强潮河口排桩式丁坝局部冲刷试验研究

Test Study on Local Scour around Low Sheet-pile Groins at Strong-tide River Mouth

通过对强涌潮作用下单排及双排桩式丁坝局部冲刷的试验研究及钱塘江河口直立式丁坝局部冲刷的调查分析 ,认为在以粉沙土为基础的强潮河口利用抛石护桩可大大地缩短板桩的长度及减小截面尺寸 ,从而达到减少投资和增强排桩式丁坝自身稳定性的目的。通过试验 ,得到了强潮河口排桩式单、双排桩丁坝在块石防护下不同部位的局部冲刷特征。此外 ,半圆形透水坝头可使坝头冲刷坑深度提高 0 5～ 1 0m。

From test study on local scour around single and double sheetpile groins due to strong bore and analysis to that around vertical groin at Qiantang River Mouth,it's considered that the length and cross-sectional area of sheet-pile can be reduced greatly by using riprap for protection,and therefore,the cost will be reduced and the groin stability raised.And also,scour patterns of different parts around the groins under the protection of riprap are obtained from the test.In addition,scour depth around the semi circular permeable groin head will decrease by 0.5～1.0 m.