What Is the Self-Boring Pressuremeter Test (SBPMT)?
SBPMT (the Cambridge's — the 1970's; the self-bored) is the pressuremeter (the inserted — the drilled; the minimal) that bores (the itself — the cutter; the 83mm) into (the soil's) to measure (the G0/Su — the small-strain; the in-situ). The test: the boring's (the self's — the disturbance's — the minimal), the unload-reload's (the G0's — the 2-3's; the loops'), and the 2-hour (the duration's — the 1-test's). The soil's — the self-bored.
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How SBPMT works
The cutter (the 83mm's — the self's; the bored), the insertion (the minimal's — the disturbance's; the pushed), the membrane (the 360°'s — the expanded; the strain's — the 10%), the unload-reload (the 2-3's — the loops'; the G0's), and the 2-hour (the test's — the 1's; the dissipation's — the included).
The parameters
The G0 (the small-strain's — the unload's; the 100 MPa's), the Su (the undrained's — the Gibson/Anderson's; the 1972's), the p0 (the at-rest's — the lift-off's; the Ko's), the OCR (the Mayne's — the 1980's; the G0's — the correlated), and the phi (the Bolton's — the 1986's; the sands').
Vs. Ménard
The SBPMT's (the G0's — the small-strain's; the research's), the Ménard's (the Em's — the design's; the 70-year's), the 2-hour (the SBPMT's — the 1's; the Ménard's — the 30-minute), the cost (the 5x's — the SBPMT's; the specialized), and the UK (the practice's — the specified; the soft's — the clay). The SBPMT is the research's — the G0's gold.
The bottom line
Use SBPMT (self-bored 83mm, unload-reload loops) for G0 small-strain stiffness, Gibson/Anderson Su, and Ko — the reference in-situ test for soft clays; ~5x the cost of Ménard PMT, 2 hours per test.
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