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简要阐述了流-耦合模型的基本理论:Biot固结理论和有效应力原理,并讨论了非饱和土边坡中渗流场和应力场的相互影响;基于流-固理论和ABAQUS中耦合模型的建立,对三峡库区某滑坡在5种工况下稳定性分析研究。模拟计算结果表明:降雨入渗比库水位变动对该滑坡稳定性影响大,库水位变动对滑坡前缘土体影响较大,降雨入渗对滑坡浅层土体影响较大;利用ABAQUS中*Soils分析步分析边坡的流固耦合现象是可行的,在计算工况下,该滑坡处于稳定状态,与监测资料对比,模拟结果总体可靠,可以作为该边坡稳定分析评价及排水加固设计的依据。
The basic theory of flow-coupled model is briefly described: the Biot consolidation theory and the effective stress principle, and the interaction between the seepage field and stress field in unsaturated soil slopes is discussed. Based on the fluid-solid theory and the coupling model in ABAQUS , And analyzes the stability of a landslide in Three Gorges Reservoir Area under five conditions. The simulation results show that the change of water level in rainfall infiltration has a great influence on the stability of the landslide, and the change of reservoir water level has a greater influence on the landslide front soil. Rainfall infiltration has a greater influence on the landslide shallow soil. Using ABAQUS * Soils analysis step is feasible to analyze the fluid-structure interaction of slope. Under the condition of calculation, the landslide is in a steady state. Compared with the monitoring data, the simulation results are generally reliable and can be used as the analysis and evaluation of the slope stability and drainage reinforcement design in accordance with.