水下爆破在湘桂铁路柳江双线特大桥的应用

水下爆破是指被爆岩体上部有水介质覆盖的爆破。由于是在水下进行作业，不仅在爆破材料、钻孔技术、爆破参数及爆破冲击渡、地震波传播规律等方面均与在陆地上的爆破有很大的不同，而且水下的作业环境更复杂，安全风险更大。因此，在水下实施爆破对爆破技术的要求高，且施工难度大。文章针对施工实例，介绍了为了使桥墩双壁钢围堰顺利平稳下沉，采用水下爆破进行河床清平的爆破方案设计及施工技术，期望能对类似工程的施工提供借鉴。

The Application of Underwater Explosion to Hunan and Guangxi Railway Liujiang Double Line Bridge

Underwater explosion refers to the blasting of rocks beneath water. Underwater operation is different from groundexplosion not merely in blasting materials, drilling technique, blasting parameters, blasting shock waves, the transmission of blasting seismic wave etc., but more difficult than the latter in its complicate environment, safety, and therefore highly demanding in its technique and construction. Practical construction cases are provided in this paper to introduce the underwater riverbed blasting plan and construction technique to make the double wall steel cofferdam of the bridge pier subside smoothly and steadily, which is expected to provide reference for later similar work.