矿渣粉改良分散性土的工程特性研究  

Engineering Characterization of Dispersed Soil Improved by Slag Powder

作　　者：鲁博[1] 李树武[1] 贺子城 王莉平[2] 郭文涛 焦少通 LU Bo;LI Shuwu;HE Zicheng;WANG Liping;GUO Wentao;JIAO Shaotong(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西安理工大学,西安710048

出　　处：《西北水电》2024年第4期24-32,共9页Northwest Hydropower

基　　金：陕西省重点研发计划项目(2022SF-197).

摘　　要：分散性土的抗冲蚀能力较低,易发生管涌、流土等破坏,作为建筑材料存在较大的工程隐患。通过对矿渣微粉改性分散性土进行分散性鉴定试验、单轴抗压试验以及压缩试验,来探讨其力学性质,以确保在工程中的使用效果。试验表明:随着矿渣微粉掺量的提高和养护龄期的增加,抑制了土体的分散性,提升了土体的力学性质,降低了其压缩性,矿渣微粉掺量达到7%,养护7 d以上,其改性效果较佳;从微观角度来看,矿渣微粉加入到分散性土样中,发生水化反应以及离子置换反应,通过降低双电层厚度,提供胶结物质使土颗粒变得紧密,填充土体孔隙降低土体的分散性,改善了土体的力学特性。The dispersed soil has low erosion resistance and is prone to damage such as pipe surges and gullies,which has great engineering risk as a construction material.In this paper,the dispersibility identification test,uniaxial compression test and compression test are carried out on slag micronized modified dispersed soil to explore its mechanical properties to ensure the effectiveness of its application in the project.The test results show that:with the increase of slag micronized powder doping and the increase of maintenance age,the dispersion of the soil body is suppressed,the mechanical properties of the soil body are improved,and the compressibility is reduced;when the doping of slag micronized powder is up to 7%,and the maintenance is more than 7 days,the modification effect is better.From the microscopic point of view,slag micro powder added to the dispersed soil samples,the hydration reaction and ion replacement reaction occurred,by reducing the thickness of the double electric layer,providing cementing material to make the soil particles compact,filling the pores of the soil body to reduce the dispersion of the soil as well as improving the mechanical properties of the soil.

关 键 词：分散性土 矿渣粉 抗压强度 压缩模量 

分 类 号：TV443[水利工程—水工结构工程]