基于木质素改良湿陷性黄土路用性能的试验分析
Test Analysis of Improving Road Performance of Collapsible Loess Based on Lignin
刘剑1
作者信息
- 1. 山西路桥第五工程有限公司,山西 太原 030012
- 折叠
摘要
通过分析黄土遇水软化的湿陷机制,探讨了目前工程中常用且行之有效的湿陷性黄土改良技术,并分析了各项改良方法的优劣势及影响因素.最后,以木质素改良黄土为例,分析湿陷性黄土路基改良技术的技术优势和工程价值,并研究了木质素掺量对改良黄土孔隙率、湿陷系数和入渗特性的影响.结果表明,木质素能促进松散颗粒的团聚,在土壤颗粒孔隙中形成网状结构,增强颗粒与土骨架之间的胶结强度,随着木质素掺量的增加,孔隙率逐渐减小;当木质素掺量为 2%时,湿陷性系数小于0.015,此时黄土试样的湿陷性已基本消除;同样,木质素改性黄土试样的饱和渗透系数明显低于普通试样.因此,使用木质素改良湿陷性黄土具有良好的路用性能.
Abstract
Based on the analysis of collapsible mechanism of loess softened by water,the paper discusses the improvement techniques of collapsible loess commonly used in engineering,and analyzes the advantages,disadvantages and influencing factors of each improve-ment method.Finally,taking lignin improved loess as an example,the technical advantages and engineering value of roadbed improve-ment technology in collapsible loess were analyzed,and the effects of lignin content on porosity,collapsibility coefficient and infiltration characteristics of the improved loess were studied.The results show that lignin can promote the agglomeration of loose particles,form a network structure in the pores of soil particles,and enhance the cementation strength between particles and soil skeleton.With the in-crease of lignin content,the porosity decreases gradually.When the lignin content was 2%,the collapsibility coefficient was less than 0.015,and the collapsibility of the loess sample was basically eliminated.Similarly,the saturation permeability coefficient of lignin modified loess samples was significantly lower than that of ordinary samples.Therefore,the use of lignin improving collapsible loess has good road performance.
关键词
黄土/湿陷性/路基/木质素/固结压缩Key words
loess/collapsibility/subgrade/lignin/consolidation compression引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据