河道岩基陡坡围堰设计研究

Study on Design of Cofferdam on Rock Foundation Steep Slope of River

在河道岩基陡坡上开挖基坑,临水面面临河水倒灌问题,需在基坑外侧填筑围堰。岩基陡坡上围堰工程不仅自身稳定性差,且需要评估对于河道行洪与通航的影响。以南宁市324国道改扩建工程(金陵大桥)为例,介绍了岩基陡坡围堰设计的难点,针对制约条件提出设计方案并验证其安全稳定性,为类似工程提供借鉴。

The surface of the water will face the problem of river flood when a foundation pit is excavated on the rock foundation steep slope of river.It is necessary to fill the cofferdam outside the foundation pit.The cofferdam project on the steep slope of the rock foundation is not only difficult to meet its own requirements due to its poor stability,but also needs to be evaluated for the impact on the river flooding and navigation.Taking Nanning 324 National Highway Reconstruction and Expansion Project(Jinling Bridge)as an example,the difficulties in the design of rock foundation steep slope cofferdam are introduced.The design scheme is proposed in allusion to the constraints,and its safety and stability are verified,which provide a reference for similar projects.