| 水流对渗流的影响实验研究 |
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| 引用本文： | 谢立全,于玉贞,单宏伟.水流对渗流的影响实验研究[J].水科学进展,2008,19(4):525-530. |
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| 作者姓名： | 谢立全 于玉贞 单宏伟 |
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| 作者单位： | 1.同济大学土木工程学院, 上海, 200092; |
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| 摘 要： | 岸坡渗流是江河崩岸的主要诱因和重要研究内容之一.土力学中的渗流分析均建立在土体内部为低流速的层流、土体之外为静态水体的基础之上,而岸坡渗流之明显区别就在于土体之外的水体并非静态.利用新研制的实验设备,进行了不同切向水流流速、不同渗流水头差组合情况的水流渗流耦合试验,结果分析表明,水流对渗流有明显影响,并呈规律性变化:渗出面渗透比降越小,水流对透水性能的降低程度就越大,而比降超过一定数值后,水流将会增强透水性能.研究结果对江河两岸堤防等建筑物的安全评价将有着重要的理论价值和实用性.
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| 关 键 词： | 渗流 水流 崩岸 实验研究 |
| 收稿时间： | 2007-01-05 |
Experimental study on effect of water flow on seepage |
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| XIE Li-quan,YU Yu-zhen,SHAN Hong-wei.Experimental study on effect of water flow on seepage[J].Advances in Water Science,2008,19(4):525-530. |
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| Authors: | XIE Li-quan YU Yu-zhen SHAN Hong-wei |
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| Institution: | 1.School of Civil Engineering, Tongji University, Shanghai 200092, China;2.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The seepage in riverbank generally induces the bank-collapse so it is one of the key points in the research of this area.The seepage analysis now is based on the assumption that the flows inside and outside the bank slope are too slow to be considered,which ignored the fact that the flow velocity in the river is rather high,eg.2.5~4.5 m/s in the Yangtze River,China.A new experimental equipment is developed to invest igate the effect of flow velocity on the seepage in riverbank A series of tests are performed by combining various flow velocities and seepage heads.The test results indicat that the flow velocity obviously affects the seepage in the sand soil.When the seepage gradient at the seepage exit is lower than a certain value,the flow will weaken the seepage discharge; if the seepage gradient is higher than the certain value,the flow will increase the seepage discharge.The research will benefit the safety evaluation of the constructions along rivers. |
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