In the context of rapid urbanization and industrialization, subterranean engineering frequently encounters geotechnical challenges, particularly when dealing with weak soil layers, such as loose silty sand. These layers are problematic due to their poor permeability and low mechanical strength. Although cement-based solidification methods are prevalent for improving soil properties, they may prove inadequate under certain extreme conditions. This study explores the solidification efficacy of graphene oxide (GO) alone, and in conjunction with silica fume (SF), on silty sand by integrating varying proportions of GO and SF into cement-based composite materials, with a focus on assessing their influence on the impermeability and mechanical properties of the solidified soil. The findings revealed that the incorporation of GO alone markedly decreased the permeability coefficient and enhanced the early bending and compressive strength of the solidified soil. Optimal impermeability and mechanical performance were attained at a GO concentration of 0.06%, attributed to GO's high specific surface area and superior adsorption capacity, which effectively filled internal soil voids and ameliorated the microstructure. When GO and SF were added together, the solidified soil's performance improved, especially at an SF content of 10%. Notably, even with reduced GO content, a significant decrease in permeability coefficient was observed, indicating a synergistic effect between the materials. The concurrent addition of GO and SF also had a positive impact on bending and compressive strength, notably enhancing the early and intermediate mechanical performance of the solidified matrix. After a curing period of 28 days, the growth trends of bending and compressive strength decelerated. Microscopic examination indicated that GO and SF addition optimized the pore structure of the solidified soil, diminishing macropores and augmenting micropores, thereby reducing the permeability coefficient and bolstering impermeability. X-ray diffraction (XRD) analysis demonstrated that although the addition of GO and SF did not alter the primary hydration products in the solidified soil, it facilitated the cement hydration reaction, leading to increased formation of hydrated calcium silicate gels and other hydration products, thereby enhancing the compactness and mechanical strength of the solid matrix.

来源平台：PROCEEDINGS OF THE 2024 8TH INTERNATIONAL CONFERENCE ON CIVIL ARCHITECTURE AND STRUCTURAL ENGINEERING, ICCASE 2024