土体微观结构定量分析方法探讨  

Discussion on Quantitative Analysis Method of Soil Microstructure

作　　者：李佳明[1] 唐世斌[1] 毕鹏雁 陈学军[3] LI Jiaming;TANG Shibin;BI Pengyan;CHEN Xuejun(State Key Laboratory of Coastal and Offshore Engineering,School of Civil Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Department of Civil and Surveying Engineering,Guilin University of Technology AT Nanning,Chongzuo 532100,Guangxi,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,土木工程学院,辽宁大连116024 [2]桂林理工大学南宁分校,土木与测绘工程系,广西崇左532100 [3]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《实验室研究与探索》2022年第3期34-41,共8页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(51874065,U1903112)。

摘　　要：以膨胀土为例,采用扫描电子显微镜(SEM)、压汞(MIP)、核磁共振(NMR)和Micro-CT试验对土样进行研究,揭示土体微观结构,对比分析4种方法研究土体微观结构特性的异同及适用性。结果表明:SEM得到的土体微观孔隙图片可以定性、直观地显示土中孔隙大小及其分布;MIP、NMR可以定量分析土体孔隙大小的分布,两者试验结果基本相同;Micro-CT能够将高精度数字图像作为数据分析的辅助手段,定量分析土体孔隙结构特征。Taking expansive soil as an example, the scanning electron microscope(SEM) test, mercury intrusion(MIP) test, nuclear magnetic resonance(NMR) test, and micro-CT test are used to study the soil samples to reveal the microstructure of the soil, contrastive analysis of four methods in studying the similarities and differences of soil microstructure characteristics and applicability. The results show that the microscopic pore picture of the soil obtained by the scanning electron microscope test can qualitatively and intuitively display the pore size and distribution in the soil. Mercury intrusion porosimetry and nuclear magnetic resonance test can quantitatively analyze the distribution of soil pore size, the test results of the two are basically the same;Micro-CT can use high-precision digital images as an auxiliary means for data analysis, and quantitatively analyze the characteristics of soil pore structure.

关 键 词：微观结构 扫描电子显微镜 孔隙大小分布 核磁共振 微CT 

分 类 号：TU411[建筑科学—岩土工程]