考虑有效孔隙比影响的饱和黏性土中注浆渗透机理
摘要
The calculation formula of effective void ratios was established according to the characteristic parameters of soil in view of the influence of the strong bound water layer on the permeability characteristics of clay. The empirical formula of permeability coefficients of clay was obtained through modification of the empirical formula of the Kozeny-Carman permeability coefficient. Based on the permeability coefficient of clay, the formulas for calculating the cylindrical and spherical diffusion radii and grouting pressures of time-dependent viscous slurry in saturated clay were derived. The empirical formula of permeability coefficients of clay was validated, then the diffusion radii with different grouting pressures and grouting times were compared between cases with or without the effective void ratio, and between cases with or without the time-dependent slurry viscosity. The results show that the diffusion radius with the natural void ratio is over 1.5 times larger than that with the effective void ratio, and the difference between them increases with the grouting pressure and the grouting time, so the permeability of clay is under the significant effects of the strong bound water layer.