扭工字块体防护群桩桥墩局部冲刷效果研究
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摘要
在采用透水扭工字块体防护桥墩局部冲刷的措施中,由于扭工字块体自身的透水能力允许部分水流穿越防护体系,构成扭工字块体的杆件对水流产生干扰作用,消耗水流的紊动能量,有效削减了行近水流的流速。透水扭工字块体防护体系内部的近底流速小于河床泥沙的起动流速,这保证了河床床面泥沙不被冲走,还能使上游水流带来的泥沙部分落淤在防护体系内部。相对于传统的抛石防护方式,透水扭工字块体防护方式采用的扭工字块体重量较大、重心较低、结构稳定性较好,不会因水流冲积而翻滚、流失,非常适用于桥梁水下基础的冲刷防护。
In the measures of partial scouring of piers with permeable dolosses,the permeable function of the dolosses allows some of the water to flow through the protection system,through which the members of the dolosses interfere with the water flow,the turbulence of the water flow is consumed,and proximate flow rate is effectively reduced.The near-bottom flow velocity inside the permeable dolosse protection system is smaller than that of the river bed sediment,which ensures that the sediment on the river bed is not washed away,and the sediment caused by the upstream water flow is deposited in the protection system.Compared with traditional riprap protection method,the permeable dolosse protection system has a large weight,a low center of gravity,and a favorable structural stability,which does not tumble and lose due to water flow alluvial,which is very suitable for scour protection for underwater foundation of bridges.
In the measures of partial scouring of piers with permeable dolosses,the permeable function of the dolosses allows some of the water to flow through the protection system,through which the members of the dolosses interfere with the water flow,the turbulence of the water flow is consumed,and proximate flow rate is effectively reduced.The near-bottom flow velocity inside the permeable dolosse protection system is smaller than that of the river bed sediment,which ensures that the sediment on the river bed is not washed away,and the sediment caused by the upstream water flow is deposited in the protection system.Compared with traditional riprap protection method,the permeable dolosse protection system has a large weight,a low center of gravity,and a favorable structural stability,which does not tumble and lose due to water flow alluvial,which is very suitable for scour protection for underwater foundation of bridges.
引文
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[2]房世龙,陈红,施小飞.三杆六脚体对桥墩周围流场影响的试验研究[J].人民长江,2015,(10):61-66.
[3]伍琼芳,颜艳芬,蒋国俊,等.溇水大桥墩柱冲刷的流—固耦合分析[J].公路工程,(2):240-244,25.
[4]房世龙.局部冲刷坑形成影响桥墩附近流场特性的试验研究[J].水运工程,2009,(11):143-152.
[5]房世龙,施小飞,倪飞.桥墩局部冲刷远程实时监测技术研究进展[J].公路工程,2015,(6):88-95.
[6]牟献友,王丹,冀鸿兰,等.环翼式防冲板对圆端形桥墩局部冲刷试验及水力特性[J].南水北调与水利科技,2017,(5):146-155
[7]房世龙,陈红,施小飞.桥墩清水局部冲刷减速不冲防护技术防护效果试验研究[J].重庆交通大学学报(自然科学版),2016,(3):43-49
[8]房世龙,钱俊峰,施小飞.圆柱桥墩清水局部冲刷透水三杆架体防护特性试验研究[J].水电能源科学,2015,(8):98-102.
[9]李春江,牟献友,王祚,等.环翼式桥墩防冲板类型优选试验研究[J].中国科技论文,2015,(7):846-850.
[10]房世龙,施小飞.三杆六脚透水架体护滩水力特性试验[J].水运工程,2015,(4):157-162.
[11]成兰艳,牟献友,文恒,等.环翼式桥墩局部冲刷防护试验[J].水利水电科技进展,2012,(3):14-18.
[12]房世龙,钱俊峰,施小飞.河流岸滩冲刷笛卡尔架构块抛投防护效果试验[J].人民黄河,2015,(9):49-53.