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Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Frontiers of Structural and Civil Engineering 2010年第1期4卷 78-91页

作者： Erich BAUER Zhongzhi FU Sihong LIU Institute of Applied Mechanics Graz University of TechnologyGrazAustria Institute of Hydraulic Structures Hohai UniversityNanjing 210098China

The wetting deformation of weathered rockfill materials has been attracting growing attention from both engineers and *** importance of realistic predictions of wetting deformations for high earth and rockfill dams is a strong motivation to establish a suitable constitutive ***,the hypoplastic constitutive model by Gudehus and Bauer was extended by introducing solid hardness depending on the state of *** extended model takes into account the influence of the current density,the effective stress state,the rate of deformation,and the time dependent process of degradation of the solid *** the present paper,the performance of this model is evaluated by comparing numerical simulations with experiments obtained from a water sensitive rockfill *** particular,triaxial compression paths and creep deformation under deviatoric stress states are ***,the constitutive model proposed is used to study the influence of a degradation of the solid hardness on the long term behavior of a hypothetical fill dam.

关键词： rockfill dams weathered granular materials hypoplasticity solid hardness creep stress relaxation

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Influence of pressure and density on the rheological properties of rockfills

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Frontiers of Structural and Civil Engineering 2012年第1期6卷 25-34页

作者： Erich BAUER Zhongzhi FU Sihong LIU Institute of Applied Mechanics Graz University of TechnologyGrazAustria Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing210029Ch Institute of Hydraulic Structures Hohai UniversityNanjing 210098China

Long-term deformations of rockfill dams can be related to the type of dam,the pre-compaction achieved during the construction of the dam,the history of loading events,the rheological properties of the rockfill material used,the seepage behavior caused by defects of the sealing,the interactions of the dam building with the foundation,and the hydrothermal phenomena of the stressed rockfill *** present paper investigates the theological propcrtics of coarse grained rockfill materials using a hypoplastic constitutive *** attention is paid to wetting deformation under different deviatoric loading states and *** quantify the state of weathering a so-called“solid hardness”is used in the sense of a continuum *** is shown that an appropriate modeling of wetting deformations requires a unified description of the interaction at least between the state of weathering,the stress state,the density and the rate of *** results obtained from the numerical simulations are compared with available experimental data for a rockfill material used in Xiaolangdi earth dam.

关键词： rockfills solid hardness wetting deformation hypoplasticity creep

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