基于广义塑性模型的高心墙堆石坝反演计算分析  

Back analysis of high earth-rockfill dams based on generalized plastic model

作　　者：张向韬[1] 高溢钊 王翔南[1] 于玉贞[1] ZHANG Xiangtao;GAO Yizhao;WANG Xiangnan;YU Yuzhen(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084)

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2020年第9期88-98,共11页Journal of Hydroelectric Engineering

基　　金：国家重点研发计划(2017YFC0404802);国家自然科学基金(U1965206,51979143)

摘　　要：高堆石坝工程在填筑、蓄水和运行过程中,堆石料常经历复杂多变的应力路径,它所表现出的各向异性和颗粒破碎对其力学特性有明显的影响。采用现有的方法计算高堆石坝变形误差大,其主要原因是目前本构模型在反映堆石料的本质特性方面有待完善。本文构造了各向异性状态参量,定义了参考各向异性状态参数替代基于固定临界状态线的状态参数,可将各向异性、颗粒破碎、复杂应力路径的影响综合考虑到与参考状态线的相对空间位置中。基于参考各向异性状态参数,发展了考虑各向异性和颗粒破碎的堆石料弹塑性本构模型。最后,采用所发展的堆石料广义塑性模型MPZR对已建的糯扎渡高心墙堆石坝进行了应力变形有限元计算分析,并与堆石体内测点的监测值进行对比,验证了模型的可靠性和实用性。During the filling,impoundment and operation of a high rockfill dam,its rockfill materials usually undergo complicated stress paths,and their mechanical properties are significantly affected by anisotropy and particle breakage.In the existing deformation behavior analyses of high rockfill dams,one of the most common errors comes from the drawback of the constitutive models that are unable to sufficiently reflect these essential properties.This paper formulates anisotropic state parameters for the rockfill material and defines a reference anisotropy state parameter to replace the critical state line-based state parameter,so that the calculation of the spatial location relative to the reference state line can fully consider all the effects of anisotropy,particle breakage,and complex stress paths.Then,a generalized plastic MPZR model for rockfill materials is developed.Finally,we use this model and the finite element method to analyze the stress and deformation behaviors of the Nuozhadu high earth-rockfill dam,and verify its reliability and practicability using the calculated rockfill dam body displacements that agree well with the measurements in-situ.

关 键 词：堆石料 各向异性 颗粒破碎 本构模型 高堆石坝 

分 类 号：TV641.1[水利工程—水利水电工程]