防渗墙钻孔压水原位渗流检测方法由于施工简单、成本低、时间短、对堤坝没有损伤，是一种值得推荐的堤坝防渗墙现场检测方法，但目前尚无相应的渗透系数计算公式。通过饱和非饱和三维渗流计算并分析防渗墙钻孔压水试验中渗流分布特性，推导出防渗墙钻孔压水试验的渗透系数近似计算公式，为堤坝防渗墙施工质量的快速检测工作提供一定的技术支持。

Because of the easily construction, the lower cost, the shorter construction time and less damage to the dike，the seepage measure method in the site pressurized-water test of cut-off wall is a kind of recommended examination method. But it is not popular because of the lack of suitable calculation formula of seepage coefficient. A seepage coefficient approximate calculation formula of pressurized-water test in drilling is derived by analyses of seepage distribution characters and the saturated and non-saturated three dimensional seepage computations in this paper. The result provides a certain technical support for fast examination work of the dike cut-off wall construction quality.