基于塑性损伤模型的坝基深埋混凝土防渗墙力学行为研究  

Study on Mechanical Behavior of Deep Buried Concrete Cut-off Wall in Dam Foundation Based on Plastic Damage Model

作　　者：王兴辰 孙新建[1,2,3] 李国超 WANG Xing-chen;SUN Xin-jian;LI Guo-chao(School of Civil Engineering and Water Resources,Ministry of Water Resources,Qinghai University,Xining 810016,China;Laboratory of Ecological Protection and High-Quality Development in the Upper Yellow River,Ministry of Water Resources,Qinghai University,Xining 810016,China;Key Laboratory of Water Ecology Remediation and Protection at Headwater Regions of Big Rivers,Ministry of Water Resources,Qinghai University,Xining 810016,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]青海大学土木水利学院,青海西宁810016 [2]青海大学黄河上游生态保护与高质量发展实验室,青海西宁810016 [3]青海大学水利部江河源区水生态治理与保护重点实验室,青海西宁810016 [4]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《水电能源科学》2025年第1期122-126,共5页Water Resources and Power

基　　金：国家自然科学基金项目(52379127)。

摘　　要：深厚覆盖层中的防渗墙在多荷载共同作用下易产生较大变形,极端情况下甚至会出现严重损伤或开裂。为探讨不同防渗墙材料性能对其变形及损伤的影响,基于Lee-Fenves塑性理论,建立了坝基深埋混凝土防渗墙塑性损伤模型,揭示了防渗墙损伤规律及机理,并以新疆某土石坝设置的186 m深防渗墙为例,研究了5种弹性模量和3种泊松比对防渗墙墙体竖向位移、向下游水平位移及损伤分布的影响。结果表明,防渗墙的损伤主要集中于墙体与基岩接触区域;弹性模量对防渗墙的竖向位移、应力及损伤影响显著;泊松比仅对防渗墙的位移及应力状态有轻微影响,但对墙体损伤情况无显著影响。研究结果可为同类工程中防渗墙的前期设计及后期维护提供支撑。The cut-off wall in the deep overburden layer is prone to large deformation under the combined action of multiple loads,and even serious damage or cracking may occur in extreme cases.In order to explore the influence of dif-ferent material properties of cut-off wall on its deformation and damage,based on Lee-Fenves plastic theory,a plastic damage model of deep buried concrete cut-off wall in dam foundation is established.The damage law and mechanism of cut-off wall are revealed.Taking the 186 m deep cut-off wall set up in an earth-rock dam in Xinjiang as an example,the effects of five elastic moduli and three Poisson's ratios of cut-off wall on the vertical displacement,downstream horizontal displacement and damage distribution of the wall are studied.The results show that the damage of the cutoff wall is main-ly concentrated in the contact area between the wall and the bedrock.The elastic modulus has a significant effect on the vertical displacement,stress and damage of the cut-off wall.Poisson's ratio only has a slight effect on the displacement and stress state of the cutoff wall,but has no significant effect on the damage of the wall.The research results can pro-vide support for the preliminary design and later maintenance of the cut-off wall in similar projects.

关 键 词：塑性损伤模型 深厚覆盖层 防渗墙 弹性模量 

分 类 号：TV641.4[水利工程—水利水电工程]