Geomechanics and Ground Control · Geomechanics · 1 mark · Multiple choice
Two undrained triaxial axial-stress/strain curves for a porous rock are shown. Curve A has pore pressure U = 10 MPa. Which pore pressure best explains curve B?
Curve B reaches a lower axial strength than A. Greater positive pore pressure lowers effective normal and confining stresses for otherwise comparable total-stress conditions, reducing frictional strength. Thus B is associated with U > 10 MPa, option C; a smaller pore pressure would increase effective confinement.
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