嫩江大桥动床河工模型试验研究

Test study on river models with moveable bed material for Nenjiang Bridge

绥满高速公路齐甘段,主线嫩江大桥桥址所处河段,多为三汊、四汊河道,属汊网型河道。为了对桥孔布置、新疏浚河道位置进行方案比选,判断在修建大桥后桥址处的河道稳定性及河势变化,需开展动床河工模型试验进行模拟。通过动床试验研究,将方案2作为推荐桥位方案,在该桥位处,建桥后桥址区的河道基本保持稳定,在新疏浚河道河底及两岸均需要进行防护,以保证汊道不发育,确保主槽的稳定。另外,为防止新疏浚河道水流顶冲明月岛的右侧岛头,该处需进行防护。

The Nenjiang bridge is the main line of the Qiqihar City to Gannan County section of Suifenhe City to Manzhouli City highway.The bridge site is located in the branching river,the most are three branches or four branches.In order to compare and select the schemes of bridge hole layout and the new dredged river location and judge the river channel stability and the river regime change at the bridge site after the bridge construction,the river models with moveable bed material is need to simulate.Through the test study,the scheme 2 is selected as the recommended bridge location scheme.In the bridge site,the channel maintains stability basically and the river bed and both sides of the bank of the new dredged river should be protected to control the development of the branching river and maintain the stability of the main river.In addition,the right side of the Mingyue island should be protected to prevent the flow erosion of the new dredged river.