防渗墙裂缝对沥青混凝土心墙坝坝基渗流的影响分析  

The Influence of Cracks in Cut-off Wall on the Foundation Seepage of an Asphalt Concrete Core Wall Dam

作　　者：杨云超 YANG Yunchao(Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434

出　　处：《水电与新能源》2023年第11期51-54,共4页Hydropower and New Energy

摘　　要：以某深厚覆盖层沥青混凝土心墙堆石坝为例,通过建立三维有限元模型进行渗流分析,研究其防渗墙裂缝宽度及裂缝型式对坝基渗流场的影响。结果表明,防渗墙完好条件下,坝基渗流量及渗透稳定性满足规范要求;随着防渗墙裂缝宽度以及裂缝条数的增加,大坝防渗截面的总渗流量显著增大,除裂缝外其余部位渗流量均有所减小,坝址下游溢出点土体发生渗透破坏。Taking an asphalt concrete core wall rockfill dam on deep overburden as an example,this paper conducts seepage analysis of the dam by establishing a three-dimensional finite element model to study the influences of the width and pattern of cracks in cut-off wall on the foundation seepage field.The results show that the seepage flow and seepage stability of the dam foundation meet the requirements of the design specifications when the cut-off wall is of no cracks.With the increase of the crack width and the number of cracks in the cut-off wall,the total seepage flow through the impervious section of the dam increases significantly.While the seepage flow in other parts except cracks decreases.The soil mass at the downstream spill point of the dam site is under seepage failure condition.

关 键 词：沥青混凝土心墙堆石坝 三维渗流分析 防渗墙裂缝 渗透破坏 

分 类 号：TV641.4[水利工程—水利水电工程]