Relationship between unsaturated soil behavior and engineering problems

The current state of the research on unsaturated soils was reviewed.Then,the relationship between unsaturated soil behavior and engineering problems was discussed.The relevant engineering problems included air and water flow,wetting/drying-induced ground movement,slope stability,earth pressures and bearing capacity in unsaturated soils.Finally,some ideas were proposed on the further research towards the application of unsaturated soil theories in engineering practice.