桩式丁坝在山区中小河流治理中的适用性探讨

Discussion of application of sheet-pile groins in regulation of small and medium-sized rivers

基于调研和室内试验,研究水流经过桩式丁坝后的流态及其冲淤特性,并考虑中小河流治理中对整治建筑物的要求,分析了桩式丁坝的适用性。研究认为:由于坝身具有透水性,对主流及行洪影响较小,抗冲性较好;坝后水流平缓,淤积程度亦较小,有利于水生动物生长繁殖;可通过灵活调节透水率达到不同的治理目标;筑坝材料可就地取材,降低造价。桩式丁坝在中小河流治理中有着较好的适用性,可满足防洪、生态、环境、节约等综合治理要求,具有良好的应用前景。

Based on the investigation and laboratory experiment,the flow structure and properties of erosion and deposition of sheet-pile groins are researched.According to the demands of engineering structure in regulation of small and medium-sized rivers,the potential applicability of sheet-pile groins is analyzed.The results show that,as a permeable structure,the influence of the structure on main flow and flood level is less than that of the solid one,and the local scour depth is smaller.A slow flow field is formed behind the sheet-pile groins with smaller deposition volume,which is favorable for the propagation of small aquatic animal.The pervious rate can be adjusted according to different regulation goals.And the dike material is not limited,which is convenient for the use of local materials and can reduce the construction cost.The sheet-pile groins have a good applicability in the regulation of small and medium-sized rivers,which can meet the requirements of flood control,ecology,environment,cost saving and so on.