考虑参数动态变化和相互关联的浆液扩散范围研究

Diffusion Range of Grout in Consideration of Dynamic Change and Correlation of Parameters

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。

In grouting treatment and seepage prevention,diffusion of grouts plays an important role,involving solid skeleton＇s stress-strain relation,seepage field distribution and grout concentration＇s distribution gradient perpendicular to the diffusing direction. According to coupling of seepage field and stress field in porous media,we take into consideration the time-varying viscous characteristics of grouting parameters,and dynamic variation of physical parameters of grouting in porous media,namely density,porosity,and permeability. On the basis of this,we analyze the correlation and dynamic change of physical parameters and present a simulation method for grouting diffusion. In the simulation of homogeneous soil under fluid-solid coupling,we use finite element method to obtain spherical diffusion radius and cylindrical diffusion radius under the conditions of time-varying viscosity and unchanged viscosity. Compared with conventional theory of grouting diffusion,fluid-solid coupling simulation taking soil parameters and dynamic characteristics of slurry into account is very suitable for analyzing diffusion range of slurry in soil.