The conclusion is educed that there is a reasonable depth when drainage is set and the effect of drainage diameter and drainage space on seepage discharge and uplift of dam foundation is studied.

• 只有主排水作用时,得到了排水孔作用效果的决定因素,得出了排水孔的设置也应有一个合理深度的结论,还分析了排水孔孔径、间距对渗流量和扬压力的影响。