为改善湿陷性黄土路基沉降造成路面开裂等工程质量问题，采用碱激发可持续材料工业固废高炉矿渣（ground granulated blastfurnace slag, GGBS）对湿陷性黄土进行改良，探讨不同固化剂掺量对湿陷性黄土基本物理性质、力学特征、渗透性和湿陷性的影响规律，并从微观结构上阐述固化剂改良机理。研究结果表明：随着固化剂掺量的增加，固化土最优含水率呈现先减少后增大的趋势，最大干密度则表现为先增大后减少，10%掺量下最大干密度最优；固化剂对湿陷性黄土力学强度影响显著，强度随掺量的增加近似线性增加，20%掺量可提升至2.3 MPa，而6%固化剂掺量C_BR可提升至8.3%；渗透系数随固化剂掺量的增大而减少，10%固化剂掺量可将渗透系数降低至10^-7 m/s量级以下。湿陷系数随固化剂掺量增大而减少，固化剂掺量达6%时，固化土变为非湿陷性土，综合性能表明，10%掺量为路用需求的最优掺量；微观形貌上，固化剂改变了黄土颗粒的接触方式，黄土颗粒由点-面接触形式转化为面-面接触，孔隙尺寸由中孔隙和大孔隙向中孔隙转化，并且数量减少，大孔隙被填充，与重塑黄土相比，10%掺量固化土中，大孔隙和中孔隙分别从33.0%和31.5%减少至3.9%和14.8%，分别减少了29.1%和16.7%，其孔隙分布分形维数由1.12减小为0.96。通过碱激发GGBS固化湿陷性黄土，改良了黄土的湿陷性，其性能具有较好的路用前景，研究结果可为湿陷性黄土固化处置提供理论依据和实践参考。

In order to improve the engineering quality problems such as pavement cracking caused by excessive subgrade deformation caused by road use of collapsible loess, alkali activated sustainable material industrial solid waste GGBS(ground granulated blastfurnace slag was used to reinforce and improve the collapsible loess. The influence of different dosage of curing agent on the basic physical properties, mechanical characteristics, permeability and collapsibility of the solidified loess was discussed, and the improvement mechanism of the curing agent was expounded from the microstructure. The results show that the liquid plastic limit of solidified soil increases and the plasticity index decreases. The optimum moisture content decreases first and then increases with the increase of the content of curing agent. The corresponding maximum dry density increases first and then decreases. The maximum dry density of 10% of the content is 1.80 g/cm³. The strength of loess is improved by the curing agent. The strength increases linearly with the increase of the content. The content of 20% curing agent can increase to 2.3 MPa, while the C_BR value of 6% curing agent can increase to 8.3%. The permeability coefficient decreases with the increase of the content of the curing agent. When the content of the curing agent is 10%, the permeability coefficient can be reduced to below 10^-7 m/s, and the collapsibility coefficient decreases with the increase of the content of the curing agent. When the content of the curing agent reaches 6%, the solidified soil becomes non collapsible soil. The comprehensive performance shows that 10% of the content is the optimal amount for road use. In terms of microscopic morphology, the curing agent has changed the contact mode of loess particles. The loess particles have changed from point-surface contact to surface-surface contact. The pore size has changed from middle pore and macropore to middle pore, and the number has decreased. Macropores are filled. Compared with remolded loess, the macropores and mesopores in 10% stabilized soil have decreased from 33.0% and 31.5% to 3.9% and 14.8%, respectively, 29.1% and 16.7%, The fractal dimension of pore distribution decreases from 1.12 to 0.96. Through alkali activated GGBS to solidify collapsible loess, the collapsibility of loess is improved, and its performance has a good road use prospect. This study can provide theoretical basis and practical reference for the consolidation of collapsible loess.