Inclinometer Cumulative vs. Incremental Plot HELP
Inclinometer Cumulative vs. Incremental Plot HELP
(OP)
Hi!
I'm a Junior Geotech with about 2 years experience, Geologist by profession; and I'm new at inclinometer monitoring (actually I'm quite new at a lot of Geotech things)
I have a question about Cumulative Displacement graphs:
If I understood the manual correctly, it adds up the displacement from the bottom of the hole upwards? Is that why it always deviates outward from the bottom (sort of like a center of rotation at the bottom?)
and what is the formula? (Baseline Reading - Current Reading? then add them all up from the bottom up)
sorry I'm really confused i actually need to know how it's plotted and calculated.
and about the Incremental Displacement, if I also understood the manual correctly:
It says Incremental displacement = Displacement at Depth - Baseline (or initial) Displacement at Depth
Am I right?
I need more guidance from the experts.
Cheers guys.
Cant upload anything, work-filtered internet.
I'm a Junior Geotech with about 2 years experience, Geologist by profession; and I'm new at inclinometer monitoring (actually I'm quite new at a lot of Geotech things)
I have a question about Cumulative Displacement graphs:
If I understood the manual correctly, it adds up the displacement from the bottom of the hole upwards? Is that why it always deviates outward from the bottom (sort of like a center of rotation at the bottom?)
and what is the formula? (Baseline Reading - Current Reading? then add them all up from the bottom up)
sorry I'm really confused i actually need to know how it's plotted and calculated.
and about the Incremental Displacement, if I also understood the manual correctly:
It says Incremental displacement = Displacement at Depth - Baseline (or initial) Displacement at Depth
Am I right?
I need more guidance from the experts.
Cheers guys.
Cant upload anything, work-filtered internet.
Talk To Other Members
RE: Inclinometer Cumulative vs. Incremental Plot HELP
If you firm doesn't have someone with the correct experience, then you need to hire someone else to interpret the data for you.
Good Luck.
Mike Lambert
RE: Inclinometer Cumulative vs. Incremental Plot HELP
I'm actually just curious about how it's calculated. I already asked them about this one, but their explanation was not too clear. I was trying to look for other help on simpler explanation for me to understand.
Anyway, thanks for the help.
RE: Inclinometer Cumulative vs. Incremental Plot HELP
http://www.slopeindicator.com/pdf/manuals/digitilt-probe.pdf
The basic process is not too difficult and can be put into a spreadsheet. However, there are multiple error correction methods that require special software.
Basically, the accelerometers in the inclinometer probe measure the tilt of the probe. From this you can calculate the deviation between the top set of wheels and the bottom set of wheels. By taking successive readings at different depths, you can calculate the profile of the casing. By comparing different sets of readings, you can calculate the movement of the casing with time.
Yes, the displacements are summed from the bottom. The assumption is that the bottom of the inclinometer casing is in stable ground. This is why it is important that the inclinometer extend deep enough to get into stable ground. If the bottom is not in stable ground, then you have to rely on accurate survey measurements of the top of the casing and back calculate the displacements. Although theoretically possible, this is very difficult to do in practice.
RE: Inclinometer Cumulative vs. Incremental Plot HELP
That explains a lot why we need to add from the bottom-up.
Cheers mate.