矿业科学学报2025，Vol.10Issue(2)：236-247,12.DOI:10.19606/j.cnki.jmst.2025001
基于CT图像的岩土细观REV确定及导热模拟
Representative elementary volume determination and heat conduction simulation for porous geomaterials based on CT images
摘要
Abstract
Macroscopic thermo-physical properties as well as heat and mass transfer processes in porous geomaterials are significantly affected by mesoscopic solid/fluid composition and pore/particle struc-ture.Given that,a fractal approximate criterion was proposed in the framework of continuum mechan-ics,aiming to determine the size of the porosity-based geotechnical representative elementary volume(REV).The criterion can be described as follow:the edge length of the cubic porosity REV approxi-mately equals to five times of the maximum pore diameter of the targeted geomaterials.Based on this new criterion,two types of porous geomaterials:sandstone and foamed concrete,were selected,and the sample CT scanning experiments were carried out.Accordingly,the 3D pore structures were recon-structed and analyzed using obtained 2D CT images,based on which the finite element simulation of 1D steady-state heat conduction was then conducted.The results indicate that:(1)the porosity REV is approximately the same size as the thermal conductivity REV;(2)the pore structure of artificial foamed concrete is relatively organized than that of natural sandstone;(3)orders of magnitude discrep-ancy in thermal conductivity of solid/fluid components and complex pore/particle structure have signifi-cant effect on the temperature distribution during heat conduction,which in turn leads to convergence,divergency and turning of conduction heat flow,finally causing variation of the macroscopic effective thermal conductivity(ETC)and resulting in complexity of related research efforts on the prediction of the ETC of tanglesome geomaterimals.关键词
多孔介质/表征单元体/孔隙率/热导率/分形Key words
porous media/representative elementary volume/porosity/thermal conductivity/fractal分类
矿业与冶金引用本文复制引用
谢传希,迟平,肖荣,褚召祥,李晓昭..基于CT图像的岩土细观REV确定及导热模拟[J].矿业科学学报,2025,10(2):236-247,12.基金项目
国家自然科学基金(42230704,42107156) （42230704,42107156）
徐州市科技计划(KC23383) （KC23383）
