What Is Creep Pressure in a Pressuremeter Test?
Creep (the pf's — the 60-second; the volumetric) is the pressuremeter's (the 60-second — the creep's; the Ménard's) pressure where (the volume's — the time's; the 30-60s) stabilizes between (the p0's — the at-rest; the pl's — the limit). The pressures: the p0's (the lift-off's — the Ko's), the pf's (the creep's — the 60's; the yield's), the pl's (the limit's — the 1/V0's), and the Em's (the 2.66Vm's — the modulus). The soil's — the creep defined.
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The p0/pf/pl
The p0 (the lift-off's — the at-rest's; the Ko's), the pf (the 60-second's — the creep's; the yield's — the pseudo-elastic's), the pl (the 1/V0's — the limit's; the extrapolated), the Em (the 2.66Vm's — the Ménard's; the modulus), and the 60-second (the increments' — the creep's; the volumetric's).
How pf is found
The 60-second (the readings' — the 30/60's; the creep's), the volumetric (the curve's — the time's; the stabilized), the yield (the pseudo-elastic's — the end's; the pf's), the 2.66 (the Vm's — the (pf+p0)/2's; the Em's), and the 30-minute (the test's — the 1's; the Ménard's).
Design use
The q_ult (the pl/9's — the bearing's; the 3's — the FS), the s (the Em/alpha's — the settlement's; the 1D's), the alpha (the 1/3-1's — the rheological's; the clay's — the 2/3), the piles' (the Bustamante's — the pl's; the direct's), and the 1955 (the Ménard's — the 70-year; the validated). The pf's — the yield's pressure; the pl's — the limit's.
The bottom line
Read pf (creep pressure) as the end of the pseudo-elastic phase on the 60-sec volumetric curve between p0 (at-rest) and pl (limit) — compute Em = 2.66Vm, design footings at q_ult ≈ pl/9 with settlement from Em/α.
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