Abstract:

The dynamic deformation characteristics of coarse grained material are researched by large-scaled indoor triaxial test. The conclusions are that the dynamic stress-strain relationship of coarse granule doesn’t conform to the presumption of hyperbolic skeleton curve of Hardin-Drnevich under the situation of high stress, because of its volume becoming smaller. Therefore, an exponential stress-strain constitutive equation which reflect the vibration hardening of materials is proposed; the damping of coarse granule doesn’t conform to the Hardin presumption; an power function type of equation based on the experimental references is suggested; the seismic residual deformation of coarse granule is greatly associated with the initial density, static stress, dynamic load, duration of vibration and so on; the relationship between residual deformation and dynamic shearing stress of coarse granule is built considering the effect of initial consolidation confining stress. The research basis is provided for the construction of superhigh rockfill dam in meizoseismal areas.

Key words: hydraulic structure, rockfill dam, coarse grained material, dynamic constitutive relationship, residual deformation