采矿与岩层控制工程学报2025，Vol.7Issue(3)：64-77,14.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1318
基于Micro-CT和DVC的单轴压缩下煤岩损伤特征研究
Study on damage characteristics of coal under uniaxial compression based on Micro-CT and DVC
摘要
Abstract
The study of the damage process of coal is essential to understand the changes of their mechanical behaviour and permeability properties.X-ray computed tomography(CT)was used to scan the coal rock in situ under uniaxial compression conditions.Combining the digital core technology and digital volume correlation method(DVC),the deformation displacement field and strain field of the coal rock were calculated.The fracture development and evolution law,the relationship between the dynamic evolution of coal rock damage and the permeability performance were analyzed.It is found that under uniaxial loading,the damage of the coal rock is caused by a combination of axial force and the development of adjacent fractures,resulting in the development of internal fractures and the phenomenon of fracture compaction.In addition,the minerals in the coal play a guiding role in fracture development,and the fractrue development are closely related to the shape and distribution of minerals.The DVC analysis shows that the damage process of the coal is a dynamic evolutionary process,and the accumulation of deformation difference along different directions in each region leads to the occurrence of damage.The vector superposition of the displacement field reveals the deformation of the coal matrix in different directions,while the strain field shows the lateral expansion of the fracture under axial compression.During the loading process,the development of pore fracture in coal results in the increase of permeability properties,especially at the 1 100 N stage,where the permeability increased by 149.35 μm2 and the maximum value of the damage variable DH was 8.2%.In addition,the number of connected pores and tortuosity τ were exponentially related to the damage variables.This study provides experimental data and theoretical support to deepen the understanding of the damage and permeability characteristics of coal.关键词
CT/DVC/单轴压缩/裂隙发育/损伤变量/渗透性Key words
CT/DVC/uniaxial compression/fracture development/damage variables/permeability分类
矿山工程引用本文复制引用
于岩斌,尼传文,崔文亭,臧杰,刘党辉,宋克志..基于Micro-CT和DVC的单轴压缩下煤岩损伤特征研究[J].采矿与岩层控制工程学报,2025,7(3):64-77,14.基金项目
国家自然科学基金资助项目(52074171,51934004) （52074171,51934004）
山东省自然科学基金优秀青年基金资助项目(ZR2023YQ047) （ZR2023YQ047）
山东省泰山学者工程专项经费资助项目(TS20190935,TSQN202408180) （TS20190935,TSQN202408180）
山东省高等学校青创科技计划创新团队资助项目(2021KJ010) （2021KJ010）
