黑龙江科技大学学报2025，Vol.35Issue(2)：249-255,7.DOI:10.3969/j.issn.2095-7262.2025.02.012
宏细观尺度下冻融红砂岩的损伤特性
Damage characteristics behind freeze-thaw red sandstone at macro and micro scales
摘要
Abstract
This paper intends to investigate the damage evolution law behind freeze-thaw red sand-stone.The achievement is made by using uniaxial compression tests and CT scanning tests,and combi-ning three-dimensional reconstruction and damage theory to study the damage evolution characteristics of freeze-thaw red sandstone from both macro and micro perspectives.The results show that as the freeze-thaw process deepens,the axial compressive strength of red sandstone decreases from 42.34 MPa to 22.86 MPa,and the elastic modulus decreases from 11.1 GPa to 4.06 GPa.Based on the microscopic parameters extracted from a macroscopic model of freeze-thaw red sandstone through 3D reconstruction,the average pore radius and porosity of red sandstone increase with the increase of freeze-thaw cycles.The fractal dimension gradually decreases from 2.29 to 2.10 with the increase of freeze-thaw cycles,and after 15 freeze-thaw cycles,the fractal dimension decreases mostly.There is a bigger overlap between macro damage variables and micro damage variables of red sandstone,indicating that the macro freeze-thaw fail-ure process of red sandstone can be well revealed from the perspective of micro changes.关键词
红砂岩/冻融循环/三维重建/分形维数/损伤变量Key words
red sandstone/freeze thaw cycle/3D reconstruction/fractal dimension/damage variable分类
建筑与水利引用本文复制引用
高红梅,徐立,杨帆,李洪伟..宏细观尺度下冻融红砂岩的损伤特性[J].黑龙江科技大学学报,2025,35(2):249-255,7.基金项目
黑龙江省省属高等学校基本科研业务费项目(2023-KYYWF-0533) （2023-KYYWF-0533）
国家自然科学基金项目(52474218) （52474218）
