施工期临时断面挡水渡汛对于面板坝坝坡稳定的影响研究

面板堆石坝施工期采用临时断面挡水度汛方案时,由于临时断面上游尚未施工混凝土面板,因此临时断面的大部分区域及坝基材料将处于饱和状态,这种状态有可能对大坝竣工期的坝坡稳定产生某种影响。为研究临时断面挡水度汛对于大坝竣工期坝坡稳定的影响,本文结合一工程实例,首先采用有限元法进行了临时断面挡水度汛情况下的渗流分析,然后采用非线性有限元法对临时断面是否挡水度汛两种情况下大坝竣工期的坝坡稳定性进行了比较研究。结果表明:采用临时断面挡水度汛施工方案对于大坝竣工期上游坝坡抗滑稳定的影响要大于对于下游坝坡的影响,但其影响是有限的。

Study on the influence of temporary section of retaining dike for flood protection on the dam slope stability of CFRD during construction period

When using the temporary section of retaining dike for flood protection during the face rockfill dam construction,lacking of concrete panel construction in upstream will lead to a saturation state of most area on temporary section and dam foundation material,which would affect the stability of dam slope when the dam is completed.To study the effect of temporary section of retainins dike for flood protection on stability of CFRD,combining with the Hongjiadu concrete face rock-fill dam project,the paper analyzed the seepage under temporary section of retaining dike for flood protection by finite element method,and studied the dam slope stability in the two situations that whether temporary section retains flood or not by using nonlinear finite element method.The result showed that the impact of using temporary section for flood protection on the upstream dam slope stability against sliding will be more than the impact of that on downstream dam slope,while the impact was limited.