高堆石坝流变机理的组构理论分析方法
首发时间:2006-07-20
摘要: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体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。
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Fabric Theory on Creep Deformation Mechanism for High Rockfill Dam
Abstract:Analysis method of fabric theory for granular materials is presented to apply on studying creep deformation mechanism for high rockfill dam. Macro mechanics and deformation response of rockfill assemblies are discussed from microcosmic point view. Recent study results show that only void factor and dry density can not enough describe the discrete characters of rockfill materials completely. Analysis method of fabric theory not only includes mechanic meaning of the above macro index but also distributing state in space. Fabric tensor includes geometry character of rockfill granule, interaction among granules and distributing state in rockfill granule assemble space. The osculating relation exists between rockfill fabric tensor and stress tensor, which have been proved theoretically in this paper. So creep mechanism and deformation law of rockfill can be gained from varying of fabric tensor. As a result creep mechanism of rockfill creep may be revealed from microcosmic view.
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