Research on Grouting Infiltration Mechanism for Time-Dependent Viscous Slurry Considering Effective Void Ratios in Saturated Clay
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摘要: 考虑强结合水膜对黏性土渗透特性的影响,依据土体物理特征参数建立有效孔隙比计算公式;修正经典的Kozeny-Carman渗透系数的经验公式,得到适用于黏性土的渗透系数经验计算公式;在此基础上,推导黏性土层中黏度时变性浆液注浆柱面和球面渗透扩散半径和渗透压力的计算公式.通过算例,验证了提出的黏性土渗透系数经验公式的正确性,并对比分析了不同注浆压力、注浆时间条件下是否采用有效孔隙比、是否考虑浆液黏度时变性对浆液扩散半径的影响.计算结果表明:采用天然孔隙比的扩散半径是采用有效孔隙比的扩散半径的约1.5倍,且两者的差距随注浆压力的增大、注浆时间的延长而增大;黏性土的渗透特性必须考虑强结合水膜的影响.Abstract: 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.
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