本文从实验上和理论上对上部有无细砂层的垂向砂柱的排水过程进行了研究，以研究空气对多孔介质排水过程的影响。
The unsteady-state drainage of water from a vertical sand column with and without a finer layer on the top was studied theoretically and experimentally to investigate the air flow generated by the finer layer .
垂柱