Test Analysis of Improving Road Performance of Collapsible Loess Based on Lignin
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.
NETL
NSTL
万方数据
维普
