长沙理工大学学报（自然科学版）2025，Vol.22Issue(4)：172-183,12.DOI:10.19951/j.cnki.1672-9331.20250221003
不同冻结温度冻融循环下粉砂质泥岩劣化细观机理
Mesoscopic degradation mechanisms of silty mudstone under freeze-thaw cycles at different freezing temperatures
摘要
Abstract
[Purposes]This paper aims to investigate the effect of freezing temperature on the degradation characteristics and mesoscopic mechanisms of silty mudstone during the freeze-thaw cycle(FTC).[Methods]Triaxial compression tests were conducted on silty mudstone specimens under different freezing temperatures.By analyzing the failure form of the specimens and the scanning electron microscope image of the fractured surface,the strength deterioration characteristics and failure mode of the specimens were obtained.[Findings]Under the same confining pressure,a decrease in freezing temperature and an increase in the number of FTCs both resulted in an increase in the degradation rates of P-wave velocity and mass.Under the same freezing temperature,an increase in the number of FTCs led to a higher total number of cracks in the specimens and a reduction in the angle of the main cracks,along with a trend of crack expansion and penetration.Under the same number of FTCs,a decrease in freezing temperature resulted in an increased total number of cracks,more detachment of surface fragments,and a reduction in the integrity of the specimens.[Conclusions]The freezing temperature plays a critical role in the degradation of specimens during FTC.As the freezing temperature decreases,the strength deterioration of silty mudstone becomes more pronounced,with peak stress,elastic modulus,cohesion,and internal friction angle all exhibiting exponential declines.From a microscopic perspective,this degradation is manifested by an increase in porosity and pore size.关键词
粉砂质泥岩/冻融循环/三轴试验/岩石强度/细观机理Key words
silty mudstone/freeze-thaw cycle/triaxial test/rock strength/mesoscopic mechanism分类
建筑与水利引用本文复制引用
王子航,史振宁,段鑫波,吴俊哲..不同冻结温度冻融循环下粉砂质泥岩劣化细观机理[J].长沙理工大学学报（自然科学版）,2025,22(4):172-183,12.基金项目
湖南省自然科学基金项目(2025JJ50248) （2025JJ50248）
湖南省教育厅科学研究项目(22B0295) （22B0295）
长沙理工大学研究生科研创新项目(CSLGCX23138) National Natural Science Foundation of Hunan Province(2025JJ50248) （CSLGCX23138）
Scientific Research Project of Hunan Provincial Department of Education(22B0295) （22B0295）
Graduate Research and Innovation Project of Changsha University of Science&Technology(CSLGCX23138) （CSLGCX23138）
