深厚覆盖层上土石坝混凝土防渗墙损伤分析及性能评价  

Damage Analysis and Performance Evaluation of Concrete Cut-off Wall of Rockfill Dam on Deep Overburden

作　　者：孙继文 叶岩 屈永倩 熊志豪 邹德高[1,2] 冯先伟 SUN Ji-wen;YE Yan;QU Yong-qian;XIONG Zhi-hao;ZOU De-gao;FENG Xian-wei(State Key Laboratory of Coastal&Offshore Engineering,School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;Shanghai Investigation Design&Research Institute Corporation Limited,Shanghai 200434,China)

机构地区：[1]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 [2]大连理工大学水利工程学院工程抗震研究所,辽宁大连116024 [3]上海勘测设计研究院有限公司,上海200434

出　　处：《水电能源科学》2025年第1期117-121,共5页Water Resources and Power

基　　金：国家自然科学基金项目(52109151,52192674,U23B20149);西藏自治区重点研发计划(XZ202201ZY0017G)。

摘　　要：混凝土防渗墙是覆盖层上土石坝坝基关键防渗结构,坝基防渗墙失效使得大坝不能正常运行,甚至导致灾难发生。为此,建立了有限元—比例边界元耦合的深厚覆盖层上土石坝防渗墙的跨尺度精细化分析模型,采用损伤分析和破损后防渗功能目标评价的精细化分析方法,研究了混凝土防渗墙的受力致损机理,量化了对防渗性能的影响。结果表明,基岩支撑作用使防渗墙底部出现近似垂直方向的高压应力;防渗墙与基岩不规则位置相交的局部区域变形受限,可能出现高应力甚至损伤破坏,为薄弱区域;传统方法计算的防渗墙拉应力达11 MPa,远超材料强度,结果失真难以合理评价防渗墙安全性;损伤和渗流分析计算的防渗墙最大拉损伤因子为0.7,坝基渗流量仅增加125 m^(3)/d(9.11%),防渗功能可满足要求。The concrete cut-off wall is the key anti-seepage structure of the earth-rock dam foundation on the overbur-den layer.The failure of the cut-off wall of the dam foundation will lead to the abnormal operation of the dam,and even have disastrous consequences.A cross-scale fine analysis model of earth-rock dam cut-off wall on deep overburden is es-tablished by finite element-proportional boundary element coupling.Through an intricate method for damage analysis and post-damage anti-seepage performance assessment,the study explores the failure mechanisms of the concrete cut-off wall and quantifies their effects on the dam's anti-seepage capabilities.The results show that the bedrock support induces sig-nificant vertical stress concentrations at the bottom of the cut-off wall.Areas of intersection between the cut-off wall and bedrock,particularly at irregular junctures,leads to potential high-stress concentrations or damage,thereby constituting weak areas.The tensile stress of the cut-off wall calculated by the traditional method is 11 MPa,far beyond the strength of the material.The distortion of the results is difficult to evaluate the safety of the cut-off wall reasonably.The maxi-mum tensile damage factor calculated by damage and seepage analysis is 0.7,and the seepage discharge of foundation only increases by 125 m^(3)/d(9.11%).Thus,the anti-seepage function can meet the requirements.

关 键 词：深厚覆盖层 土石坝 防渗墙 损伤分析 防渗性能 

分 类 号：TV641[水利工程—水利水电工程] TV543.82