Site investigation · Geophysics & monitoring
Inclinometer: displacement profile and rate calculator
From initial and current deviation readings per probe interval (A-axis), the incremental and cumulative displacement, the shear-zone depth and the movement rate.
Standard: Cumulative displacement summed from a fixed base · deviation readings per interval
Open the live calculator → All site investigation calculators
Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Days between initial and current survey | 60 | days |
| Alert rate | 0.5 | mm/day |
| Readings: depth (m), initial deviation (mm), current deviation (mm) — base last | 0.5, 0.1, 0.2 1.0, -0.3, -0.1 1.5, -0.4, -0.2 2.0, -1.9, -1.7 2.5, -0.3, -0.1 3.0, -1.2, -1.1 3.5, 0.2, 0.4 4.0, 1.1, 1.2 4.5, 0.4, 0.5 5.0, 2.0, 2.1 5.5, 0.1, 0.2 6.0, 0.3, 0.5 6.5, -0.3, -0.1 7.0, -1.7, -1.5 7.5, -0.4, -0.2 8.0, -1.6, 1.4 8.5, 0.1, 7.1 9.0, 0.5, 9.5 9.5, 0.5, 4.5 10.0, 2.0, 2.1 10.5, 0.2, 0.3 11.0, 0.9, 1.1 11.5, -0.3, -0.1 12.0, -1.3, -1.1 12.5, -0.5, -0.3 13.0, -1.9, -1.7 13.5, 0, 0.2 14.0, -0.1, 0 14.5, 0.5, 0.6 15.0, 1.8, 1.9 |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Displacement at top | 27.10 | mm |
| Largest incremental movement | 9.00 | mm |
| Shear-zone depth (largest increment) | 9.00 | m |
| Rate at top | 0.452 | mm/day |
- ✓ Rate ≤ alert level
Method, formulas and assumptions
- Displacement at top = INDEX([t.cum],1) = 27.1 mm
- Largest incremental movement = MAX([t.inc]) = 9 mm
- Shear-zone depth (largest increment) = INDEX([t.z],MATCH(9,[t.inc],0)) = 9 m
- Rate at top = 27.1/60 = 0.45167 mm/day
- Bias-shift and rotation errors accumulate over deep casings; apply the usual sum-check corrections to A0/A180 readings before this step.
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.