西南交通大学学报2025，Vol.60Issue(3)：608-617,10.DOI:10.3969/j.issn.0258-2724.20230314
基于核磁共振技术的硬石膏岩孔隙结构冻融损伤特性
Freeze-Thaw Damage Characteristics of Anhydrite Rock Pore Structures Based on Nuclear Magnetic Resonance Technology
摘要
Abstract
In order to study the damage characteristics of meso and micro pore structures of gypsum rock subjected to freeze-thaw cycles in cold regions,anhydrite rock was taken as the research object,and the porosity,pore size,and pore throat distribution characteristics of anhydrite rock were obtained based on nuclear magnetic resonance(NMR)experiments.According to fractal theory,the calculation formulas of the fractal dimension of pore size and pore throat of rock were derived,and the influence of freeze-thaw cycles on the fractal dimension of pore structures of anhydrite rock was discussed.The relationship among different pore structures,fractal dimensions of pores,and porosity was established,and the pore structure types that had a greater impact on porosity were revealed.The results show that the pore size of anhydrite rock under freeze-thaw cycles presents a"three-peak"distribution.With the increase in freeze-thaw cycles,the micropore(r≤0.100 μm),PT-Ⅰ(r∈(0,0.100]μm)of pore throat,fractal dimension of pore(DP),and fractal dimension of pore throat(DPT)decrease exponentially.While,the mesopores(r∈(0.100,1.000)μm),macropores(r≥1.000 μm),PT-Ⅱ(r∈(0.100,4.000]μm)of pore throats,and porosity increase exponentially.It can be concluded that larger pores,as well as smaller pore throats and fractal dimension of pore throats,have a greater influence on the porosity of anhydrite rock.关键词
核磁共振/硬石膏岩/孔隙结构/冻融循环/损伤特性Key words
nuclear magnetic resonance/anhydrite rock/pore structure/freeze-thaw cycle/damage characteristic分类
建筑与水利引用本文复制引用
候超,靳晓光,何杰,方智远..基于核磁共振技术的硬石膏岩孔隙结构冻融损伤特性[J].西南交通大学学报,2025,60(3):608-617,10.基金项目
国家重点研发计划(2021YFB3901402) （2021YFB3901402）
重庆市交通科技项目(2022-05) （2022-05）
河南省科技攻关项目(242102320218) （242102320218）
