| 河流冲刷对堤岸渗流和变形的影响研究 |
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| 引用本文： | 张芳枝,陈晓平.河流冲刷对堤岸渗流和变形的影响研究[J].岩土力学,2011,32(2):441-447. |
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| 作者姓名： | 张芳枝 陈晓平 |
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| 作者单位： | 1.暨南大学 力学与土木工程系，广州 510632；2.广东水利电力职业技术学院 水利工程系，广州 510635 |
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| 基金项目： | 广东省水利科研及技术推广项目，广东水利科技创新项目 |
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| 摘 要： | 通过理论分析和有限元技术，建立了综合考虑河流冲刷力、渗透力、自重应力耦合力系下的堤岸（水上、水下）与河床的整体分析模型，直接分析河流冲刷作用对堤岸渗流和变形的影响，并结合强度折减有限元法分析河流冲刷对堤岸边坡整体稳定性的影响。结果表明，渗透流速的最大值出现在堤脚，冲刷作用使堤岸的渗透流速有所提高，并使堤岸坡脚沿外江方向的水平位移明显增加，愈靠近坡脚，外江方向水平位移增加的幅度愈大，在不同水位下堤脚都是最易受到渗流和冲刷影响的地方；河流冲刷进一步加大了堤岸和河床塑性区范围，堤岸的安全系数降低；河流冲刷对堤岸渗流和变形产生的影响随着河水位的上升而加剧，河水位越高，冲刷作用使堤岸稳定性降低的幅度越大。
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| 关 键 词： | 堤岸 河流冲刷 渗流应力耦合分析 稳定性 强度折减有限元法 |
| 收稿时间： | 2010-01-26 |
Study of river scour effect on seepage flow and deformation and stability of embankments |
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| ZHANG Fang-zhi,CHEN Xiao-ping.Study of river scour effect on seepage flow and deformation and stability of embankments[J].Rock and Soil Mechanics,2011,32(2):441-447. |
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| Authors: | ZHANG Fang-zhi CHEN Xiao-ping |
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| Institution: | 1. Department of Mechanics and Civil Engineering, Jinan University, Guangzhou 510632, China; 2. Department of Hydraulic Engineering, Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou 510635, China |
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| Abstract: | Whole analysis model about the bank slope (above water and underwater) and the riverbed was established to study directly the influence of river scour effect on seepage flow and deformation of embankments by using theoretical analysis and finite element technique. Tractive force of river, gravity stress and seepage force is considered comprehensively in the model. Moreover, the influence of river scour on the whole stability of embankment slope is also analyzed by strength reduction FEM. The results indicate that the maximum value of seepage velocity occurs at the toe of embankment slope; and the river scour increases seepage velocity in slope to some extent. Horizontal displacement of the slope increases greatly considering effect of river scour. The closer it is to the toe of slope, the bigger the increase of displacement becomes. What’s more, the toe of embankment slope suffers from the influence of seepage flow and river scour most easily for different water levels. Plastic-strain range expands further in embankment and riverbed, and the safety factor of embankment reduces when the effect of river scour is considered. In addition, influence of river scour on seepage flow and deformation and stability of embankment increases with the rising of river water level. |
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| Keywords: | embankment river scour seepage-stress coupling analysis stability shear strength reduction FEM |
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