粗粒筑坝材料的增量流变模型研究  

Study of incremental rheological model of coarse grained material for embankment

作　　者：朱晟[1,2] 王永明[1,2] 徐骞[1,2] 

机构地区：[1]河海大学水文水资源与水利水电工程科学国家重点实验室,南京210098 [2]河海大学水工结构研究所,南京210098

出　　处：《岩土力学》2011年第11期3201-3206,共6页Rock and Soil Mechanics

基　　金：国家科技支撑计划课题(No.2008BAB29B02)

摘　　要：针对全量型流变模型与加载应力路径无关,不能考虑施工或蓄水期在变应力作用下土石坝流变遗传特性的问题,基于继效理论,结合某工程堆石料的三轴流变试验资料,提出了适合于土石坝筑坝材料流变特性分析的7参数增量流变模型;利用试验各级增量荷载作用下的最终体积流变量与对应体积应力之间为近似线性关系,最终剪切流变量与对应的试验广义剪应力之间接近双曲线关系,整理得到其流变体积模量和剪切模量等模型参数;验证分析表明,建议的增量流变模型计算值与试验结果吻合较好,其可应用于实际土石坝的流变研究。Considering that total rheological model is independent of stress path and rheological genetic characteristic of rockfill dam is omitted,a seven-parameter incremental rheological model which is more suitable for the rheological analysis of coarse grained material is achieved based on the theory of hereditary creep.The analysis of normal triaxial rheological test data of some rockfill indicates that： the linear function could be adopted to fit the relationship between ultimate volume rheological deformation and corresponding volume stress,and hyperbola function could be adopted to fit the relationship between ultimate shear rheological deformation and corresponding generalized shear stress;so rheological volume modulus and shear modulus of coarse grained materials could be calculated based on the above-mentioned functions.Finally,a verification analysis is done;it could be concluded that the incremental rheological model approximately agrees with the experimental results;and it can be applied to earth dam projects.

关 键 词：土石坝 粗粒材料 增量分析 流变 本构模型 

分 类 号：TV223[水利工程—水工结构工程]