What Is Constrained Modulus From the Dilatometer?
M (the DMT's — the 1D; the RM*ED) is the dilatometer's (the constrained — the modulus; the 1D) derived from (the ED's — the 34.7*(B-A); the RM's — the ID/KD's). The modulus: the ED's (the 34.7*(B-A)'s; the dilatometer's), the RM's (the 0.14-3.5's — the ID/KD's), the M's (the RM*ED's — the 1D's), and the s's (the settlement's — the sigma_v*M's; the 1D's). The soil's — the 1D compressed.
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How M is derived
The ED (the 34.7*(B-A)'s — the dilatometer's; the 1-100 MPa's), the RM (the 0.14-3.5's — the ID/KD's; the 1980's — the Marchetti's), the M (the RM*ED's — the 1D's; the constrained's), the 1D (the oedometer's — the equivalent; the 5 MPa's), and the 20cm (the intervals' — the 2-minute's; the continuous's).
The RM's values
The 0.14 (the clay's — the ID<0.6; the NC's), the 3.5 (the sand's — the ID>3.0; the OC's), the 1.0 (the silt's — the 1.2-1.8's; the 2's), the KD (the stress's — the 2-20's; the RM's), and the 1980 (the Marchetti's — the 40-year; the validated).
Settlement use
The s (the sigma_v*M's — the 1D's; the 25mm's), the 25mm (the limit's — the 1-inch's; the footings'), the 1D (the 1-inch's — the 25mm's; the 90%'s — the consolidation's), the 40-year (the track's — the 1980's; the validated), and the 2-minute (the test's — the 60-foot's; the hour). The M's — the settlement's modulus.
The bottom line
Compute DMT constrained modulus M = RM·ED (ED = 34.7(B−A), RM 0.14-3.5 by ID/KD) — run 1D consolidation settlement s = Σ(σv·Δz/M), targeting <25 mm for footings; 40-year validated.
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