管道穿越富春江分层河床最大冲刷深度试验研究

Experimental Study on the Maximum Scouring Depth of Layered Riverbed at Pipeline Crossing Fuchunjiang River Section

设计水文条件下河床最大冲刷深度是管道等穿越河床工程设计的关键参数,分层河床最大冲刷深度预测尤为困难。采用分层、分粒径组的方法模拟河床分层泥沙,探索分层河床冲刷预测的模拟方法,预测了管道穿越富春江分层河床最大冲刷深度。结果表明,分层河床组合抗冲能力越弱,冲刷深度越大。试验冲刷深度结果合理,可做为工程设计的参考依据。

The maximum scouring depth of riverbed under the design hydrological condition is the key parameter for the pipeline design crossing the riverbed.It is particularly difficult to predict the maximum scouring depth of multilayer riverbed.The simulation method of layered riverbed erosion prediction is explored considering different segments along cross-section and different layers,different grain size groups.The maximum scouring depth of multilayer riverbed for pipeline crossing Fuchunjiang River is predicted.The results show that for multilayer riverbed,the weaker the combining riverbed scour resistance is,the deeper scouring depth is.The test result of the scouring depth is reasonable,and can be used as reference for engineering design.