200m级面板堆石坝面板脱空影响因素分析

Study of Influence on Separation Between Concrete Slab and Cushion Layer in 200m Concrete Faced Rock-fill Dam

目前针对200m级高面板堆石坝面板脱空机理的研究较少,而国内已建的部分高面板堆石坝均出现不同程度的面板脱空现象。为研究面板脱空影响因素,利用三维非线性有限元对高面板堆石坝进行全方位结构计算,从力学机理上对面板脱空的主要影响因子(堆石流变、施工分期和筑坝材料等)进行深入分析。结果表明,200m级高面板堆石坝面板脱空受多种因素的相互影响,堆石体流变使面板脱空趋势变大,抗剪强度高的堆石体可减小面板脱空范围,优化施工顺序对控制面板脱空有利。

At present there is little research about separation between concrete slab and cushion layer of 200m-level high faced rock-fill dam,and some domestic completed high faced rock-fill dams appear this phenomenon to a great extent.In order to study the influencing factors of separation between concrete slab and cushion layer,the creep deformation and construction sequence were studied by using three-dimensional non-linear finite element.Analysis results show that the separation between concrete slab and cushion layer of 200m-level high faced rockfill dam is affected by the interaction of many factors;the creep deformation of rockfill increases the trend and higher shear strength of rockfill can reduce the range of panel slab separation;reasonable construction order can control the separation of panel slab.