What Is the Marchetti Flat Dilatometer Test?
The Marchetti (the 1980's — the DMT's; the flat) is the dilatometer (the blade's — the 95mm; the driven) that measures (the A/B — the lift-off; the 1.1mm) to derive (the ID/KD/ED — the indices'; the M/Su's). The test: the blade's (the driven — the 20cm's; the intervals), the membrane's (the 1mm — the expanded; the A/B's), and the 2-minute (the speed's — the 60-foot's — the hour). The soil's — the flat tested.
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The Marchetti's procedure
The blade (the 95mm — the 14mm; the driven), the A (the lift-off's — the 0.05mm; the total's — the corrected), the B (the 1.1mm's — the expansion's; the corrected), the C (the closing's — the optional; the u0's), and the 20cm (the intervals' — the 2-minute's; the continuous's — the quasi).
The derived parameters
The ID (the material's — the 0.1-10's; the clay's/sand's), the KD (the stress's — the 2-20's; the OCR's — the history), the ED (the dilatometer's — the modulus; the 1-100 MPa's), the M (the constrained's — the RM*ED; the 1D's), the Su (the undrained's — the 0.22's — the sigma'vo; the clays'), and the phi (the safe's — the 28-45's; the sands').
The SDMT and practice
The seismic (the SDMT's — the 2-geophone's; the Vs's), the G0 (the small-strain's — the Vs²; the modulus), the liquefaction (the KD's — the CRR's; the screening), the 40-year (the track's — the 1980's; the validated), and the US (the DOT's — the 30's; the specified). The Marchetti is the standard — the flat's 40 years.
The bottom line
Run Marchetti DMT (A/B/C pressures at 20cm intervals, 2 min/test) for ID/KD/ED → M (1D settlement), Su, and φ — add seismic module (SDMT) for Vs/G0; KD screens liquefaction.
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