Rainfall seepage changes the mechanical properties of loess masses. Considering fluid-solid coupling, the calculation model of a loess tunnel is established according to the finite element method (FEM). Based on porous media seepage theory and rainfall infiltration depth theory and considering the infiltrated depth of the loess surface for different rainfall intensities over a certain period, the stability of a loess tunnel under different rainfall amounts and loess cover thicknesses is studied using the dynamic finite element static strength reduction method. The results show that under the same rainfall intensity, the safety factor increases with the depth of the tunnel; the safety factor of the loess tunnel with the same loess cover thickness decreases with increasing infiltration depth. The plastic strain is mainly distributed on both sides of the vault and the arch feet. The stability of the loess tunnel is directly related to the loess cover thickness and rainfall seepage.

中文翻译：

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黄土隧道降雨渗流的地震稳定性

降雨渗流改变了黄土块体的机械性能。考虑到流固耦合，根据有限元法建立了黄土隧道的计算模型。基于多孔介质渗流理论和降雨入渗深度理论，考虑一定时期内不同降雨强度下黄土面的入渗深度，运用动力有限元研究了不同降雨量和黄土覆盖厚度下黄土隧道的稳定性。静态强度降低法。结果表明，在相同降雨强度下，安全系数随隧洞深度的增加而增大。黄土覆盖层厚度相同的黄土隧道的安全系数随入渗深度的增加而减小。塑性应变主要分布在拱顶和足弓的两侧。黄土隧道的稳定性与黄土覆盖层厚度和降雨渗流直接相关。