非线性剪胀模型土石坝变形计算适用性评价  

Evaluation of nonlinear elastic constitutive model incorporating dilatancy for rockfill dam deformation simulations

作　　者：王克 汤洪洁 王睿[1,2,3] 张建民 WANG Ke;TANG Hongjie;WANG Rui;ZHANG Jianmin(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Hydrosphere Sciences of the Ministry of Water Resources,Tsinghua University,Beijing 100084,China;General Institute of Water Conservancy and Hydropower Planning and Design,Beijing 100120,China)

机构地区：[1]清华大学水圈科学与水利工程全国重点实验室,北京100084 [2]清华大学水利水电工程系,北京100084 [3]清华大学水利部水圈科学重点实验室,北京100084 [4]水利部水利水电规划设计总院,北京100120

出　　处：《水力发电学报》2024年第2期99-109,共11页Journal of Hydroelectric Engineering

基　　金：国家科学自然基金(52022046,52038005)。

摘　　要：以有限元方法为代表的高土石坝变形数值模拟的准确性极大依赖于本构模型对坝料应力应变关系描述的准确性。本文在邓肯-张EB模型基础上,建立了用于分析坝体变形的考虑剪胀的实用性非线性模型(EB-Dilatancy模型,简称为EBD模型)。基于阿尔塔什面板砂砾石坝的大坝变形监测数据,设计了3个反演方案,获得最优的EB模型和EBD模型参数。采用最优参数模拟常规三轴试验,并与实际物理试验进行比较。结果表明:在坝体变形方面,传统的EB模型难以同时准确模拟堆石坝的沉降和水平变形分布,而EBD模型则能够在维持沉降分布模拟精度的基础上提高水平变形的计算精度;EB模型无法实现在合理模拟大坝变形的前提下有效模拟材料单元应力-应变响应,相比之下EBD模型可以同时实现大坝变形和材料单元力学行为的良好模拟。The accuracy of numerical simulations of the deformation of high rockfill dams,represented by the finite element method,depends on the constitutive model.This paper develops a practical nonlinear elastic constitutive model incorporating dilatancy,namely the EBD model,for rockfill dam deformation simulations based on the Duncan-Chang EB model.Using the deformation monitoring data of the Aertashi concrete faced rockfill dam,we design three inversion cases and obtain the optimal parameters of both the constitutive EB model and EBD model via inversion analysis.Then,corresponding triaxial compression tests are simulated numerically and compared against experimental measurements.The results indicate that at the structural level,the traditional EB model is not acceptable when the distributions of both settlement and horizontal deformation are simulated,while the EBD model improves the simulation accuracy of horizontal deformation while maintaining the accuracy of settlement.We find the EB model parameters that allow for acceptable deformation simulations will result in poor simulations of element level stress-strain behaviors.In contrast,the EBD model can achieve good simulations of dam deformation and element level stress-strain behaviors simultaneously.

关 键 词：高土石坝 本构模型 剪胀 变形监测 反演分析 三轴试验 

分 类 号：TV641.1[水利工程—水利水电工程]