强潮地区桥墩局部冲刷模型验证方法研究——以杭州湾跨海大桥桥墩局部冲刷研究为例

Study on the method to validate the pier local scour model in the strong tide region:A case study of the piers local scour of Hangzhou Bay sea-crossing bridge

从建立强潮地区桥墩局部冲刷模型的重要性出发,简要介绍了通过水槽试验所建立的杭州湾跨海大桥局部冲刷模型.强潮特性使得杭州湾跨海大桥桥墩局部冲刷的实际数据获取难度较大,据此提出了基于海底声学探测技术的数据获取方案,即利用多波束测深技术进行桥墩局部海床高程测量、利用多普勒声学测量技术进行潮流测量等,同时结合底质钻孔取样进行底质分析.在介绍了实测数据的处理方法后,结合桥墩设计资料进行了模型参数的计算及模型验证,并根据桥墩实际情况对验证结果进行了相关分析,最后肯定了本方案对于强潮地区进行桥墩局部冲刷观测的适用性.

Starting with the importance of setting up pier local scour model for the bridge in the strong tide region, the pier local scour model of Hangzhou Bay sea-crossing bridge built on the flume experiments is introduced. The strong tide in Hangzhou Bay estuary makes it very difficult to obtain the real data of Hangzhou Bay sea-crossing bridge. So a data acquisition approach based on the submarine acoustic exploration technologies is presented, which uses multi- beam bathymetric technology for the pier local seafloor elevation measurement and Doppler acoustic measurement technology for the current observation, and the sediment analysis of the seabed coring is concomitant. After introdu- cing the correlative data processing methods, the model parameters calculation and verification are fulfilled with the bridge design parameters, and then a correlative analysis is made for the verification results with the actual situation of the piers. In the end the applicability of the approach to the pier local scour inspection in the strong tide region is affirmed.