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沉管管节的浮运阻力对其浮运设计与施工有重要影响。本文通过物理模型试验对管节在不同流速、不同方向和不同吃水组合作用下的阻力与阻力系数进行了研究,以获得沉管在不同水流环境下的阻力特性。研究表明:管节阻力和阻力系数大体随吃水或流速的增加而增大;在相同的流速下,随流向角的增加管节的水流阻力逐渐增大;在流向角为0°和30°下,管节的阻力系数变化不明显,而在流向角60°和90°下,管节的阻力系数增加显著;拟定的三种吃水条件下沉管的浮运阻力差距不明显;在2.0 m/s以上的高流速下,沉管模型容易发生埋首现象。研究成果可为佛山沉管隧道管节的浮运施工提供理论指导。
The sinking resistance of sink pipe joints has an important influence on the design and construction of its floatation. In this paper, the resistance and drag coefficient of pipe joints under different flow rates, different directions and different combinations of draft were studied through physical model test to obtain the resistance characteristics of immersed pipe under different water flow conditions. The results show that the joint resistance and drag coefficient generally increase with the increase of draft or flow rate. At the same flow rate, the flow resistance of the joint increases with the increasing of the flow angle. At flow angles of 0 ° and 30 ° , And the drag coefficient of pipe joints did not change obviously. However, the drag coefficient of pipe joints increased significantly at the flow angles of 60 ° and 90 °. There was no obvious difference in the dragging resistance of the pipe between the three draft conditions; at 2.0 m / s above the high flow rate, immersed tube model prone to buried phenomenon. The results of the research can provide theoretical guidance for the construction of the floating pipe tunnel of Foshan immersed tunnel.