临时断面挡水度汛对面板堆石坝应力变形的影响分析

Analysis of influnce of Temporary section retaining water on stress deformation of CFRD

基于非线性邓肯E-B模型,以洪家渡面板堆石坝工程为例,建立有限元计算模型。运用中点增量法,针对施工期利用临时断面挡水和不挡水两种工况,实际模拟坝体的施工填筑过程及其临时断面的挡水度汛过程,通过对两种工况下大坝竣工期应力变形的计算与比较,探讨了临时断面挡水度汛对于大坝应力变形的影响机理。结果表明:临时断面挡水度汛对于大坝竣工期应力变形的影响是有限的,采用临时断面挡水度汛施工方案是可行的。

Taking the project of Hongjiadu CFRD as an example,on the base of nonlinear DFuncan-chang E-B model,the paper established the finite element model.By using midpoint incremental method,aim at the two conditions of whether to use temporary section retaining water in construction period,discussed the temporary section retaining water for dam deformation and stress influence under the conditions of dam completion period stress deformation and stress influence under the conditions of dam completion period stress deformation calculation and comparison.Results showed than the influence of the mporary section retaining water dam deformation and stress of completion period is limited,using provisional cross-section retaining water flood construction scheme is feasible.