金塘大桥桥墩冲刷现状分析

金塘大桥设计阶段采用当时工程海域的地形和潮流状况进行相关计算研究。近些年金塘大桥附近海域现人类活动增强,局部潮流和泥沙动力条件发生了较大的改变,导致大桥附近部分海域及桥墩附近发生了较大的冲刷,对大桥的安全运行产生影响。大桥投入运营后,金塘大桥公司在2011年、2012年对金塘大桥桥墩及附近海床进行冲刷观测,2013年再继续跟踪观测的基础上对三年来的桥墩及海床冲淤变化情况进行了分析。连续3年跟踪观测与分析表明,桥位断面东侧海床的深槽较为稳定,中通航孔西侧有较大冲刷。目前金塘大桥各墩的冲刷坑高程均高于设计冲刷高程值,但部分桥墩富余冲刷深度较小,重点桥段的桥墩需进一步加强观测,需密切关注海床冲刷与局部冲刷的后续发展情况,为大桥的安全运营提供技术支持。

Analysis of Local Scour around Piers of Jintang Bridge

The topographies data and the tidal current conditions that were measured at the same time were used in the design stage of Jintang Bridge. However,the local tidal current and water- sediment conditions are significantly affected by human activity around the bridge and endanger the safety of the bridge,recently. A tracking observation and analysis project was carried out by the bridge management department in 2013,basing on observation data of pier scour and tidal current of the bridge in 2011 and 2012. The results of the project indicate that the scour depth of most piers of the bridge is in the safe range except several piers. These piers should be monitored further and the development of the local scour around the piers should be focused on. This study gives supports to the managements and safety operation of the bridge.