WANG Honglei, ZHANG Hu, ZHANG Jianming, ZHANG Qi, YIN Zhenhua. 2024: Mechanical behaviors of warm and ice-rich frozen soil stabilized with sulphoaluminate cement. Journal of Mountain Science, 21(1): 335-345. DOI: 10.1007/s11629-023-8065-y
Citation: WANG Honglei, ZHANG Hu, ZHANG Jianming, ZHANG Qi, YIN Zhenhua. 2024: Mechanical behaviors of warm and ice-rich frozen soil stabilized with sulphoaluminate cement. Journal of Mountain Science, 21(1): 335-345. DOI: 10.1007/s11629-023-8065-y

Mechanical behaviors of warm and ice-rich frozen soil stabilized with sulphoaluminate cement

  • The warm and ice-rich frozen soil is characterized by high unfrozen water content, low shear strength and large compressibility, which is unreliable to meet the stability requirements of engineering infrastructures and foundations in permafrost regions. In this study, a novel approach for stabilizing the warm and ice-rich frozen soil with sulphoaluminate cement was proposed based on chemical stabilization. The mechanical behaviors of the stabilized soil, such as strength and stress-strain relationship, were investigated through a series of triaxial compression tests conducted at -1.0℃, and the mechanism of strength variations of the stabilized soil was also explained based on scanning electron microscope test. The investigations indicated that the strength of stabilized soil to resist failure has been improved, and the linear Mohr-Coulomb criteria can accurately reflect the shear strength of stabilized soil under various applied confining pressure. The increase in both curing age and cement mixing ratio were favorable to the growth of cohesion and internal friction angle. More importantly, the strength improvement mechanism of the stabilized soil is attributed to the formation of structural skeleton and the generation of cementitious hydration products within itself. Therefore, the investigations conducted in this study provide valuable references for chemical stabilization of warm and ice-rich frozen ground, thereby providing a basis for in-situ ground improvement for reinforcing warm and ice-rich permafrost foundations by soil-cement column installation.
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