考虑流固耦合的降雨入渗过程对非饱和土边坡的影响研究

Research on the Influence of Rainfall Infiltration Process of Unsaturated Soil Slope Considering Fluid Solid Coupling

流固耦合是指固体在渗流场作用下的变形行为以及固体变形对渗流场影响这二者相互作用的理论,在探讨了渗流场与应力场相互作用机理后,提出了考虑渗流与应力直接耦合作用的非饱和土质边坡雨水入渗过程影响的有限元计算模型分析方法。基于ABAQUS分析软件,考虑了流固耦合和土水特征曲线,结合一典型非饱和土质边坡算例,对土坡受降雨入渗的影响进行了有限元数值模拟研究,得出了非饱和土质边坡基质吸力、饱和度、变形和稳定性受降雨影响的变化特征规律,指出了在工程设计中考虑耦合作用和雨水入渗影响的合理性和必要性,为进一步研究和相关工程设计防护提供参考。

Fluid solid coupling is the interaction between the deformation behavior of the solid under the action of the seepage field and the influence of the solid deformation on the seepage field,which has attracted more and more attentions from the scholars in soil and other related fields. Based on the investigation on the interaction mechanism of the seepage field and force field,a new analytical method using finite element calculation model was put forward.This new method considered the effect of seepage and stress direct coupling on unsaturated soil slopes under rainwater infiltration. With the consideration of fluid solid coupling and the soil water characteristic curve,the simulation research of a typical unsaturated soil slope under rainfall infiltration was conducted using ABAQUS. Through the simulation,the changing patterns of the matrix suction,saturation,deformation and stability of the unsaturated soil slope affected by rainfall was obtained,and the rationality and necessity of considering the coupling effect and rainfall infiltration in engineering design was pointed out. This will provide some reference for further research and engineering protection design.