Deflection
Other methods of analysis can be used but generally add little to the overall
understanding of the situation. For example, using a single set of data, a profile of
the borehole can be created. Also, a plot can be made of the actual change in
reading (inclination) at each measurement depth increment. A plot of this nature
reveals the depths at which movement is occurring. But this information can be
obtained from the change in deflection curve with little difficulty.