摘要
局部冲刷减小桥墩或桥台的埋深而威胁桥梁的安全。本研究建立了三种工况,初步研究框架结构及其两种不同安装模式下的地减轻圆柱体周围的局部冲刷情况。在试验中,将混凝土圆柱体置于透明玻璃板上的薄层石英砂床中,并在玻璃板下设置摄像机,以记录局部冲刷面积的变化。这一可视化方法可以直观记录泥沙的局部冲刷范围变化,进而更好地理解水流局部冲刷作用下桥墩周围泥沙的运动。试验中测量了圆柱体或框架结构周围的流速场,并记录了0.288 m/s的流速下各工况的冲刷过程。结果表明,该框架结构能有效地防止减小局部冲刷,有利于圆柱体后泥沙的存留。
Local scour threatens the safety of bridges by reducing the burial depth of piers or abutments. In this study, experiments of three cases were set up to study how effectively two types of frame structures mitigate local scour around the cylinder. In the established experiments of four cases, a concrete cylinder was placed in a thin sand bed on a transparent glass plate, and a camera was set under the glass plate to record the change of local scour area, which is a visual recording way of the process and enables better understanding of the movements of the sand. Flow velocity fields around the cylinder or frame structure were measured and scouring processes were recorded with 0.288 m/s flow velocity. The results showed that the frame structure mitigates local scour and helps to maintain the sand behind the cylinder.
作者
金鹏
谢立全
李煌
Peng Jin;Liquan Xie;Huang Li(College of Civil Engineering, Tongji University, Shanghai)
出处
《土木工程》
2019年第1期63-69,共7页
Hans Journal of Civil Engineering
基金
国家自然科学基金委员会面上项目(编号11172213和51479137)资助.
