改进hhu-SH模型及其在面板堆石坝工程中的应用  

Modified hhu-SH model and its application in the concrete-faced rockfill dam

作　　者：王柳江[1,2] 刘啸宇 刘斯宏 扎西顿珠[3] 沈超敏 WANG Liujiang;LIU Xiaoyu;LIU Sihong;TASHI Dunzhu;SHEN Chaomin(College of Water Conservancy and Hydropower,Hohai University,Nanjing 210098,China;International Joint Laboratory of Long-term Behaviour&Environmentally Friendly Rehabilitation Technologies on Dams,Nanjing 210098,China;Tibet Hydraulic Waterpower Planning and Designing Institution,Lasha 850004,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]大坝长效特性及环保修复技术中西联合实验室,江苏南京210098 [3]西藏自治区水利电力规划勘测设计研究院,西藏拉萨850004

出　　处：《河海大学学报（自然科学版）》2023年第2期64-72,共9页Journal of Hohai University(Natural Sciences)

基　　金：国家重点研发计划(2022YFE0105000,2021YFC3090101);国家自然科学基金(52222906,U21A20158,51979091,52009036)。

摘　　要：针对粗粒料的剪胀特性,引入4次幂函数剪胀方程对基于细观结构的粗粒料弹塑性本构模型(hhu-SH基本模型)进行改进,并给出了改进hhu-SH模型屈服函数、硬化参量、初始弹性模量的推导过程以及参数确定方法。基于某抽水蓄能电站下水库面板堆石坝工程,利用其筑坝粗粒料的三轴CD试验和等向压缩试验结果,整理出改进hhu-SH模型的参数,模拟大坝填筑和蓄水过程,并将计算结果与邓肯E-B和南水模型的计算结果进行对比。结果表明:在坝体位移的定性分布规律上,改进hhu-SH模型、邓肯E-B模型以及南水模型的计算结果基本一致,验证了该模型的工程适用性;基于改进hhu-SH模型计算的坝体变形、面板变形和应力以及接缝位移预测值均小于E-B模型,但与南水模型较为接近;基于改进hhu-SH模型计算得到的面板顺坡向应力整体受压,结果更符合实际。To reflect the dilatancy behavior of the coarse-grained materials,the dilatancy equation in the form of the fourth power function was introduced to modify the basic hhu-SH model that is an elastoplastic constitutive model of coarse grains based on the mesoscopic structure.In addition,the yield function,hardening parameter,derivation process of initial elastic modulus,and parameter determination method in the modified hhu-SH model were given.Relying on the concrete-faced rockfill dam(CRFD)in a pumped storage power station,the parameters of the modified hhu-SH model for different coarse-grained materials were determined by using the results of CD triaxial tests and isotropic compression tests.Then,the numerical simulation was conducted to study the stress and deformation of CRFD under the action of filling and impounding.Meanwhile,the calculated results were compared with those by using Duncan E-B model and Shen’s elastoplastic model.It shows that the results obtained from modified hhu-SH model are similar to those of Duncan’s E-B model and Shen’s elastoplastic model in the respect of the distribution of dam deformation,which validates the applicability of the modified hhu-SH model.However,from a quantitative perspective,the deformation of dam,deformation and stress of the concrete-slab,and displacement of the joints calculated by the modified hhu-SH model were smaller than that by Duncan’s E-B model generally,while closer to that of Shen’s elastoplastic model.Furthermore,the stress of the concrete-slab along the slope is the compression stress generally,which is consistent with the monitoring.

关 键 词：粗粒料 改进hhu-SH模型 剪胀方程 数值模拟 面板堆石坝 

分 类 号：TV641.43[水利工程—水利水电工程] TV31