高堆石坝流变机理的组构理论分析方法

提出了采用颗粒材料的组构理论分析高堆石坝流变变形机理的方法,从堆石体材料的细观角度探讨堆石集合体的宏观力学和变形响应。现有研究成果表明:仅仅采用孔隙率和干密度不足以完全表达堆石体材料的离散特征,组构分析的张量不仅包含上述宏观指标所表达的力学意义,而且还包含堆石体在空间的分布情况。组构张量包含以下具体涵义:堆石体颗粒本身的几何特征、堆石体在空间的分布、堆石体颗粒间的相互作用等。堆石体组构张量与应力张量和应变张量有密切的关系,从组构张量的变化可以导出堆石体的变形机理和规律,从而揭示堆石体材料流变变形的细观机理。

Fabric theory on creep deformation mechanism for high rockfill dams

An analytic method of fabric theory for granular materials was presented to study the creep deformation mechanism for high rockfill dams.Macro mechanics and deformation response of rockfill assemblies were discussed from the microcosmic point view.It was shown by recent studies that only the void factor and the dry density could not describe the discrete characteristics of rockfill materials completely.The analytic method of fabric theory included not only the mechanical meaning of the above macro indices but also the distributing state of rockfill in space.Fabric tensors included geometical characteristics of rockfill granules,interaction among granules and distributing state of rockfill granules in space.The osculating relation existed between rockfill fabric tensors and stress tensors,which had been theoretically proved.So the creep mechanism and the deformation law of rockfill could be gained from the variation of fabric tensors,and thus the creep mechanism of rockfill might be revealed from the microcosmic view.