牵拉抢险长管袋水下沉落的力学模拟

Mechanics simulation during the settling process of the long bag with drag rope

采用牵拉方法为充泥长管袋沉落定位,达到缓流堵口的目的,是黄河抢险堵口的新技术。本文对牵拉抢险长管袋这种新型的抢险柔性材料进行了抛掷沉降的模拟实验研究,得到了对管袋沉落过程的基本认识,获取了基本力学参数。在此基础上分析了牵拉长管袋沉降的力学特性,建立了牵拉长管袋沉落力学模型。通过不同工况的模拟计算,得到了牵拉绳长、大河流速、大河水深等与牵拉力之间的关系,发现了管袋碰撞着地时牵拉力的突跃现象。本文提出的计算方法及有关参数对完善牵拉长管袋设计,提高新材料抢险堵口技术具有重要的工程指导意义。

The use of the long bag with drag rope to reduce the flow velocity of the breach is a new technique in stopping up the flood breach of the Yellow River. By the model test, the authors analyzed the fundamental mechanics characters of the long flexible bag in the throwing and settling processes and established the mechanics model. Based on this mechanics model, the relations between the drag force and the rope length, the flow velocity, and the flow depth are obtained. Besides, the sudden jump of the drag force of the rope in touching the bed can also be simulated. The proposed model could provide a technical support in the design of the long bag with drag rope.