Stress and deformation of high earth and rock-fill dams

The author’s recent works on the problems which influence computation results of stress and deformation of earth and rock-fill dams significantly are introduced.First,the differences between Duncan’s hyperbolic E-ν model and E-B model,the influences of the differences on computed results and their application conditions are analyzed.And the properties of the softness matrix of soils are proposed on the basis of the true triaxial tests.Secondly,the long-term deformation affected by cycling rainfall is studied.It can be taken as part of the rheological deformation.The tests and computing methods are proposed.Thirdly,two analytic methods of hydraulic fracture are proposed.One is to combine the effective method and the total stress method.The simplified computation of consolidation of unsaturated soil is performed,in which the pore water and air are taken as a mixed fluid to set up the consolidation equation.The total stress is the sum of the calculated effective stress and the pore water pressure.The hydraulic fracture is judged by comparing the total stress with the water pressure before the core wall.The other method is the total stress method which can approximately reflect the consolidation to a greater or lesser extent during the construction period.The corresponding parameters of constitutive models are determined based on the consolidated undrained tests.