Abstract
Deformation in collapse has been studied with a triaxial test apparatus modified for unsaturated soil. Wetting tests, in which the condition of suction and stresses were known, were conducted under isotropic stress state for compacted clay specimens. Deformation, absorption and appricability of the ordinary constitutive model for unsaturated soils are discussed for the test results. It was found out that collapse, which occurred under isotoropic stress state, has similar tendency with that measured with oedmeter type test apparatus in past, and that shear deformation after collapse in different stress paths agrees with expectation by the ordinary constitutive model.
