摘要
文章以港珠澳跨海大桥工程为依托,采用理论计算和模型试验的手段进行研究,在公式得到验证的基础上,针对往复流不同入射角条件下桥墩局部冲刷深度问题进行探讨。结果表明:潮汐往复流条件下,桥墩上下游均出现局部冲刷,且上游冲刷深度大于下游;当桥墩迎流面与往复流流向基本垂直时,桥墩局部冲刷深度理论计算值略大于模型试验值,误差均在10%以内;在顺流面长度大于迎流面宽度的矩形桩墩墩型条件不变时,桥墩局部冲刷深度随往复流来流入射角的增大以变速率增大,且当入射角大于一定值时,桥墩冲刷深度趋于稳定。
Based on the Qingzhou waterway main bridge piers of Hong Kong-Zhuhai-Macao Bridge, theoretical calculation and model tests were studied for the reciprocating flow with different incident angles between piers local scour depth on the basis of verified formulas. The results indicate that： local scour occurs at both upstream and downstream piers under reciprocating tidal flow, and scouring depth at downstream is greater. When the incident flow surface is perpendicular to the flow direction of reciprocating flow, the pier local scour depth from the theoreti- cal values is slightly greater than model test values, and errors are no more than 10%. When the rectangle pier-type condition is fixed from which the length of downstream face is greater than the width of incident flow surface, piers local scour depth under reciprocating flow increases with variable rate while the angle of incidence increases. Once the angle of incidence is bigger than a fixed value, the local scour depth generally tends to be stable.
出处
《水道港口》
2014年第2期112-117,共6页
Journal of Waterway and Harbor
关键词
跨海大桥
局部冲刷
往复流
入射角
cross-sea bridge
local scour
reciprocating flow
angle of incidence
