| 摘要: |
| 长江江苏段窝崩大多选用的树头石作为窝塘内的促淤结构型式,树头的砍伐对绿化和生态生产一定的不良影响；发明了由浮块、布匹(或土工布)、石块组成的布帘石,这种新型结构在窝塘内可起到阻流和促淤的效果,对此鲜有研究。对置于水流中的处于平衡状态时布帘石进行了受力分析,列出了微分方程,导出了布帘剖面的方程,由试验数据确定了公式中的系数。采用此公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,布帘石可减少树头石对生态的影响。 |
| 关键词: 长江河堤 治理 布帘石 窝崩 窝塘 |
| DOI： |
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| 基金项目: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(U2040215，51779148,51679147,52079080) |
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| Theoretical analysis and experimental study of new structural curtain-stone in pit pools |
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YING Qiang, ZHANG Xin-nong, JIA Dongdong, CHEN Changying
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Nanjing Hydraulic Research Institute
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| Abstract: |
| Abstract: In Jiangsu section of the Yangtze River, one of the most common silting-promoting structures in the pond is tree head-stone. As cutting trees has negative impact on greening and Ecology, the curtain-stone composed of floating block, cloth (or geotextile) and stone is invented.
This curtain-stone, can block the flow and promote the siltation, is seldom studied. The stress analysis of curtain-stone under the action of water flow is carried out when the tension and buoyancy are in balance. The differential equation is introduced. The formula of curtain section is derived, and the coefficient in the formula is determined with the experiment data. The formula can be used to determine the horizontal projection length and buoyancy of curtain-stone, and also explains the mechanical mechanism of floating block floating on or submerged in the water, 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 scour pools of the model. And the water blocking effect results are the same. Curtain-stone can reduce the impact of tree-head stone on ecology. |
| Key words: Yangtze River embankment bank collapse control curtain-stone pit collapse scour pools |
