Experimental Study on Scour of Pile Column in Layered Riverbed
The sediment in the riverbed of the tidal estuary was stratified by the deposition of different ages,which has a great influence on the results of local scour simulation of riverbed structures under extreme dynamic action.Based on the natural riverbed in the upper reaches of Qiantang River,the local scour of pile foundation was studied by normal flume model test under different representative layered riverbed conditions.The evelopment process of local scour and the mixing characteristics of surface and bottom sand under the two layered structures of upper sand relatively easy or difficult to scour were explored.The variation law of local scour depth of pile foundation with the thickness of upper sand was re-vealed.The theoretical calculation method of scour depth under the condition of layered sand was constructed by dimen-sional analysis.It was verified that the formula is suitable for natural channel scour and model scour,and can be applied to the calculation of pile foundation scour in layered riverbed.
万方数据
维普
