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利用平面有限元对某深厚覆盖层上的高土石坝防渗墙进行应力分析,研究防渗墙混凝土采用线弹性本构模型和非线性弹性本构模型时计算的应力差异,并对比了相同防渗墙高度不同坝高和同一坝高不同防渗墙高度下2种模型对防渗墙应力的影响。分析表明,2种本构模型计算的防渗墙应力变化规律相同,但弹性非线性模型计算的应力比线弹性模型计算结果小。在低应力情况下两者计算值接近,在高应力情况下两者计算值差异较大。防渗墙最大应力随坝高和防渗墙高度的增加而增大,2种模型计算的最大应力的相对误差也随着坝高和防渗墙高度增加而显著增大,且呈线性增大趋势。对坝高或覆盖层厚度较大的情况,防渗墙应力较大,宜采用非线性模型进行计算。
The stress analysis of the cut-off wall of a high earth-rock dam on a deep overburden is carried out by using the plane finite element method to study the stress differences calculated by using the linear elastic constitutive model and the nonlinear elastic constitutive model of the impervious concrete wall. Influence of two kinds of models on seepage prevention wall under different height of seepage wall and height of different seepage prevention wall with the same dam height. The analysis shows that the stress variation of impervious wall calculated by the two constitutive models is the same, but the calculated stress of elastic nonlinear model is smaller than the linear elastic model. In the case of low stress the calculated values are close, in the case of high stress the calculated difference between the two larger. The maximum stress of the cutoff wall increases with the height of the dam and the height of the cutoff wall. The relative errors of the maximum stress calculated by the two models also increase significantly with the increase of the height of the dam and the cutoff wall, and increase linearly trend. For dam height or overburden thickness larger, cut-off wall stress larger, should be calculated using a non-linear model.