深覆盖层上壤土心墙土石混合坝三维有限元应力变形分析

3D FEM analysis of deformation and stress for a high earth-rockfill dam with core wall on deep overburden

在深覆盖层上修建高土石坝,当采用两道混凝土防渗墙时,防渗墙与坝体、坝基的联合作用会使得防渗墙和心墙的应力和变形变得更为复杂。采用稳定渗流有限元分析,确定作用在心墙和防渗墙上的水荷载,建立坝体和坝基的三维有限元模型,采用非线性邓肯-张模型,计算了施工期和运行期坝体应力和变形,分析了深厚覆盖层上采用两道防渗墙的坝体和防渗墙的应力变形特性,评价坝体和混凝土防渗墙的稳定和安全,并提出该类防渗墙的施工建议。

A high rockfill dam on deep overburden needs two concrete cutoff walls,the combined action of the walls with dam body and foundation makes stress and strain more complex.In this paper,water load action on the wall was determined by FEM analysis of stability seepage.The 3D FEM model was built which included the non-linear Duncan-Chang model for the rockfill material,and the properties of the dam and wall were studied by calculating the stress and strain under different operation conditions.Then the stabili-t...