A state dependent constitutive model for unsaturated soil-steel interfaces considering bonding effect

The frictional behaviours between unsaturated soils and structure are controlled mainly by the complex phenomena that develop within a thin soil layer close to contact area. constitutive model for soil-structure interfaces (SSI) must be established predict performance of related soil-structuresystems accurately. Multi-stage suction-controlled ring shear (RS) tests with three different upper annular platens were carried out on an equal number statically compacted samples Shanghai clay under suction states given net normal stress. A state dependent based critical concept considering bonding effect was proposed. In all stress conditions, tested predicted results smooth interface rough well matched.