竖向地震作用对均质黏性土坡稳定性影响的解析法研究

Analytical Study on the Influence of Vertical Seismic Action on the Stability of Homogeneous Cohesive Soil Slope

为同时考虑水平和竖向地震作用,在前人工作的基础上,通过理论分析和公式推导,建立了一个能够考虑竖向地震作用的边坡稳定性解析公式。通过与有限元计算结果的对比,验证了解析公式的有效性。在此基础上,对解析公式进行了计算分析。最后,以一边坡为例,考虑不同地震等级和竖向地震作用,分析不同级别的竖向地震作用对边坡稳定性的影响。研究结果表明:同时考虑水平和竖向地震作用后,土坡安全系数比只考虑水平地震作用时更小,8度区需考虑竖向地震作用影响,9度区必须考虑竖向地震作用影响。

In order to consider both horizontal and vertical seismic actions,based on the previous work,through theoretical analysis and formula derivation,an analytical formula for slope stability considering vertical seismic actions is established in this paper.The validity of the analytical formula is verified by comparing with the results of FEM.On this basis,the analytical formula is calculated and analyzed.Finally,taking the side slope as an example,considering the different earthquake levels and vertical earthquake actions,the influence of different levels of vertical earthquake actions on the slope stability is analyzed.The results show that after considering both horizontal and vertical earthquake actions at the same time,the safety factor of soil slope is smaller than only considering the horizontal earthquake actions.The vertical earthquake actions should be considered in the Ⅷ degree area,and must be considered in the Ⅸ degree area.