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首页> 外文期刊>American journal of applied sciences >An Investigation on the Effect of the Coupled and Uncoupled Formulation on Transient Seepage by the Finite Element Method | Science Publications
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An Investigation on the Effect of the Coupled and Uncoupled Formulation on Transient Seepage by the Finite Element Method | Science Publications

机译：用有限元方法研究耦合和非耦合配方对瞬态渗流的影响|科学出版物

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> 2-D transient seepage beneath a dam was investigated by the finite element method. Governing equations were considered in coupled and uncoupled methods. At first stage, the fluid continuity equation for compressible porous media considered as uncoupled. Because of the occurrence of seepage forces, and their interaction with the fluid pore pressure, particularly in high compressible soils, uncoupled methods seem to be far from real conditions. Therefore force equilibrium equations were taken into account by coupling with the fluid continuity equation. Finite element formulation based on Galerkin method. Results of two mentioned methods were compared with steady-state seepage results. Comparing the results of coupled and uncoupled models showed that the time require to reach steady-state condition in coupled model considerably shorter than the uncoupled model. Coupled analyses shows that the effective stress due to seepage forces were smaller than ones calculated by the uncoupled method.
机译： >用有限元方法研究了坝下的二维瞬态渗流。在耦合和非耦合方法中考虑了控制方程。在第一阶段，可压缩多孔介质的流体连续性方程被认为是未耦合的。由于出现了渗流力及其与流体孔隙压力的相互作用，特别是在高压缩性土壤中，非耦合方法似乎与实际情况相去甚远。因此，通过与流体连续性方程耦合来考虑力平衡方程。基于Galerkin方法的有限元公式。将上述两种方法的结果与稳态渗流结果进行了比较。比较耦合模型和非耦合模型的结果表明，耦合模型中达到稳态条件所需的时间比非耦合模型要短得多。耦合分析表明，渗流力引起的有效应力要小于非耦合方法计算的有效应力。

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