| 余湘娟,王路军,张幸农,应 强.堤岸退水速度判别指标的试验研究[J].水利学报,2005,36(8):0919-0924 |
| 堤岸退水速度判别指标的试验研究 |
| Model study on discrimination parameter for drawdown velocity of dike |
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| DOI： |
| 中文关键词: 模型试验 堤岸 退水速度 判别指标 非稳定渗流 |
| 英文关键词: model test dike drawdown velocities discrimination parameter unsteady flow |
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| 摘要点击次数: 2024 |
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| 中文摘要: |
| 通过高水位长时间持续作用下不同退水速度的大型室内模型试验，观测不同退水过程的坡体内固定测点的水头变化过程，研究了坡体内孔压消散过程。研究表明，坡体内孔压消散指标和降速评价指标呈对数逻辑增长型函数关系，并得到了背水侧有补给源条件下均质土堤的退水速度判别指标界限值，同时，根据逻辑增长型函数特点得到一种求解退水速度判别指标界限值的简化方法。借助于非稳定渗流有限元分析，研究了多种因素对退水速度判别指标界限值的影响。研究表明，退水速度判别指标界限值的对数值与水位降幅和补给源水位之间呈现很好的平行线性关系，并且可以通过正交试验分析得到三者之间的经验关系式。 |
| 英文摘要: |
| The variations of water head distribution in levee, which submerged in long term high flood level,in the process of different drawdown velocities are measured in model test. It is found that the relationship between the logarithmic index for assessing the drawdown velocity and the index expressing the pore water pressure dissipation obeys a logistic curve law. The critical discrimination index of drawdown velocity for levee with homogeneous soil under the condition of having recharge source in the land-side of the levee is deduced,and a simplified method for determining the critical discrimination index is proposed based on the logistic relationship. Furthermore,the influences of various factors on critical discrimination index of drawdown velocity are studied by means of FEM for unsteady seepage flow in the levee.The result shows that the logarithm of critical discrimination index of drawdown velocity is linearly related to the amplitude of water level variation and water level of recharge source. |
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