The stability of the anchorage slope on the Baiyang Yangtze River Highway Bridge in Yichang, China, was investigated under different rainfall conditions using model test, numerical simulation, and factor analysis. The results of the study are as follows: (1) with the increase of rainfall intensity, the change of earth pressure can be divided into three stages. However, when the rainfall intensity was larger than a certain value, the change of earth pressure of cut slope became two stages; with the increase of rainfall intensity, pore water pressure increased with the increase of rainfall time, while at a certain stage after the rainfall, the pore water pressure in the cut slope did not decrease immediately, but increased for a period of time. (2) When the rainfall stopped, the stability coefficient of the anchorage slope continued to decrease, then slowly increased, and finally tended to be gentle. Meanwhile, when the rainstorm reached a certain intensity, the main factor that restricted the rainfall infiltration rate became the geotechnical permeability coefficient of the cut slope, which was no longer the rainfall intensity. (3) Factor analysis shows that the rainfall intensity and rainfall duration were the most important factors for anchorage slope stability, while earth pressure, pore water pressure and slope displacement were much less significant.

通过模型试验，数值模拟和因子分析，研究了宜昌市白杨长江公路大桥锚固边坡在不同降雨条件下的稳定性。研究结果如下：（1）随着降雨强度的增加，土压力的变化可分为三个阶段。但是，当降雨强度大于一定值时，挖坡的土压力变化变为两个阶段。随着降雨强度的增加，孔隙水压力随降雨时间的增加而增加，而在降雨后的某个阶段，切坡的孔隙水压力并没有立即下降，而是持续了一段时间。（2）降雨停止后，锚固边坡的稳定系数继续降低，然后慢慢增加，最后趋于温柔。同时，当暴雨达到一定强度时，限制降雨入渗率的主要因素成为挖坡的岩土渗透系数，不再是降雨强度。（3）因子分析表明，降雨强度和降雨持续时间是影响锚固边坡稳定的最重要因素，而土压力，孔隙水压力和边坡位移的影响较小。