山东农业大学学报（自然科学版）2024，Vol.55Issue(6)：836-847,12.DOI:10.3969/j.issn.1000-2324.2024.06.003
冻融裂隙岩坡损伤特性及本构模型研究
Research on Damage Characteristics and Constitutive Model of Freeze-Thaw Fractured Rock Slopes
摘要
Abstract
To study the freeze-thaw damage law of ditch slopes in cold regions,laboratory tests were conducted on N-type cracked rock samples subjected to 1,3,5,7,9,and 11 freeze-thaw cycles.Uniaxial compression tests were performed,and acoustic emission signals were recorded to analyze their strength characteristics,acoustic emission characteristics,and damage characteristics.A macro-micro coupling damage constitutive model was established and validated.The study found that after freeze-thaw cycles,the uniaxial compressive strength,damage strength,crack initiation strength,and elastic modulus of the rock samples significantly decreased,while the cumulative ringing count rate increased,and crack propagation during failure became more complex.The macroscopic damage variable was defined using classical damage theory,and the freeze-thaw damage variable was obtained by modifying the difference in open porosity.Considering the negative damage caused by the initial crack porosity compaction,a Weibull function was used for quantitative analysis of rock sample damage,establishing a micro-damage variable calculation model under load.Based on the theory of strain equivalence,the macroscopic total damage model was established,and the accuracy of the destruction framework was verified.关键词
冻融循环/N型裂隙/单轴压缩/声发射/本构模型Key words
Freeze-thaw cycle/N-fractures/uniaxial compression/acoustic emission/constitutive model分类
建筑与水利引用本文复制引用
刘子豪,栾亦荃,许峻豪,刘传孝..冻融裂隙岩坡损伤特性及本构模型研究[J].山东农业大学学报（自然科学版）,2024,55(6):836-847,12.基金项目
国家自然科学基金(51574156) （51574156）
青岛滨海学院科技计划研究项目(2024KQY13) （2024KQY13）
