The 'pressuremeter test' (PMT) in a borehole measures:
Choose the correct answer
Vertical stress at depth only
In-situ horizontal stress and soil stiffness from inflating probe against borehole wall — limit pressure and pressuremeter modulus
Only soil moisture content
Shear strength by driving a cone
Correct Answer
B. In-situ horizontal stress and soil stiffness from inflating probe against borehole wall — limit pressure and pressuremeter modulus
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Pressuremeter: cylindrical probe inflated in borehole under controlled pressure. Measures volume of water pumped in vs pressure applied → pressure-volume curve. From curve: (1) Limit pressure pL (equivalent to passive resistance); (2) Ménard pressuremeter modulus EM (soil stiffness); (3) KH0 (at-rest horizontal stress from lift-off pressure). Used for: foundation design in French practice (Ménard), pile design (semi-empirical), creep coefficient for settlements.
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