西南交通大学学报2025，Vol.60Issue(5)：1131-1138,8.DOI:10.3969/j.issn.0258-2724.20230714
不同温度作用下砂岩能量演化机制及本构模型
Energy Evolution Mechanism and Constitutive Model of Sandstone Subjected to Different Temperatures
摘要
Abstract
To investigate the effect of high temperature on the deterioration of the physical and mechanical properties of sandstone,uniaxial compression tests were conducted on thermally-treated sandstone subjected to different temperatures.Firstly,the deterioration characteristics of macroscopic mechanical parameters of sandstone were obtained through the analysis of mechanical strength and failure modes.Secondly,the influence of different temperatures on the energy evolution mechanism and elastic energy dissipation ratio of sandstone was studied.Finally,combined with the temperature and load damage factor,the piecewise function method was applied to develop a thermo-mechanical coupling damage constitutive model,considering the crack closure stage.The results show that as temperature increases,the peak strength and elastic modulus of thermally-treated sandstone increase first and then decrease,reaching a maximum value at 200℃.The failure mode transforms from oblique shear to"Y"-shaped conjugate tension-shear mixed failure,with the critical temperature threshold for the brittle and ductile transition occurring at 400℃.Based on dissipated energy evolution characteristics,the deformation and failure process is primarily divided into crack closure,elastic,macro-crack extension,and post-peak stages.The turning point of the elastic energy dissipation ratio(K)serves as the critical point where sandstone transitions from elastic to plastic behavior.The model's size parameter(m)first increases and then decreases with increasing temperature,while the shape parameter(n)gradually decreases,reflecting the strength and plasticity of sandstone.The good agreement between the theoretical model and the laboratory results indicates that the model can invert the whole process of damage development of sandstone under thermo-mechanical coupling conditions.关键词
岩石力学/高温处理/耗散能/本构模型Key words
rock mechanics/thermally-treated sandstone/dissipated energy/constitutive model分类
建筑与水利引用本文复制引用
雷瑞德,周林森,胡超,李梦来,黄凌..不同温度作用下砂岩能量演化机制及本构模型[J].西南交通大学学报,2025,60(5):1131-1138,8.基金项目
中国博士后科学基金(2023MD744136) （2023MD744136）
重庆市博士后研究项目(2022CQBSHTB3109) 桥梁无损检测与工程计算四川省高校重点实验室开放课题基金(2022QZJ01). （2022CQBSHTB3109）
