The effect of the drain hole on drainage and seepage pressure lowering is quantitatively studied with an engineering example.
定量地研究了排水孔孔径、孔深等因素对降低坝基渗透压力和排除坝基渗透水流的作用。
2
The enlargement of hole diameter increased the exposed area and pressure releasing range of bored coal seam, and raised gas drainage amount and discharging effect from holes.
In order to explore the effect of ambient pressure on jet flow field in deep well and ultra-deep well, a physical model for flow field of confined water jet at bottom hole was established.