石灰改良高液限土试验研究  

Experimental Research on High Liquid Limit Soil Improved with Lime

作　　者：吴英兰 Wu Yinglan(Liaoning Highway Surveying and Designing Company,Shenyang 110006,China)

机构地区：[1]辽宁省公路勘测设计公司,沈阳市110006

出　　处：《北方交通》2023年第10期39-42,共4页Northern Communications

摘　　要：为研究无机胶凝材料石灰改良高液限土的实际改良效果,开展了一系列室内土工试验对石灰改良高液限土的物理力学特性进行研究。研究结果表明:随着石灰掺量的增加,高液限土的液限和塑性指数逐渐减小,塑限逐渐提高;石灰改良高液限土在水中的崩解量随着石灰掺量的增加逐渐减小,水稳定性变好;无侧限抗压强度随着石灰掺量的增加而增大,但是达到无侧限抗压强度时的应变减少,破坏呈脆性;扫描电镜试验表示石灰改良后高液限土的颗粒之间孔隙减少,接触方式从点接触变成面接触。In order to study the actual improvement effect of inorganic cementitious material like high liquid limit soil improved with lime,a series of indoor soil tests are conducted to study the physical and mechanical properties of the high liquid limit soil improved with lime.The research results show that:with the increase of mixing amount of lime,the liquid limit and plasticity index of high liquid limit soil gradually decrease,while the plastic limit gradually increases;the disintegration amount of the high liquid limit soil improved with lime in water gradually decreases with the increase of the mixing amount of lime,and the water stability becomes better;the unconfined compressive strength increases with the increase of the mixing amount of lime,but the strain decreases when reaching the unconfined compressive strength,and the failure is brittle;the scanning electron microscope test shows that the pores between particles in high liquid limit soil improved with lime decrease,and the contact mode changes from point contact to surface contact.

关 键 词：高液限土 石灰掺量 界限含水率 崩解量 无侧限抗压强度 微观结构 

分 类 号：U414.1[交通运输工程—道路与铁道工程]