为了解利用自行研制的水玻璃基固化剂制备的淤泥固化土的渗透性,结合扫描电镜试验和压汞试验,分析了土体的微观结构和孔径分布特征随固化剂掺量改变的规律;基于有效孔隙理论建立了一维渗透微分方程,并在此基础上提出一种细粒土的常水头渗透性测试方案,将其应用于固化土的渗透性测试中。通过反压饱和和卸载试验,建立有效孔隙率增量与孔隙水压力的函数关系;利用常水头渗透性测试和数值计算获取土体的渗透性参数。通过测试研究了固化土渗透性参数随固化剂掺量改变的规律。结果表明:随着固化剂掺量增加,固化土颗粒团块结构和孔隙率均呈增大趋势;固化土初始有效孔隙率 n_0 \mathrm{和}起始水力梯度 i_0单调递减,绝对有效渗透系数 k先减小再增大,当掺入比为7%时最小。

To investigate the permeability of sludge solidified soil prepared using a self-developed water glass-based curing agent, the microstructure and pore size distribution characteristics of the soil were analyzed using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) with varying amounts of curing agent. Based on the effective porosity theory, a one-dimensional permeation differential equation was established, and a constant head permeability test scheme for fine-grained soil was proposed and applied to the permeability testing of the solidified soil. Through back pressure saturation and unloading tests, the relationship between the effective porosity rate increment and the pore water pressure function was established, and the permeability parameters of the soil were obtained through constant head permeability testing and numerical calculations. The permeability parameters of the solidified soil were studied with varying curing agent content. The results showed that with increasing amounts of curing agent, both the particle structure and porosity rate of the solidified soil increased. The initial effective porosity rate and starting hydraulic gradient of the solidified soil decreased monotonically, while the absolute effective permeability coefficient initially decreased and then increased, reaching a minimum value at a curing agent ratio of 7%.