市政技术2025，Vol.43Issue(5)：24-30,7.DOI:10.19922/j.1009-7767.2025.05.024
冻融循环作用下粉质黏土裂隙演化规律
Evolution Law of Cracks in Silty Clay Under Freeze-thaw Cycle Action
摘要
Abstract
In recent years,Jilin Province has experienced recurrent highway slope failures that seriously impact roadway operation.Soil samples were collected from landslide sites along highway slopes to conduct a comparative analysis between static compaction and slurry consolidation sampling methods.Ultimately,the slurry consolidation method was selected for sample preparation.The freeze-thaw cycling and CT scanning tests were performed for specimens under various conditions.The pseudo-color image processing techniques was employed to qualitatively examine crack evolution patterns in clay subjected to freeze-thaw cycles processes;Quantitative characterization was achieved through crack content and fracture length.The study results demonstrate that crack distribution character-istics emerging with increasing of freeze-thaw cycles times.Cross-section reveals a concentric crack propagation pattern evolving from exterior to interior regions and the cracks distributed in loop pattern.Longitudinal sections ex-hibit progressive top-down crack development along depth gradients;With the more higher freeze-thaw tempera-ture,specimens develope fewer cracks and demonstrated lower volumetric crack content after some freeze-thaw cy-cles;Consolidation overburden pressure exhibite limited influence on subsequent freeze-thaw crack propagation,but increased pressure moderately inhibited pore formation and development.Slope soil crack evolution is effected by not only initial void structures but also freeze-thaw cyclic times etc..During cycling processes,spices products new micro-cracks;Progressive freeze-thaw cycles induce gradual crack structure expansion and become complex.The more complex of the initial crack structures,the more long fractures after multiple freeze-thaw cycles.关键词
粉质黏土/边坡滑塌/冻融循环/裂隙演化/裂隙含量Key words
powdery clay/slope collapse/freeze-thaw cycle/crack evolution/crack content分类
建筑与水利引用本文复制引用
赵含,尹可..冻融循环作用下粉质黏土裂隙演化规律[J].市政技术,2025,43(5):24-30,7.基金项目
吉林省交通运输创新发展支撑(科技)项目 （科技）
