Yuan Guohui, Cao Xiaomeng, Gao Ziyang, Ni Junfeng, Li Xiaobing, Fu Hongtao, Wu Jianqi, Zhou Chenyang
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, China.
Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou, China.
Sci Rep. 2024 Dec 28;14(1):31475. doi: 10.1038/s41598-024-83237-2.
To investigate the influence of cations on the microstructural characteristics of electrochemical reinforcement in soft clay, a study was conducted using three different cationic salt solutions-NaCl, CaCl₂, and FeCl₃-for grouting treatment. Four sets of indoor experiments were performed to examine the reinforcement mechanism of the electrochemical method. The findings indicate that increasing the valence of injected cations significantly affects the electrochemical reinforcement effect and the soil's microstructural properties. Higher-valence cations notably enhanced the soil's electrical permeability coefficient and conductivity, leading to a substantial improvement in shear strength. Furthermore, the pore volume of the soil increased following electrochemical treatment compared to soil treated solely by electro-osmosis, due to the flocculation effect induced by cation injection. Nevertheless, the pore size distribution became more uniform, especially in the cathode region, as a result of pore redistribution. The chemical cementation reactions triggered by Ca and Fe injections mitigated the impact of flocculation on the microstructure, resulting in a more favorable pore volume and size distribution compared to Na treatment.
为研究阳离子对软黏土电化学加固微观结构特征的影响，采用三种不同的阳离子盐溶液——氯化钠、氯化钙和氯化铁——进行注浆处理研究。开展了四组室内试验以考察电化学方法的加固机理。研究结果表明，增加注入阳离子的价态会显著影响电化学加固效果和土体的微观结构特性。高价阳离子显著提高了土体的电渗透系数和电导率，从而使抗剪强度大幅提高。此外，与仅通过电渗处理的土体相比，电化学处理后土体的孔隙体积增加，这是由于阳离子注入引起的絮凝作用。然而，由于孔隙重新分布，孔径分布变得更加均匀，尤其是在阴极区域。钙和铁注入引发的化学胶结反应减轻了絮凝对微观结构的影响，与钠处理相比，导致孔隙体积和孔径分布更有利。
