摘要
选择工业副产品木质素作为改良剂对粉土进行改良,通过界限含水率、颗粒分析、击实、静三轴等室内试验,对素土及掺木质素改良土的物理力学性质进行对比研究,确定改良土的物理力学特性变化规律和改良效果。试验结果表明:木质素对于土体颗粒级配有着明显的影响,随着掺量的增加,木质素改良土的液塑限较素土呈现降低的趋势,塑性指数略有降低;随着木质素的增加,改良土的最大干密度减小、最佳含水率增大。土体的抗剪强度随着围压的增大而增大,随着木质素掺量的增大而减小,最后趋于稳定的状态,养护期可根据实际情况进行养护。
The industrial by-product lignin was selected as a modifier to improve the silt.Through the indoor experiments such as boundary water content,particle analysis,compaction and static triaxial,the physical and mechanical properties of plain soil and lignin-modified soil were compared and determined.The change law and improvement effect of the physical and mechanical properties of the improved soil.The results show that lignin has a significant effect on soil particle gradation.With the increase of dosage,the liquid-plastic limit of ligninmodified soil is lower than that of plain soil,and the plasticity index is slightly reduced.With lignin the increase of the maximum dry density of the improved soil and the increase of the optimum moisture content.The shear strength of the soil increases with the increase of confining pressure,decreases with the increase of lignin content,and finally stabilizes.The curing period can be cured according to the actual situation.
作者
杨添元
董伟智
侯琳
YANG Tian-yuan;DONG Wei-zhi;HOU Lin(School of Transportation Science and Engineering Jilin Jianzhu University,Jilin Changchun 130118 China)
基金
吉林省交通运输科技项目“工业副产品木质素改良季冻土路基关键技术研究”,项目编号:2018ZDGC-14
关键词
粉土
界限含水率
最大干密度
最佳含水率
静三轴
抗剪强度
silt
boundary moisture content
maximum dry density
optimum water content
static triaxial
shear strength
