地下水作用是岸坡稳定性的重要影响因素，在航道岸坡整治工程中，岸坡排水设施必不可少。水平排水孔可以有效排出岸坡土体内部地下水，降低地下水水位。通过三维非稳定渗流数值模拟，分析了岸坡水平排水孔的排水效果。首先，对排水孔室内模型试验进行了数值模拟，结果表明数值模拟结果与试验结果较为一致，坡体中地下水向水平排水孔汇集并排出坡体;之后，对典型岸坡渗流场进行了数值模拟，其结果表明，水平排水孔的排水效果较为明显，可以加深对于渗流场的控制范围，孔深越大，排水效果越好。研究成果可为水平排水孔在航道整治工程的应用提供参考。

Groundwater is an important influential factor of bank slope stability, and drainage facility for bank slope is necessary in waterway regulation project. Horizontal drainage holes could effectively reduce groundwater level by draining away the water of deep soils. The drainage effect of horizontal drainage holes in bank slope is studied by means of three-dimensional transient seepage numerical simulation. The numerical result agrees with indoor model test result. The groundwater of slope converges to horizontal drain and drains away from slope. Simulation of characteristic real bank slope shows that the drainage effect of horizontal drain for bank slope is apparent, and the control region of seepage field is enlarged. The deeper the drainage hole is, the better the drainage effect is. The research results could provide references for the application of horizontal drainage holes in waterway regulation engineering.