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杭州湾跨海大桥位处强潮河口海湾,杭州湾口门开阔,水浅潮强,涌潮汹涌。悬沙与床沙粒径差异较小,海床冲淤变幅较大。防止桥墩局部冲刷为桥梁安全运营的关键之一,为此,通过正态水槽动床试验,较好地模拟了杭州湾大桥海中平台及匝道墩桥墩局部冲刷状况,试验研究了它们在一般大潮及50年一遇大潮工况下的局部冲刷深度。同时,由于在不利河势叠加不利水文条件时,部分桥墩的最深冲刷高程将接近甚至超过设计冲刷高程,因此,作为一种应急冲刷防护措施,对抛石防护的效果进行了试验,该应急防护措施能有效减缓桥墩局部冲刷,达到较好的防护效果。
Hangzhou Bay Bridge is located in the strong tidal estuary bay, Hangzhou Bay port open, water and shallow tide, surging tide. The difference of suspended sediment and bed sand particle size is small, and the ebb and flow of the sea bed fluctuates greatly. To prevent local scouring of piers is one of the keys to the safe operation of bridges. For this reason, the normal scouring bed dynamic test is used to simulate the local scour of the Hangzhou Bay Bridge and the ramp pier. The experimental results show that, Local scour depth under a 50-year tide. At the same time, because of the unfavorable hydrological conditions superimposed in the adverse river conditions, the deepest scouring depth of some piers will be close to or even exceed the design scouring level. Therefore, as a measure of emergency scour protection, the effect of riprap protection has been tested. The emergency protection Measures can effectively reduce the local pier scouring to achieve better protection.