冻融循环下玻璃粉水泥固化黄土室内试验研究  

Indoor experimental study of glass powder cement solidified loess under freeze-thaw cycles

作　　者：吴瑞[1] 满大伟 包海玲[1] WU Rui;MAN Dawei;BAO Haiing(School of Construction Engineering,Anhui Technical College of Water Resources and Hydropower,Hefei 231603,China;College of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]安徽水利水电职业技术学院建筑工程学院,安徽合肥231603 [2]安徽建筑大学土木工程学院,安徽合肥230601

出　　处：《湖南文理学院学报(自然科学版)》2025年第2期40-47,共8页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：安徽省高校自然科学研究重点项目(2022AH052294)。

摘　　要：西北部季节性冻土区常年受冻融循环破坏,为提高黄土抗冻性能,开展不同掺量的水泥与玻璃粉对黄土固化,并在不同冻融循环次数下利用体积变化率、应力–应变、无侧限抗压强度及微观试验探究水泥与玻璃粉改良黄土机理。研究结果表明:掺入水泥与玻璃粉可有效降低黄土体积变化率;冻融循环0次时,不同掺量的水泥与玻璃粉黄土峰值应力所对应的应变分别为3.8%、2.4%、1.8%、1.5%、1.1%、1.3%,其中7%水泥与3%玻璃粉应变最小,说明适量水泥与玻璃粉可以提高黄土刚度;无侧限抗压强度随玻璃粉掺量增加呈先增加后下降趋势;随冻融循环次数增多,黄土内部孔隙增多,且孔径随孔隙的增多而增大,而水泥与玻璃粉的掺入可改善黄土内部结构,减小孔隙率,提高密实度。The seasonal permafrost area in the northwest is damaged by freeze-thaw cycles all year round.In order to improve the froze resistance of loess,different proportions of cement and glass powder were used to solidify loess,and the rate of volumetric change,stress-strain,unconfined compressive strength,and microscopic tests were analyzed to investigate the mechanism of improving loess with cement and glass powder in different numbers of freeze-thaw cycles.The research results show that cement and glass powder can effectively reduce the volume change rate of loess.At 0 freeze-thaw cycle,the strains corresponding to the peak stress of loess with different proportions of cement and glass powder are 3.8%,2.4%,1.8%,1.5%,1.1%,1.3%,and the strains of 7%cement and 3%glass powder are the smallest,which indicates that the appropriate amount of cement and glass powder can improve the loess stiffness.The unconfined compressive strength initially increases and then decreases with higher glass powder content.With the increase of freeze-thaw cycles,the internal pores of loess increase and pore diameter increases with the increase of pore,and the cement and glass powder can improve the internal structure of loess,reduce porosity,and improve compactness.

关 键 词：冻融循环 玻璃粉 重塑黄土 抗冻性能 微观结构 

分 类 号：TU578[建筑科学—建筑技术科学]