摘要
结合扫描电镜、压汞试验等方法,研究了高液限红黏土的微观结构,重点分析了红黏土的孔径分布、孔隙分形、比表面积等特征,建立了高液限红黏土微观结构与宏观力学特性的关系。试验结果表明:红黏土孔隙结构以蜂窝状为主,残留有片状高岭石粒团,孔隙分布较均匀且表面较粗糙,孔径集中分布在100~1000 nm,最可几孔径为609.7 nm,具有较高的热力学分形维数;红黏土总比表面积为17.5~27.5 m^(2)/g,具有较强的亲水性与胀缩性,导致其表层容易形成裂隙;红黏土高液限土边坡易出现因坡脚泡水软化而失稳的破坏形式。
The microstructure of high liquid limit red clay was studied by means of scanning electron microscope and mercury injection test.The pore size distribution,pore fractal and specific surface area of red clay were analyzed,and the relationship between micro-structure and macro-mechanical properties of high liquid limit red clay was established.The test results show that the pore structure of red clay is mainly honeycomb,and there are still flaky kaolinite particles.The pore distribution is uniform and the surface is rough.The pore size is concentrated in the range of 100~1000 nm,and the most probable pore size is about 609.7 nm,which has a high thermodynamic fractal dimension.The total specific surface area of red clay is 17.5~27.5 m^(2)/g,which has strong hydrophilicity and expansibility,resulting in cracks in the surface layer.Red clay high liquid limit soil slope is prone to failure due to softening of slope toe by soaking water.
作者
于荣喜
YU Rongxi(China Railway Shanghai Design Institute Group Co.Ltd.,Shanghai 200070,China)
出处
《铁道建筑》
北大核心
2022年第6期143-147,共5页
Railway Engineering
关键词
铁路工程
高液限红黏土
微观结构
工程特性
扫描电镜
压汞试验
railway engineering
high liquid limit red clay
microstructure
engineering properties
scanning electron microscope
mercury intrusion test
