摘要
混凝土面板和接缝止水是面板堆石坝坝体主要防渗结构,面板开裂或止水失效会显著影响裂缝或失效部位局部范围渗流场分布,影响大坝正常服役性能。为探究面板局部开裂和止水结构失效引起的渗流安全问题,设计不同面板开裂和止水失效位置,建立铅山抽蓄电站混凝土面板坝三维渗流有限元分析模型,研究其渗流位势分布、渗透坡降和渗透流量演化规律,探明面板开裂和止水失效的影响,并开展临时度汛条件下垫层料渗透系数敏感特性分析。结果表明:随着面板止水结构失效、开裂位置降低,通过面板渗透流量增大。临时度汛条件下,随垫层渗透系数增大,垫层最大平均渗透坡降减小。垫层渗透系数从1.0×10^(-5)m/s增大至5.0×10^(-5)m/s时,垫层最大平均渗透坡降减小了1.94。建议垫层渗透系数宜大于5.0×10^(-5)m/s,可提高临时度汛条件下垫层渗透稳定安全。研究成果可为类似抽蓄电站面板堆石坝防渗体系设计和施工提供理论依据。
Concrete slabs and water stop joints are the main seepage control structures of the slab rockfill dams.Slab cracking or water stop failure will significantly affect the distribution of seepage fields in the local area of the cracks or the failure site,which will threaten the normal service performance of the dam.To investigate the seepage safety problems caused by local slab cracking and failure of water stop structures,different positions of slab cracking and water stop failure were designed,and a three-dimensional seepage finite element analysis model of the concrete slab dam of Yanshan pumping and storage power station was established.The evolution law of seepage potential distribution,seepage gradient,and seepage flow rate was studied.The effects of slab cracking and water stop failure were explored,and the sensitivity of the cushion material's permeability coefficient under temporary flood conditions was analyzed.The results show that the seepage flow rate through the slab increases as the water stop structure fails,and the cracking position decreases.Under temporary flood conditions,the maximum average seepage gradient of the cushion decreases with the increase in permeability coefficient.When the permeability coefficient of the cushion increases from 1.0×10^(-5)m/s to 5.0×10^(-5)m/s,the maximum average seepage gradient of the cushion decreases by 1.94.It is suggested that the permeability coefficient of the cushion should be greater than 5.0×10^(-5)m/s,which can improve the stability and safety of cushion seepage under temporary flood conditions.The research results can provide a theoretical basis for the design and construction of a slab rockfill dam anti-seepage system of similar pumping and storage power stations.
作者
岳潇
陈德文
黄馨怡
甘磊
沈振中
YUE Xiao;CHEN Dewen;HUANG Xinyi;GAN Lei;SHEN Zhenzhong(Shandong Electric Power Engineering Consulting Institute Co.,Ltd,Ji'nan 250013,China;College of Water Conservancy&Hydropower Engineering,Hohai University,Nanjing 210024,China)
出处
《人民珠江》
2025年第3期39-45,共7页
Pearl River
基金
国家自然科学基金项目(52179130)
山东电力工程咨询院有限公司咨询项目(37-2023-21-K0030)。
关键词
混凝土面板坝
面板失效
临时度汛
渗流分析
铅山抽蓄电站
concrete slab dam
slab failure
temporary flood
seepage analysis
Yanshan pumping and storage power station
