纳米氧化镁石灰综合稳定黄土力学性能研究  

Study on the Mechanical Properties of Nano⁃MgO Lime Stabilized Loess

作　　者：李芳军 LI Fangjun(China Railway 21st Bureau Group Second Engineering Co.Ltd.,Lanzhou Gansu 730030,China)

机构地区：[1]中铁二十一局集团第二工程有限公司,甘肃兰州730030

出　　处：《铁道建筑技术》2023年第12期46-48,128,共4页Railway Construction Technology

基　　金：中铁二十一局集团第二工程有限公司科技研发计划课题(22⁃1)。

摘　　要：以纳米氧化镁石灰综合稳定的黄土为研究对象,通过无侧限抗压强度试验、回弹模量试验、承载比(CBR)试验及扫描电镜测试,研究纳米氧化镁掺量和养护龄期对综合稳定黄土力学性能的影响。结果表明:综合稳定黄土的无侧限抗压强度随纳米氧化镁掺量增加而增加;综合稳定黄土相比石灰稳定的黄土抗变形能力得到显著提升,但随纳米氧化镁掺量增加其抗变形能力提升效果并不明显;综合稳定黄土CBR值随养护龄期增长而增大,随纳米氧化镁掺量增加综合稳定黄土的CBR值得到进一步提升;扫描电镜结果显示,纳米氧化镁的掺入可使综合稳定黄土孔隙减少,土颗粒周围被絮状结构物包裹,土体骨架结构进一步加强。In this study,nano⁃MgO lime stabilized loess was taken as the research object.The effect of the nano⁃MgO content and curing period on the mechanical properties of the stabilized loess was explored by conducting the unconfined compressive strength test,resilience modulus test,bearing capacity ratio(CBR)test and scanning electron microscope(SEM)test.The results indicate that the unconfined compression strength increases with the increase in the nano⁃MgO content for the stabilized loess.Compared with the lime stabilized loess,the deformation resistance of synthetically stabilized loess is improved significantly,but the increase in the nano⁃MgO content has not presented an obvious effect on the deformation resistance for the synthetically stabilized loess.The CBR value of synthetically stabilized loess increases with the increase of curing period,and it is further improved with the increase of nano⁃MgO content.The SEM result shows that the introduction of nano⁃MgO causes the voids of the stabilized loess to decrease,and the surface of loess particles is wrapped by the flocculent material and thus the skeleton structure of loess is strengthened further.

关 键 词：黄土 纳米氧化镁 力学性能 室内试验 

分 类 号：TU411[建筑科学—岩土工程] TU444[建筑科学—土工工程]