Abstract: In order to study the seepage and stability of unsaturated complex soil reservoir bank slope under the combined action of rainfall and reservoir water level fluctuation, a calculation model of sand bearing slope was established based on ABAQUS software. Under the conditions of rainfall intensity of 48.0, 72.0 and 100.8 mm/d and reservoir water level fluctuation rate of 0.5, 1.0 and 1.5 m/d, the seepage field characteristics and stability of reservoir bank slope were analyzed. The results show that under the influence of single factor, the greater the rainfall intensity or the water level falling rate, the worse the stability of the reservoir bank slope. Under coupling action of rainfall and water storage (rise of reservoir water level), rainfall intensity and water storage have relatively little impact on the stability of reservoir bank slope. Under coupling action of rainfall and reservoir water level drop, the water level drop is the dominant factor causing the rapid decline of reservoir bank slope stability, and the reservoir bank slope stability decreases with the increase of rainfall intensity. The effect of seepage force promotes the connection of the plastic zone of the sand bearing slope and greatly weakens the stability of the reservoir bank slope.

Key words: port and waterway engineering; sand-bearing slope; seepage field; stability analysis; unsaturated soil

摘要： 为了研究降雨与库水位涨落2种因素耦合作用下非饱和复杂土质库岸边坡的渗流与稳定性问题，基于ABAQUS软件建立了含砂层边坡计算模型；研究了在降雨强度分别为48.0、72.0、100.8 mm/d，库水位升/降速率分别为0.5、1.0、1.5 m/d条件下，库岸边坡的渗流场特性和稳定性。结果表明：单因素影响下，降雨强度越大或水位下降速率越大，库岸边坡稳定性越差；降雨与蓄水（库水位上升）耦合作用下，降雨强度及蓄水对库岸边坡稳定性的影响相对较小；降雨与库水位下降耦合作用下，水位下降是引起库岸边坡稳定性快速下降的主导因素，且库岸边坡稳定性随着降雨强度的增大而降低；渗透力的作用促进了含砂层边坡坡体塑性区的贯通，极大地削弱了库岸边坡稳定性。

关键词: 港口航道工程；含砂层边坡；渗流场；稳定性分析；非饱和土