Some new clients seem to have diffuculty understanding ADM’s torsion correction function. In this article, we use a simple experiment to explain the torsion correction function of ADM works and its significance in real projects.
There are many reasons for torsion of the inclinometer casing, mainly including the following three aspects:
Bind ADM to a vertical pole and put ADM against a wall at an angle. We can now envisage that ADM is monitoring a slope. The mark line point towards the wall.
Based on the observation chart, we know that, before torsion is developed, the observation data are very stable. We will compare 4 parameters to illustrate the change after torsion happens.
The picture bellow shows the X absolute coordinates in 5 minutes. (X direction is same as the mark-line direction)
The following graph shows the deformation value of X and Y. It can be seen that all deformation value are within 1.5mm.
This 2m length ADMS has totally 4 nodes; with node 220086 being on the top. We can see that the deformation value of node 220086 is within 1.5mm.
We can see that after torsion, absolute value of X is the negative of the value before torsion.
We can see that now the deformation value of X is almost 1.8m, while the deformation value of Y is almost 0.5m; very large values.
We can see that node 220086’s deformation value becomes bigger abruptly, something that is abnormal.
For the ADM monitoring system, it just takes 3 easy steps, to correct the data for torsion and save them.
Based on the test described above, we can see that the torsion of the inclinometer casing has a big effect on the measurement data. When the ADM is rotated 180 degrees, the angle between gravity and ADMS doesn’t change, but the deformation value shows a large change. Therefore, the torsion correction is necessary in horizontal deformation monitoring.
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