长管袋沉降过程的分析与模拟

根据充沙长管袋的几何，材料特性，分析了管袋沉降机理与沉降速度，导出了管袋位移与转角的计算公式，根据柔性连接体的假设，分析认为管袋沉降速度与管袋几何特性，充填度以及河流的流速与含沙量有关，管袋 在沉降过程中同时受到水流冲击与重力作用，对黄河下游中常洪水，采用直径0．8米，长15米的管袋，其沉降位移可控制在2－4米。

Analysis and Simulation of Long Tube Bag Sinking Movement

The sinking mechanism and sinking speed of long tube bags with full sand are analyzed based on the geometric characteristics and material feature, and formulas for the bag angle and location change calculation are obtained. According to the assumption of flexible connection among the bags, the analysis shows that the bag's sinking speed is related to the geometric characteristics, filling condition, as well as the flow velocity and sediment concentration of the river. The tube bag is influenced by forces of flow and gravity in sinking process. As to the normal and middle floods in the Yellow River, the location change can be controlled within 2 to 4 meters for the bags with diameter of 0.8 meter and length of 15 meters.