冻融作用下黏性土裂隙演化规律及分形特征研究
CRACK EVOLUTION AND FRACTAL CHARACTERISTICS OF CLAYEY SOILS UNDER FREEZE-THAW EFFECT
摘要
Abstract
Understanding the evolution of cracks under freeze-thaw action is key to revealing the mechanisms of soil frost heave and thaw settlement,which is crucial to guaranteeing the long-term safe service of structures in frozen soil engineering.In this paper,an isothermal freeze-thaw test was conducted on samples with different clay contents(5％,10％,15％,and 20％)at different environmental subfreezing temperatures(-5 ℃,-10 ℃,and-15 ℃),combined with Scanning Electron Microscopy and X-ray Computed Tomography Scanning technology for direct observation and three-dimensional(3D)reconstruction of the cracks,respectively.The development rules and evolution mechanisms of the cracks were investigated.The results showed that the volumetric content of cracks in the samples with 10％and 15％clay content at ambient temperatures below-10 ℃ was relatively high.Cracks propagated from the surface to the inside of the sample.The azimuth angles of the cracks were evenly distributed.The polar angles demonstrated that the cracks were mainly distributed within an angle of±30°from the horizontal plane.The 3D fractal dimension can well reflect the degree of crack development.The higher the value,the higher the crack content and irregularity.The mechanism of crack evolution can be concluded to be that the clay content affected the initial pore structure of the soil,the morphology of the clay aggregates,and the occurrence characteristics of inter-and intra-aggregate pore water.At different subfreezing temperatures,the difference in ice crystallization pressure inside and outside of clay aggregates leads to morphological changes of clay aggregates,such as shrinkage,expansion,crushing,and rearrangement,and the change of cementation mode between soil particles,which collectively governs the complex crack evolution during freeze-thaw.关键词
冻土/黏粒含量/冻融作用/裂隙演化/分形特征Key words
Frozen soil/Clay content/Freeze-thaw effect/Crack evolution/Fractal characteristic分类
建筑与水利引用本文复制引用
刘健鹏,王运敏,李小双,胡坤..冻融作用下黏性土裂隙演化规律及分形特征研究[J].工程地质学报,2025,33(6):2084-2094,11.基金项目
云南省中央引导地方科技发展项目(资助号:202407AC110019),国家自然科学基金项目(资助号:42277154,42477142),山东省自然科学基金项目(资助号:ZR2022ME188),江苏省青年科技人才托举工程(建设领域)(资助号:JSTJ-2024-JS007),江苏省教育厅面上项目(资助号:23KJB560001),江苏省建设系统科技项目(资助号:2023ZD028),常州市科技计划项目(资助号:CJ20241087),山东省高等学校"青创人才引育计划"边坡安全管控与灾害预防技术创新团队项目(资助号:鲁教科函[2021]51号),贵州省科技计划项目(资助号:黔科合支撑[2022]一般229),济南市"新高校20条"科研带头人工作室项目(资助号:20228108),江苏省中青年学术带头人项目(资助号:SCZ2509200010),常州大学高层次人才引进项目(资助号:ZMF24020037).This research is supported by the Science and Technology Projects of Yunnan Province(Grant No.202407AC110019),National Natural Science Foundation of China(Grant Nos.42277154,42477142),National Natural Science Foundation of Shandong Province of China(NSFC)(Grant No.ZR2022ME188),Jiangsu Province Young Scientific and Technological Talents Support Program(Construction Sector)(Grant No.JSTJ-2024-JS007),Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.23KJB560001),Jiangsu Province Construction System Technology Project(Grant No.2023ZD028),Changzhou Sci & Tech Program(Grant No.CJ20241087),the Project of Slope Safety Control and Disaster Prevention Technology Innovation Team of"Youth Innovation Talent Introduction and Education Plan"of Shandong Colleges and uni-versities(Grant No.Lu Jiao Ke Han[2021]No.51),Guizhou Province Science and Technology Plan Project(Grant No.Qiankehe Support[2022]General 229),Jinan City"New University 20"Research Leader Studio Project(Grant No.20228108),Jiangsu Provincial Qinglan Project for Mid-dle-aged Academic Leaders(Grant No.SCZ2509200010)and High-level Talent Introduction Project of Changzhou University(Grant No.ZMF24020037). （资助号:202407AC110019）
