Collapsibility test on the loess inhibited by lignin
Subsidence or even destruction of the foundation of structures in the loess area is often caused by the collapsibility of loess,which poses a serious threat to the infrastructure construc-tion in these areas.Improving loess can help alleviate and reduce the harmful effects of collaps-ibility.Therefore,this paper investigates the collapsible loess improved by the environmental-friendly degradable industrial waste,that is,lignin.Lignin-modified loess can substantially reduce collapsibility,and the improvement mechanism is explained from the perspective of the deformation mechanism and microstructure.Research results show that 2％lignin content elimi-nated the collapsibility of the loess sample,and 4％lignin content yielded the best improvement effect.From the perspective of the deformation mechanism,the addition of lignin changes the lo-ess structure.Therefore,the structural instability induced by the collapsibility is released during the pre-pressurization period.From the viewpoint of microstructure,lignin generates new cements between loess particles,which enhances the bonding force between particles.Overall,la-boratory experiment results verified the effectiveness of lignin in inhibiting collapsibility.A satis-factory improvement effect is realized by 2％lignin content.The use of lignin conforms to the concept of green construction,improves the utilization rate of industrial byproduct lignin,and provides a new reference for solving the collapsible problem in practical projects.
collapsible loessligninimproved soilloess collapsibility test
万方数据
维普
