带混凝土防渗墙土石坝的应力应变分析

在透水的深覆盖层上建造土石坝,常采用就地灌注的混凝土防渗墙来截断坝基渗流。由于刚性的混凝土墙夹在较柔性的砂砾坝基中,致使合理地确定混凝上防渗墙上的应力成为一个难题。本文提出坝体及坝基用非线性土体单元、混凝土防渗墙用线性梁单元、墙与两侧的砂砾之间用摩擦接触单元等三种单元组成的非线性有限元法,分析了大渡河铜街子左深槽堆石坝的应力应变,论证了坝基深槽中的两条混凝土防渗墙都是偏心爱压构件,求得的应力能力一般混凝土所承受。

Stress-Strain Analysis of Earth-rockfill Dams with Concrete Cut-off Walls

It is possible to build an earth-rockfill dam on almost any kind of foundations.For deep and pervious soil foundations,a concrete cut-off wall must be provided to eliminate the danger of piping.The stress of the earth-rockfill dam with a concrete cut-off wall is analysed with FEM,in which three kinds of elements have been used.The nonliear soil element is used to model the dam and foundation,the beam element is used to model the wall,and the friction contact elements are installed between the wall and soil.Tong-jie-zi Rockfill Dam on the Dadu River has been analysed.It has been proved that the concrete cut-off wall bearing vertical compression and moment is an eccentrically compressed member,and the stress in the cut-off wall can be beared by common concrete.