环翼式防冲板对圆端形桥墩局部冲刷试验及水力特性

发布时间：2018-07-06 21:34

本文选题：圆端形桥墩 + 环翼式防冲板　；参考：《南水北调与水利科技》2017年05期

【摘要】：由于传统桥墩冲刷防护措施的局限性,引入新型防冲装置-环翼式防冲板,对圆端形桥墩冲刷进行防护,通过减小下降水流改变桥墩周围水流结构,主动降低了下降水流对桥墩的冲刷。为探究环翼式防冲板对圆端形桥墩局部冲刷的防护作用,采用3种比例圆端形桥墩、3种环翼式防冲板安装位置进行物理模型试验,对圆端形桥墩周围的冲坑特征、垂向流速、垂向紊动强度、紊动切应力等水力要素进行研究。结果表明:安装环翼式防冲板后,3种圆端形桥墩冲刷程度均减小,中圆端形桥墩冲刷减小幅度最大,冲坑体积减小率为30.0%;中圆端形桥墩安装环翼式防冲板后,墩前垂向流速减小为0.039m/s、垂向紊动强度减小为0.025m/s;防冲板上垂面紊动切应力增大,板下垂面紊动切应力减小。试验结果表明环翼式防冲板能够减小桥墩的局部冲刷,具有很高的实用价值。
[Abstract]:Because of the limitation of the traditional bridge pier scour protection measures, a new anti-scour device, ring wing anti-scour plate, is introduced to prevent the round end pier from scouring, and to change the flow structure around the pier by reducing the downflow. It actively reduces the erosion of the pier by the descending flow. In order to investigate the protective effect of annular wing anti-scour plate on local scour of round end pier, the physical model test was carried out on three kinds of proportional circular end pier and three kinds of annular wing type anti-scour plate. The characteristics of scour pit around round end pier and vertical velocity were analyzed. Vertical turbulence intensity, turbulent shear stress and other hydraulic factors were studied. The results show that the scour degree of the three kinds of round end pier is reduced after installing the annular wing type anti-scour plate, the scour of the middle round end pier is the biggest, the volume of the scour pit is 30.0.After installing the ring wing type anti-scour plate on the middle round end pier, The vertical velocity in front of the pier decreases to 0.039 m / s, the vertical turbulence intensity decreases to 0.025 m / s, and the turbulent shear stress on the vertical plane increases and the turbulent shear stress on the vertical plane decreases. The experimental results show that the annular wing anti-scour plate can reduce the local scour of the bridge pier and has high practical value.
【作者单位】：内蒙古农业大学水利与土木建筑工程学院;黄河水利委员会黄河水利科学研究院;
【基金】：国家自然科学基金(51369022) 内蒙古自然科学基金(2013MS0719)~~
【分类号】：U442.32

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