Strength and Stiffness Properties of an Unsaturated Clayey Silt: Experimental Study at High Degrees of Saturation

Unsaturated constant water content triaxial compression tests with suction measurement, using an Imperial College tensiometer, and saturated consolidated undrained were conducted on reconstituted brickearth, a naturally unsaturated clayey silt from London. The results show that the effective stress can be applied to critical state line (CSL) normalized stiffness for brickearth but Bishop's variable gives slightly improved CSL. derived local instrumentation demonstrates is also beneficial normalizing modulus over small-strain range (up axial strains of about 3%).