摘要
为了研究不同干密度花岗岩残积土的孔隙结构特征,首先采用高分辨率三维X射线显微镜采集花岗岩残积土CT图像,再利用Avizo软件重构花岗岩残积土孔隙三维结构,定量分析了3种干密度花岗岩残积土的孔隙连通性、孔隙曲折度、孔径分布、孔隙方向、分形维数等孔隙结构特征。结果表明:通过三维重构方法可以完整而精准地表征花岗岩残积土的孔隙结构特征;随着花岗岩残积土干密度增大,孔隙度减小、孔隙曲折度增大、连通性减弱、孔隙方向越接近水平方向;压实花岗岩残积土的孔隙主要由较大等效直径的孔隙提供。
In order to study the pore structure characteristics of granite residual soil with different dry densities,firstly,the CT images of granite residual soil were collected by high-resolution three-dimensional X-ray microscope.Then the three-dimensional pore structure of granite residual soil was reconstructed by Avizo.Meanwhile,the pore connectivity,pore tortuosity,pore size distribution,pore direction and fractal dimension of three dry density granite residual soils were quantitatively analyzed.The results show that the pore structure characteristics of granite residual soil can be characterized completely and accurately by three-dimensional reconstruction method.With the increase of dry density of granite residual soil,porosity decreases,pore tortuosity increases,connectivity decreases,and pore direction is closer to horizontal direction.Besides,the pores of compacted granite residual soil are mainly provided by pores with larger equivalent diameter.
作者
孙广
谈勋勋
刘金明
王志兵
SUN Guang;TAN Xun-xun;LIU Jin-ming;WANG Zhi-bing(College of Civil Engineering,Guilin University of Technology,Guilin 541004,China;Third Engineering Company,China Construction Fifth Engineering Bureau,Changsha 410004,China;Guangxi Key Laboratory of Rock-soil Mechanic&Engineering,Guilin 541004,China)
出处
《河南城建学院学报》
2022年第1期18-23,32,共7页
Journal of Henan University of Urban Construction
基金
广西自然科学基金项目(2017GXNSFAA198092)。
关键词
花岗岩残积土
CT
图像处理
干密度
孔隙结构特征
granite residual soil
CT
image processing
dry density
pore structure characteristics
