窝崩治理新型结构—布帘石的理论分析和试验研究  

Theoretical analysis and experimental study of new structural curtain-stone in pit pools

作　　者：应强[1] 张幸农[1] 假冬冬[1] 陈长英[1] YING Qiang;ZHANG Xinnong;JIA Dongdong;CHEN Changying(Key Laboratory of Port,Waterway and Sedimentation Engineering of Ministry of Transport,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院港口航道泥沙工程交通部重点实验室,江苏南京210029

出　　处：《水利水运工程学报》2021年第4期107-113,共7页Hydro-Science and Engineering

基　　金：国家重点研发计划资助项目(2018YFC0407302);国家自然科学基金资助项目(U2040215,51779148,52079080,51679147)。

摘　　要：长江江苏段窝崩大多选用树头石作为窝塘内的促淤结构型式,但树木的砍伐对绿化和生态产生一定的不良影响。提出了一种由浮块、布匹(或土工布)和石块组成的布帘石,该种新型结构在窝塘内可起到阻流和促淤的效果,但目前对此鲜有研究。通过对置于水流中处于平衡状态时的布帘石进行受力分析,建立作用在布帘石微元上各力平衡时的微分方程,进而解得布帘石沿水深方向分布曲线(面),由试验数据确定相关系数。采用此计算式可以确定布帘石的水平投影长度和浮力,也可解释浮块浮于水面或没入水中、布帘浮于水中或沉入河底等状态的力学机制。基于长江扬中河段指南村窝崩段的局部模型,就窝塘中布帘石、树头石的阻水效果进行了对比试验,结果表明两者阻水效果相当。同时,布帘石的利用可减少对生态的影响。In the Jiangsu reach of the Yangtze River,one of the most common silting-promoting structures in the cave collapses is tree top-stone.As cutting trees has negative impact on greening and ecology,a kind of curtain-stone composed of floating block,cloth(or geotextile)and stone is invented.This curtain-stone can block the flow and promote the siltation,which is seldom studied.Based on the force analysis of the curtain-stone placed in the equilibrium state in the flow,the differential equations of the forces acting on the curtain-stone micro element are listed,and then the distribution curve(surface)of the curtain-stone along the water depth can be solved,and the relevant coefficients in the curve are determined from the test data.The formula can be used to determine the horizontal projection length and buoyancy of curtain-stone,and also explain the mechanical mechanism of the floating block floating on or submerged in the water,and the curtain floating on or submerged in the river bottom.A local model of the pit collapse near Zhinan village in the Yangzhong section of the Yangtze River is established.The water blocking effects of curtain-stone and tree head-stone are compared in the scour pools of the model.And the water blocking effect results are the same.The use of curtain-stone can reduce the impact on ecology.

关 键 词：长江河堤 布帘石 窝崩 窝塘 

分 类 号：TV861[水利工程—水利水电工程]