河南理工大学学报（自然科学版）2025，Vol.44Issue(6)：9-17,9.DOI:10.16186/j.cnki.1673-9787.2025030063
冻融循环作用下尾矿宏观力学损伤与微观结构影响研究
Macromechanical damage and microstructural effects of tailings under freeze-thaw cycles
摘要
Abstract
Objectives This study aims to reveal the macro-micro damage mechanisms of tailings materials under freeze-thaw cycling.Methods Through triaxial consolidated undrained shear tests,scanning electron microscopy(SEM),and micro-CT scanning,the effects of freeze-thaw cycle frequency on the mechanical properties and microstructural evolution of tailings were investigated.A correlation mechanism between mac-roscopic mechanical damage and microstructural changes was established.Results Freeze-thaw cycles sig-nificantly degraded the macroscopic mechanical properties of tailings.The peak shear strength decreased by 13.35%after one freeze-thaw cycle.During the 5～10 cycle stage,the peak strength reduction rate was 8.8%,while in the 10～15 cycle stage,the reduction rate decreased to 3.9%.After 15 cycles,cohesion and internal friction angle decreased by 50.9%and 59.3%,respectively.Freeze-thaw cycling caused particle edge abrasion and rounding,with the shape factor decreasing from 1.38 to 1.34.The pore fractal dimension increased from 1.55 to 1.64,porosity rose from 8.9%to 16.91%,and the proportion of connected pores in-creased markedly from 4.68%to 15.51%.Furthermore,porosity exhibited a nonlinear negative correlation with shear strength,while the internal friction angle showed an exponential increase with particle shape fac-tor.Conclusions These findings provide a scientific basis for stability analysis and disaster prevention of tailings dams in permafrost regions.关键词
尾矿/冻融循环/力学损伤/微观结构Key words
tailings/freeze-thaw cycle/mechanical damage/microstructure分类
资源环境引用本文复制引用
张超,汤杰,刘勇锋,马昌坤,陈青林,曾鹏..冻融循环作用下尾矿宏观力学损伤与微观结构影响研究[J].河南理工大学学报（自然科学版）,2025,44(6):9-17,9.基金项目
国家重点研发计划项目(2023YFC3012200) （2023YFC3012200）
国家自然科学基金资助项目(52304155) （52304155）
江西省自然科学基金资助项目(20232BAB213069) （20232BAB213069）
宜春市重大科技攻关项目(2023ZDKJGG04) （2023ZDKJGG04）
