基于X-CT扫描技术的泡沫轻质土孔结构分析  

Pore Structure Analysis of Foamed Lightweight Soil Based on X-ray CT Scanning Technique

作　　者：刘杰民 李辉[2] 张宝华 刘波 郝宝锋 姜能栋 LIU Jiemin;LI Hui;ZHANG Baohua;LIU Bo;HAO Baofeng;JIANG Nengdong(Jinan-Qingdao High-speed Railway Co.Ltd.,Jinan 250100,China;School of Civil Engineering,Shandong University,Jinan 250062,China;China Railway 9th Bureau Group 1st Building Co.Ltd.,Suzhou 215000,China;School of Qilu Transportation,Shandong University,Jinan 250002,China)

机构地区：[1]济青高速铁路有限公司,济南250100 [2]山东大学土建与水利学院,济南250062 [3]中铁九局集团第一建设有限公司,苏州215000 [4]山东大学齐鲁交通学院,济南250002

出　　处：《北京工业大学学报》2024年第10期1228-1236,共9页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(52008234)。

摘　　要：为研究泡沫轻质土内部孔隙三维空间分布状态和形态特征,采用X射线计算断层扫描技术(X-ray computed tomography,X-CT)获取了3种湿密度等级泡沫轻质土孔结构,并进行定量分析。基于混合高斯模型,通过解卷积确定孔相和固相灰度阈值,根据阈值将灰度图像划分为孔和固体两相材料,定量表征孔隙率、孔径、球度和孔隙形态等孔结构特征参数。将孔结构特征参数与强度进行关联分析,结果表明:随着泡沫轻质土的湿密度增大,孔径分布更加均匀,平均孔径降低,球状孔隙增多,导致泡沫轻质土应力分布更加均匀,抵抗外部荷载能力更强,整体强度更高。To explore the spatial distribution and morphological characteristics of the pores in foamed lightweight soil.The pore structure of three wet densities of foamed lightweight soil were captured by X-ray computed tomography.Based on Gaussian mixture model,the grey scale threshold of pore and solid was determined by deconvolution and the grey scale images were divided into pore and solid binary materials according to this threshold.The characteristic parameters such as porosity,pore size,sphericity and pore shape were quantitatively characterized described and correlated with strength.Results show that as the wet density increases,the pore size distribution becomes more uniform,the average pore size decreases,and the number of spherical pore increases,which indicates result that the foamed lightweight soil has a more uniform stress distribution,greater resistance to external load and higher strength.

关 键 词：泡沫轻质土 X射线断层扫描技术 孔隙率 孔径 球度 孔隙形态 

分 类 号：TU528[建筑科学—建筑技术科学]