| 摘要: |
| 描述了柔性坝坝体的结构和工作方式，基于力学机制分析和力矩平衡原理给出了单宽浮力的一般表达式。以钱塘江萧山杭州湾出海码头附近的河床及潮流为原型，建立了1:40正态水槽模型，通过试验研究了不同坝体形态条件下坝体底部拉力的变化情况，指出柔性坝底部拉力的大小与浮筒的大小、坝体长与水深的比值直接相关，得到了沙毯、沙枕束锚块柔性坝的起动流速及维持锚定系统稳定所需沙枕的尺寸和数量。柔性坝在不同潮位和不同流速情况下的整体稳定性试验结果表明：只要浮筒、坝高以及锚定系统选择适当，柔性坝能起到柔性、悬浮、活动和导流的作用，并能在一定的水流条件下保持稳定。作为一种创新工程措施，柔性坝结构可行性研究尚处于探索阶段，还有许多问题有待于进一步分析研究，并经工程实践检验，以期不断完善。 |
| 关键词: 柔性坝 拉力 稳定性 模型试验 导流坝 |
| DOI： |
| 分类号:TV644 |
| 基金项目:国家重点基础研究计划“973”项目（2012CB417001）；水利部“948”项目（210303） |
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| Experimental studies on tension and stability of a flexible dam |
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WANG Jian-zhong, FAN Hong-xia, ZHU Li-jun
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Nanjing Hydraulic Research Institute
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| Abstract: |
| The structure and working modes of a kind of flexible dam are described in this paper. A general expression for unit width buoyancy is given according to mechanic analysis and the principle of moment balance. Based on the prototype of riverbed terrain and current conditions around Xiaoshan Hanzhou bay delivery wharf in the Qiantang River， an undistorted flume model having a scale of 1:40 is established. The experiment results show that the tension at the bottom of the flexible dam is directly related with the size of the buoy and the ratio of the dam length and water depth. At the same time， the incipient velocity of the sandbag blanket and sandbag bundle used to anchor the flexible dam, and the size and quantity of sandbags needed to keep the anchorage system stable are obtained. The experiment results of the integral stability of the dam indicate that： the flexible dam with appropriate buoy, height and anchorage system can play a role in flexibility, suspension, movability and diversion， and can keep itself stable in some flow conditions. As a new engineering measure， there are quite a few studies on its theory and experiment. By comparison with the solid dam， the flexible dam has smaller negative influence， so the study in this paper has an important academic significance and can be used as a reference for similar works. For this new river engineering structure, it is still necessary to further study and improve it in the engineering practice. |
| Key words: flexible dam tension stability model test diversion dam |
