| 练继建,杨弘,李福田.水垫塘底板稳定性的动位移响应识别方法研究[J].水利学报,2007,38(6):717-723 |
| 水垫塘底板稳定性的动位移响应识别方法研究 |
| Method for predicting the stability of plunge pool slabs based on identification of dynamic displacement response |
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| DOI： |
| 中文关键词: 水垫塘底板 失稳 动位移响应 有限元模型 |
| 英文关键词: plunge pool slab unstability dynamic displacement response finite element model |
| 基金项目: |
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| 中文摘要: |
| 利用水垫塘防护结构动位移响应原型观测成果，建立了水垫塘底板、水体、基岩、锚固钢筋的耦合有限元模型，并可据此计算出不同破坏状态下底板块的极限动位移。以二滩工程为例，分析了该工程水垫塘底板失稳破坏各个阶段的动位移响应特性，发现止水未破坏时，振动位移标准差一般不超过10μm，底板振动信号的偏态系数CS在-0.5
～+0.5之间，峰度系数CE位于2.0～4.0之间，水垫塘底板的振幅比系数λ位于0.5～1.5之间；分析还发现水垫塘底板的振动信号满足统计自相似性，止水未破坏时其分形盒维数都在105以上；在止水破坏后，振动位移标准差及振动信号的偏态系数、峰度系数、振幅比系数将超出上述范围，振动信号维数下降到0.95以下，据此可对水垫塘底板的稳定性进行识别。 |
| 英文摘要: |
| Based on the prototype observation data of dynamic displacement response of plunge pool slabs a finite element model coupling the actions of slab, water flow, riverbed rock and anchor reinforcement is established. The ultimate dynamic displacements of the slabs during different modes of failure can be calculated. The model is applied to analyze the dynamic displacement response of the slab
s in Ertan Project during different stage of failure. It is found that the mean square deviations of dynamic displacement of the slabs are less than 10μm with skewness coefficient ranging from -0.5 to +0.5, before the failure of water seal occurred. The coefficient of kurtosis coefficient varies from 2.0 to 4.0, the coefficient of amplitude ratio is ranging from 0.5 to 1.5. Further analysis reveals that a characteristics of self similarity exits in the vibration signals. The fractal number is higher than 1.05. Whereas, after the occurrence of water seal failure, the value of square deviation of dynamic displacement, kurtosis coefficient and coefficient of amplitude ratio will be paranormal and the fractal number will reduced to lower than 0.95. According to this study result the stability of slabs can be identified. |
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