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土体注浆加固与防渗施工引起的浆液扩散过程,涉及固体骨架应力应变、浆液的渗流场分布以及浆液浓度垂直于扩散方向的分布梯度等问题。基于多孔介质渗流场和应力场的耦合作用,考虑注浆浆液参数的粘时变特性,以及注浆过程中多孔介质的密度、孔隙率、渗透率等物性参数的动态变化,分析注浆过程中的土体物性参数相互关联性和动态变化过程,给出了浆液时变和多孔介质参数动态变化的渗流场与应力场耦合的注浆扩散的模拟实现过程。采用有限单元法对均质土体进行流固耦合作用下注浆扩散范围的数值模拟,得到了黏度时变和黏度不变条件下的球形扩散半径和柱面扩散半径范围。与经典注浆扩散理论对比分析可知,考虑浆液时变特性、土性参数的动态变化和相互关联的流固耦合作用模拟可以很好地分析土体中浆液扩散范围。
Soil grouting reinforcement and seepage control construction caused by the slurry diffusion process involves the stress and strain of the solid skeleton, the seepage field distribution of the slurry and slurry concentration perpendicular to the distribution direction of the diffusion gradient. Based on the coupling effect of seepage field and stress field in porous media, considering the time-varying characteristics of grouting slurry parameters and the dynamic changes of physical properties such as density, porosity and permeability of porous media during grouting, The relationship between seepage field and stress field in the dynamic change of slurry time-varying and porous media parameters was simulated and simulated. The finite element method (FEM) was used to simulate the grouting diffusion of homogeneous soils under fluid-solid interaction. The spherical diffusion radius and cylindrical diffusion radius under the condition of constant viscosity and constant viscosity were obtained. Comparing with the classical theory of grouting diffusion, it can be seen that considering the time-varying characteristics of slurry, the dynamic changes of soil parameters and the inter-related fluid-structure interaction simulation, the diffusion range of slurry in soils can be well analyzed.