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作 者:杨贵[1,2] 刘宇 唐晨景 YANG Gui;LIU Yu;TANG Chenjing(Key Laboratory for Geomechanics and Embankment Engineering of Education Ministry,Hohai University,Nanjing 210098,China;Engineering Safety and Disaster Prevention Institute,Hohai University,Nanjing 210098,China)
机构地区:[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学安全与防灾工程研究所,江苏南京210098
出 处:《水利水运工程学报》2025年第2期95-102,共8页Hydro-Science and Engineering
基 金:国家自然科学基金资助项目(51479059)。
摘 要:堆石料作为土石坝的主要构筑材料,其在地震作用下的动变形特性受颗粒形状、级配和相对密度等影响。颗粒形状对堆石料力学特性影响的研究目前主要集中于静力特性,关于动力特性方面的研究相对较少。采用水泥净浆浇筑方法制备了不同形状的人工模拟堆石料并进行动力循环三轴试验,研究了颗粒形状对动残余应变和颗粒破碎的影响。结果表明:采用该方法制备的人工模拟堆石料可以近似反映天然堆石料的动变形特性;在低围压下,残余体积应变随形状系数的增大而减小,在高围压下则规律相反;轴向残余应变随形状系数的增大而先增后减;在相同应力条件下,形状系数越小,颗粒破碎率越低。另外,研究还建立了颗粒破碎率与颗粒形状系数和围压的关系。Rockfill material,as the primary construction material for earth-rock dams,exhibits dynamic deformation characteristics under seismic action that are influenced by particle shape,gradation,and relative density.Current research on the effect of particle shape on the mechanical properties of rockfill mainly focuses on static characteristics,with relatively limited studies on dynamic properties.Artificially simulated rockfill materials of various shapes were prepared using a cement paste casting method,followed by cyclic triaxial tests.The study investigated the effect of particle shape on dynamic residual strain and particle breakage.The results indicate that the artificially simulated rockfill material prepared by this method can approximate the dynamic deformation characteristics of natural rockfill.Under low confining pressure,residual volumetric strain decreases as the shape coefficient increases,whereas under high confining pressure,the opposite trend is observed.Axial residual strain first increases and then decreases with an increase in shape coefficient.Under identical stress conditions,a smaller shape coefficient corresponds to a lower particle breakage rate.Additionally,the study established a relationship between particle breakage rate,shape coefficient,and confining pressure.
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