桩群密度对丁坝局部冲刷影响的试验研究  

Test Study on the Effect of Pile Density on Local Scour of Spur Dam

作　　者：刘恒博 LIU Hengbo(Xinjiang Tarim River Basin Authority, Korla 841000,China)

机构地区：[1]新疆维吾尔自治区塔里木河流域干流管理局,新疆库尔勒841000

出　　处：《西北水电》2022年第3期87-91,共5页Northwest Hydropower

摘　　要：传统丁坝在河道整治工程中起着顺导水流等作用,但在实践中发现,单一丁坝往往会引起较严重局部冲刷。为了研究丁坝附近的水流结构和河床变形,减少常规丁坝附近的局部冲刷,通过开展5组丁坝结构的对比试验,结果表明,传统丁坝模型的切应力梯度大于群桩模型,能产生更大的侵蚀。通过改变桩群密度,可以减少丁坝场的河床侵蚀,促进丁坝场的沉积,可为河道治理提供支撑。Traditional spur dams guide water flow in river regulation projects.However,it is found in practice that a single spur dam often causes serious local scour problem.To study the flow structure and river bed deformation near spur dams and alleviate local scour near conventional spur dams,five groups of spur dam structures are compared and tested,the test results show that the shear stress gradient of the traditional spur dam model is larger than that of the pile group model,which causes greater erosion.By changing the density of the pile group,the erosion of the riverbed at the spur dam area can be alleviated and the deposition can be increased which provides basis for the river regulation.

关 键 词：丁坝 桩群 动床 局部冲刷 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]