劈裂灌浆对土石坝应力应变和稳定的影响

Effect of split-grouting on earth-rock dam stress-strain and stability

土坝劈裂灌浆对坝体的应力、应变、稳定的影响很大。采用Duncan-Chang非线性模型,模拟了某土石坝劈裂灌浆的灌浆-停灌施工过程,进行了应力、应变、稳定有限元分析。劈裂灌浆可以同时增大大小主应力,在灌浆轴线附近区域,小主应力增加幅度大于大主应力增加幅度,应力水平较灌浆前降低,土坝稳定性增加。与原型观测资料进行对比分析,表明计算结果与实测资料基本吻合。

Split-grouting has great effect on stress, strain and stability on earth-rock dam. By using Duncan-Chang E-B model, the grouting period-stopping period of a earth rock dam, and the finite element analysis of stress and strain. Split-grouting can increase the maximum and minor principal stresses at the same time. In the neighborhood area of grouting axes, the minor principal stress increased more extent than the maximum one. The stress level was reduced and lower than before; and the stability of the earth dam increased. Comparing with the observation data, the result is in accordance with the measurment.