What Is a Vane Shear Test in Geotechnical Engineering?
Vane shear (the field's — the Su's; the ASTM D2573) measures (the undrained — the soft clays'; the in-situ) by rotating (the 4-blade — the vane; the torque's) in (the soil's). The test: the torque's (the Su's — the computed), the remolded's (the sensitivity's — the St), the rate's (the 6°/min — the standard), and the rod's (the friction's — the corrected). The soft clay's — the directly tested.
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How vane shear works
The vane (the 4-blade — the 65x130mm; the pushed), the torque (the rotated — the 6°/min; the measured), the Su (the torque's — the computed; the K's — the constant), the remolded (the 10x — the rotated; the St's — the sensitivity), and the rod (the friction's — the corrected; the slip's — the coupling's).
The results
The Su (the undrained — the peak's; the corrected's — the mu), the St (the sensitivity's — the peak/remolded; the 1-16's), the mu (the Bjerrum's — the correction; the PI's — the 0.5-1.0), and the profile (the 1m — the intervals; the stratigraphy).
Applications and limits
The embankments' (the stability — the staged; the Su's), the soft (the clays' — the 500 psf's; the measured), the limits (the 1,000 psf's — the above; the SPT's), the CPT's (the correlated — the Nkt's; the 10-20's), and the lab (the UU's — the compared; the disturbance's). The vane is the soft clay's — the Su direct.
The bottom line
Use field vane shear (ASTM D2573, 6°/min) for in-situ Su of soft clays — apply Bjerrum μ correction by PI, get sensitivity from remolded test; correlate to CPT via Nkt 10-20.
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