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在分析坝体沿倾向下游的软弱夹层滑动的稳定性时,目前仍然广泛应用着“双斜滑动法”.最近,文献[1]对此做了全面介绍,在它的计算模式中假定了一个铅直的破裂滑动面.但是在模型试验中,却发现两个破裂滑动面都是倾斜的.本文提出按三个倾斜面(一个软弱夹层滑动面,两个破裂滑动面)计算抗滑稳定性的方法.算例表明,“双斜滑动”与“三斜滑动”相比,过高地估算了坝体的抗滑稳定安全系数.这一结论似应提请大坝工程设计者注意.本文方法简单,便于设计人员应用.
In the analysis of the stability of the weak intercalation slide along the dam downstream of the dam, the “double-sliding sliding method” is still widely used. Recently, the literature [1] introduced it comprehensively and assumed a The vertical fractured sliding surface. However, in the model test, it was found that the two fractured sliding surfaces are inclined. This paper proposes that the anti-sliding stability is calculated based on three inclined surfaces (one weak sandwich sliding surface and two fractured sliding surfaces). The example shows that the “double-sliding sliding” and the “three-sliding sliding” have overestimated the anti-sliding stability safety coefficient of the dam body. This conclusion seems to be brought to the attention of the dam project designer. The method is simple. For easy application by designers.