新型木质素基凝胶改良砂质土固结能力及其作用机理研究OACHSSCD

Sandy soil,characterized by loose texture and fragile structure,is highly susceptible to erosion,which may induce geological hazards such as loess landslides and soil erosion,and ultimately leading to severe ecological and environmental issues.In this study,a novel LS/PVA/CMC gel consolidator using lignin and other eco-friendly materials was prepared to investigate its consolidation effect in sandy soil application.The experimental results showed that,the excellent water stability was exhibited by the consolidated sandy soil,with structural integrity maintained for over 8 months under optimal immersion conditions.Effective consolidation performance was confirmed through direct shear tests,where chemically cross-linked consolidators were observed to significantly outperform physically cross-linked counterparts.The maximum cohesive force and internal friction angle can reach 610.66 kPa and 48.4094 °,respectively.Enhanced structural stability and compression resistance were revealed by the consolidation tests.The void ratio of the consolidated structure remained at 0.414 after the addition of 2 mL of the gel consolidating agent before compression,representing twice the value recorded in the control test.The results showed that effectiveness of the lignin-based gel consolidated material was effective in improving water retention capacity of the sandy soil,which was verified by the saturated hydraulic conductivity tests.The findings demonstrate that the consolidating agent exhibits effective sand consolidation performance,providing valuable reference for research on sand consolidation,water retention,and soil improvement.