风化花岗岩孔隙分形特征及孔隙结构的跨尺度研究

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-08 DOI:10.1144/qjegh2023-075
Kang Zhao, Jiale Chen, Jun Wu, Yajing Yan, Qizheng Huang, Qiang Nie, Weiling Xiao
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引用次数: 0

摘要

花岗岩的风化作用导致其破碎性能和力学性能减弱,矿物成分发生变化。为了探讨风化作用对花岗岩孔隙结构的影响与微观和精细尺度表征之间的关系,本文采用核磁共振技术对风化花岗岩的孔隙结构进行了测试。结合t2谱弛豫时间和分形理论,探讨了风化花岗岩孔隙分布特征。利用扫描电镜对易风化花岗岩的微观结构进行了监测。结果表明:根据孔隙大小分布特征,可将孔隙划分为小、中、大3大类;风化花岗岩中孔和大孔具有分形特征。与未风化花岗岩相比,风化花岗岩的小孔喉明显增多,中孔喉和大孔喉明显减少,在风化条件下扩展为微裂缝和微孔。风化花岗岩微观结构以片状、壳状为主,连通性好,导致风化花岗岩整体结构较差。
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Cross-scale study of pore fractal characteristics and pore structure of weathered granite
Weathering of granite leads to weakening of its crushing and mechanical properties, as well as changes in mineral composition. In order to investigate the correlation between the effects of weathering on granite and the characterization of the pore structure at the micro- and fine-scale, in this paper the pore structure of weathered granite is tested by the NMR technique. The pore distribution characteristics of weathered granite were explored in conjunction with T 2 spectral relaxation time and fractal theory. The microstructure of weathering-prone granite was monitored using scanning electron microscopy equipment. The results show that the pores can be classified into the three categories of small, medium and large pores based on their pore size distribution characteristics. Weathered granite has fractal features in the mesopores and macropores. Compared with unweathered granite, weathered granite has significantly more small pore throats and fewer medium and large pore throats, which expand into microfissures and micropores under conditions of weathering. The microstructure of weathered granite is mainly flaky and shell-like, with good connectivity, resulting in the poor overall structure of weathered granite.
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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