Experimental study of generalized SWCC of unsaturated sand and containing clay

Using four consolidation apparatus and triaxial instrument for unsaturated soils, they have advantages that could measure volume change and take into account effect of net mean stress that pressure plate apparatus could not. A seriers of tests with considering and without considering net normal pressure or net mean stress about generalized SWCC, are carried out. Test studies indicate that net normal pressure or net mean stress plays an important role in the SWCC. The test results are consistent with the theoretical formula. Combining unsaturated soils theories with practices, a formula of generalized SWCC under without considering and considering net normal pressure or net mean stress affect. Test results well agree with theoretical formula.