Effects of drying-wetting cycles at different temperatures on the strength properties of fibre-lime improved Yunnan laterite
This study explores the effect and mechanism of glass fiber and lime in improving Yunnan lateritic soil under different wetting-drying cycle conditions.Through unconfined compressive strength tests,direct shear tests,X-ray diffraction(XRD),and scanning electron microscopy(SEM),the optimal fiber and lime contents were determined,and the effects of the number of wetting-drying cycles and drying temperature on the strength and mineral composition of the lateritic soil and composite soil was analyzed.The results show that the composite improvement significantly enhanced the strength of the lateritic soil.As the number of wetting-drying cycles increased,the shear strength of the lateritic soil decreased while the shear strength of the composite soil first increased and then decreased.The shear strength of the lateritic soil varied significantly across different temperatures while the shear strength of the composite soil increased with drying temperature.With rising drying temperatures,the quartz content in the lateritic soil first decreased and then increased while the calcium carbonate content in the composite soil increased.The SEM analysis reveals that the composite improvement by glass fiber and lime enhanced bonding strength,inhibited crack development,improved the microstructure of the soil,and mitigated the erosive effect of wetting-drying cycles,thereby improving the strength and resistance of the lateritic soil to wetting-drying cycles.
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