Research Article
Measurement of Peat Soil Shear Strength Using Wenner Four-Point Probes and Vane Shear Strength Methods
Table 1
Major source of error in the vane shear test.
| Cause | Effect | Influence on Strength Measurement |
| Damaged zone | Disturbed soil excessively | Decreases optimum strength |
| Vane rotated too fast | Soil sheared too fast | Increases |
| Friction between torque rods and soil or casing | Measure torque includes a spurious component of resistance | Increases |
| Poorly calibrated torque measurement | Inaccurate torque | Increases or Decreases |
| Test performed in disturbed soil | Soil structure is broken down | Decreases |
| Isolated gravel/cemented nodules | Measured torque includes a spurious component of resistance | Increases |
| Unknown sand/silt/shell lenses | Drainage during test | Increases |
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