Plastic vertical drains is a vertical channel of water discharge in drainage consolidation foundation treatment. Significant settlements happens as foundation treatment process, while plastic verti-cal drains bending. Thus it need to be validated that the flow capacity decrease, which leads to affecting reinforcement effect. This paper studies the four types of representative of plastic vertical drains. Through fixed iron frame model, manual bending plastic vertical drains to simple simulate the bending defor-mation. The relationship between the bending angle and the local loss coefficient is quantitatively ana-lyzed. The fitting formula between the local loss coefficient and the flow capacity reduction coefficient is obtained. The method of calculating the reduction coefficient through bending rate is compared and ana-lyzed.
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