清水条件下淹没式透水桩群减少圆柱桥墩局部冲刷试验  

Experimental on local scour around cylindrical pier protected by submerged permeable pile group in clear water

作　　者：齐洪亮[1] 袁天刚 陈贵山 田伟平[1] 李家春[1] 李超平 QI Hong-liang;YUAN Tian-gang;CHEN Gui-shan;TIAN Wei-ping;LI Jia-chun;LI Chao-ping(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang’an University,Xi’an 710064,Shaanxi,China;Bureau of Xi’an Highway,Xi’an 710003,Shaanxi,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]西安市公路局,陕西西安710003

出　　处：《长安大学学报（自然科学版）》2023年第2期69-79,共11页Journal of Chang’an University(Natural Science Edition)

基　　金：国家重点研发计划项目(2022YFC3002600);在役干线公路基础设施与安全应急数字化试点项目(303);国家自然科学基金项目(51708043);陕西省自然科学基础研究计划项目(2019JQ-680);中央高校基本科研业务费专项资金项目(300102219106)。

摘　　要：针对圆柱桥墩局部冲刷的防护问题,提出了碎石填充式透水桩群作为牺牲桩的新型防护形式。采用室内模型试验的方法,在透水桩孔隙率及淹没深度不变的条件下,研究了透水桩群布设形式(顶角60°等边三角形、顶角120°等腰三角形和180°横向排列)和布设位置(与桥墩的距离)对其自身局部冲刷特征及其减冲效果的影响规律。试验结果表明:与实体桩相比,透水桩群自身最大局部冲刷深度显著减小,透水桩群自身局部冲刷深度减小率随顶角角度增大而减小,最大可减小约23.5%,当透水桩群布设位置与被防护桥墩的距离为4D(D为桥墩的直径)左右时,透水桩群的减冲效果最好,最大减冲率可达65%,随着透水桩群顶角角度的增大,透水桩群自身局部冲刷减小率逐渐降低,而桥墩局部冲刷减小率逐渐增大,在相同的布设条件下,透水桩群的减冲效果与实体桩群防护效果接近。研究成果可为桥墩局部冲刷防护提供参考。Aiming at the local scour around the cylindrical piers,a new form of local scour protection gravel-filled permeable pile group was proposed.The influence of the arrangement(60°equilateral triangle,120°isosceles triangle and 180°lateral arrangement)and the position(distance from bridge pier)of permeable pile group on its own local scour characteristics and its scour reduction effect was studied,under the condition of a constant porosity and submerged depth of permeable piles using indoor model test.The results show that the maximum local scour depth of the permeable pile group is reduced significantly,compared with the solid piles.The reduction rate of the local scour depth of the permeable pile group decreases with the increase of the apex angle,and the maximum can be reduced by about 23.5%.When the distance between the permeable pile group and the pier is about 4D(D is the diameter of the pier),the scour reduction of the permeable pile group is the best,and the maximum reduction rate can reach 65%.With the increase of the angle of the permeable pile group,the local scour reduction rate of the permeable pile group decreases,and that of the pier increases.The protection effect of the permeable pile group is close to that of the solid pile group under the same conditions.The research results can provide reference for local scour protection of bridge piers.1 tab,15 figs,25 refs.

关 键 词：桥梁工程 局部冲刷 透水桩群 冲刷防护 清水冲刷 

分 类 号：U447[建筑科学—桥梁与隧道工程]