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Coupling analysis of seepage field and stress field of roller compacted concrete dam based on equivalent layer parameters
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摘要: 受施工、龄期、环境及服役期大坝承受的反复静动荷载等多因素影响，坝体和层面出现不同程度的劣化损伤，碾压层本体及层面物理参数呈渐变特性。针对碾压层内力学参数渐变的特性，提出了相应物理参数的等效算法，且给出了耦合性态参数间的数学转换关系，分析坝体应力场与渗流场相互影响机理，据此建立了考虑层内参数渐变的碾压混凝土坝渗流场与应力场耦合分析模型，并编制了相应的有限元分析程序。工程实例分析表明，耦合作用致使大坝的渗流场发生改变，坝体的应力较未耦合时普遍偏大，坝踵处的应力集中显著；渗流场与应力场耦合作用激励下的不利因素可为大坝的设计、施工及安全运行提供参考。Abstract: Under the influence of construction, age, environment and the repeated static and dynamic loads of the dam in service period, the dam body and the layer have different degrees of deterioration damage, and the mechanical parameters of the dam rolling layer and the surface layer show gradual change. According to the gradient characteristics of compacted layer mechanical parameters, the corresponding equivalent algorithm of physical parameters is proposed, and the mathematical transformation relation between coupling parameters is given. The interaction mechanism of stress and seepage is analyzed, then the coupling analysis model of seepage field and stress of the RCC dam considering the gradation of parameters in the layer is established, and the corresponding finite element analysis program is compiled. The engineering case study shows that the coupling effect leads to the change of the dam seepage field, the stress increases of the dam body, and the significant stress concentration at the dam heel. The unfavorable factors under the coupling of seepage field and stress field can provide a scientific basis for the design, construction and safe operation of the dam.
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Key words:
- roller compacted concrete dam /
- parameter gradient /
- equivalent analysis /
- coupling model
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