To verify the washing effectiveness, the perforated area was then washed a second time, now from bottom to top, and at a much lower pressure.
为了核实清洗效果，可以采用更低的压力对射孔段进行由底向顶的重复冲洗。
2
The uplift force on bottom and the total vertical force of regular waves acting on perforated caisson are systematically investigated by experiments in this study.