考虑防渗墙塑性损伤的深厚覆盖层上沥青混凝土心墙坝应力渗流分析  

Stress Seepage Analysis of Asphalt Concrete Core Wall Dam on Deep Overburden Considering Plastic Damage of Cut-off Wall

作　　者：林恒星 邹浩 冯先伟 孙继文 李文亮 LIN Heng-xing;ZOU Hao;FENG Xian-wei;SUN Ji-wen;LI Wen-liang(Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200434,China;State Key Laboratory of Coastal and Offshore Engineering,Department of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,Department of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [3]大连理工大学水利工程学院工程抗震研究所,辽宁大连116024

出　　处：《水电能源科学》2025年第2期142-146,87,共6页Water Resources and Power

基　　金：上海勘测设计研究院有限公司科研项目资助(2022SD(83)-001)。

摘　　要：深厚覆盖层上建坝常采用混凝土防渗墙作为防渗结构,常规有限元分析对混凝土防渗墙通常采用线弹性本构,导致防渗墙易出现应力超限现象,而实际上,应力超限后混凝土防渗墙会发生塑性损伤,应力会释放并重新分布,因此线弹性模型计算的防渗墙应力不符合实际情况。依托某深厚覆盖层上沥青混凝土心墙坝建立三维有限元模型,对混凝土防渗墙分别采用混凝土塑性损伤和线弹性本构,研究对比防渗墙损伤对沥青混凝土心墙坝应力和渗流的影响。结果表明,采用塑性损伤本构后,防渗墙应力出现重分布,拉压应力有所下降,最大拉应力减小了7.00 MPa,最大压应力减小了3.32 MPa;大坝整体的总水头、压力水头和渗漏量变化不大,防渗墙损伤区域的渗透坡降减小,防渗墙的渗漏量因损伤增大了246.21%,大坝整体的渗漏量仅增大了12.33%。Concrete anti-seepage wall is often used as anti-seepage structure for dams built on deep overburden.Conventional finite element analysis usually adopts linear elastic constitutive model for concrete anti-seepage wall,which leads to stress overrun of anti-seepage wall.In fact,after the stress exceeds the limit,the concrete of the cut-off wall will be plastically damaged,and the stress will be released and redistributed.Therefore,the stress of the cut-off wall calculated by the linear elastic model does not conform to the actual situation.A three-dimensional finite element model is established based on the asphalt concrete core wall dam on a deep overburden layer.The concrete plastic damage and linear elastic constitutive are used to study the influence of anti-seepage wall damage on the stress and seepage of asphalt concrete core wall dam.The results show that after the plastic damage constitutive is adopted,the stress of the cutoff wall is redistributed,the tensile and compressive stress decreases,the maximum tensile stress decreases by 7.00 MPa,and the maximum compressive stress decreases by 3.32 MPa.The total head,pressure head and leakage of the dam as a whole did not change much,and the seepage gradient in the damaged area of the cut-off wall decreased.The leakage of the cutoff wall increased by 246.21%due to the damage,while the overall leakage of the dam increased by only 12.33%.

关 键 词：沥青混凝土心墙坝 三维有限元模型 防渗墙 应力 渗流 

分 类 号：TV698.23[水利工程—水利水电工程]