岩土工程学报2024，Vol.46Issue(z2)：150-154,215,6.DOI:10.11779/CJGE2024S20022
木质素改良黄土工程性质与加固机理
Engineering properties and reinforcement mechanism of lignin-modified loess
摘要
Abstract
To effectively improve its weak engineering properties,the industrial by-product lignin is selected to improve the strength of the loess.The specific gravity,Atterberg limit,maximum dry density-optimal moisture content,and unconfined compressive strength(UCS)of the lignin-modified loess are tested by configuring the modified loess with different lignin contents.The engineering properties of the lignin-modified and the compacted loess are studied.The feasibility of the lignin-modified loess is discussed.Based on the results of the SEM,XRD,physical and mechanical properties tests,the reinforcement mechanism of the lignin-modified loess is analyzed.The results show that compared with that of the compacted loess,the specific gravity of the lignin-modified loess is significantly reduced.The liquid limit,plastic limit and plasticity index are reduced.Moreover,the maximum dry density and the optimum moisture content decrease.The lignin content and curing age significantly affect the engineering properties of the modified loess.When the curing age is 28 days and the lignin content is equal to 2%,the UCS of the modified loess is the highest,which is 32%higher than that of the compacted loess.The reinforcement mechanism of the lignin-modified loess mainly includes the interstitial effects of the lignin on the loess,cementation,clay mineral,ion exchange and electric double-layer adsorption.关键词
木质素/改良处理/抗压强度/SEM/XRDKey words
lignin/modified treatment/compressive strength/SEM/XRD分类
建筑与水利引用本文复制引用
王谦,王兰民,刘钊钊,钟秀梅,高中南..木质素改良黄土工程性质与加固机理[J].岩土工程学报,2024,46(z2):150-154,215,6.基金项目
甘肃省地震局创新团队项目(2020TD-01-01) （2020TD-01-01）
国家自然科学基金项目(51778590) （51778590）
中国地震局地震预测研究所基本科研业务经费项目(2023IESLZ5,2021IESLZ03) （2023IESLZ5,2021IESLZ03）
