Abstract

Stabilization/solidification (S/S) has been examined as an effective way to strengthen soft soils. However, the presence of organic matter (OM) in dredged marine silt can substantially weaken the reinforcement effect of S/S. To treat organic silt that is difficult to strengthen by S/S, a new combined application of S/S and electroosmosis (EO) treatments was adopted in this paper to increase the strength of soft soil. To enrich the current knowledge about combined soft soil treatment methods, as well as to study the mechanism of increasing the strength under combined S/S-EO treatments, silts with different OM and cement contents were stabilized, and then EO was carried out after certain precuring times. Different test methods, including bearing capacity tests, scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP), etc., were conducted. The experimental results showed that both OM and cement can reduce the EO resistivity of samples, and the combined application of S/S-EO treatments can significantly improve the bearing capacity of organic silt, with a maximum increase of 80.5%. Additionally, the combined application solves the problem of soil cracking and detachment between electrode and soil. Finally, the micromechanism of S/S-EO is discussed considering the number of cement hydration products and pore diameter.

摘要

稳定/固化 (S/S) 已被视为强化软土的有效方法。然而，疏浚的海相淤泥中有机物 (OM) 的存在会大大削弱 S/S 的加固效果。针对S/S难以强化的有机淤泥，本文采用S/S和电渗（EO）处理的新组合应用来增加软土的强度。为了丰富目前关于软土联合处理方法的知识，以及研究 S/S-EO 联合处理提高强度的机制，稳定不同 OM 和水泥含量的粉土，然后经过一定的 EO 处理。预固化时间。不同的测试方法，包括承载力测试、扫描电子显微镜（SEM）和压汞孔隙率（MIP）等，进行了。实验结果表明，OM和水泥均能降低样品的EO电阻率，S/S-EO处理联合应用可显着提高有机粉土的承载力，最大提高80.5%。此外，组合应用解决了土壤开裂和电极与土壤之间的脱离问题。最后，考虑水泥水化产物的数量和孔径，讨论了S/S-EO的微观机理。组合应用解决了电极与土壤之间的土壤开裂和脱离问题。最后，考虑水泥水化产物的数量和孔径，讨论了S/S-EO的微观机理。组合应用解决了电极与土壤之间的土壤开裂和脱离问题。最后，考虑水泥水化产物的数量和孔径，讨论了S/S-EO的微观机理。