矿业科学学报2025，Vol.10Issue(3)：418-434,17.DOI:10.19606/j.cnki.jmst.2025019
真三轴不同循环加卸载模式下砂岩的能量演化规律
Energy evolution of sandstone under different cyclic loading and unloading modes in true triaxial mode
摘要
Abstract
To clarify the impact of different cyclic loading and unloading modes on the energy evolution of sandstone,triaxial cyclic loading and unloading tests were conducted using the self-developed TAWZ-5000/3000 rock true triaxial testing system along different paths.By analyzing the stress-strain curves,the mechanical characteristics of sandstone were evaluated,revealing a linear functional rela-tionship between the elastic energy density,dissipated energy density,and input energy density of the sandstone.The results indicate that:(1)Under different cyclic loading and unloading modes,the hys-teresis loops exhibited distinct evolutionary characteristics with an increase in the maximum principal strain;under the same mode,increasing the number of cycles did not change the trend of hysteresis loop variation.(2)The failure strength and peak-to-valley strain of rock samples under different paths showed significant path dependence.The peak strength was lowest in the equal-amplitude cyclic load-ing and unloading mode,followed by the graded cyclic loading and unloading mode,with the stepped cyclic loading and unloading mode showing the highest peak strength.(3)In the equal-amplitude cy-clic loading and unloading mode,the energy density of rock samples was greater,with the input energy density and dissipated energy density in the direction of major principal stress rapidly declining and then stabilizing,while the elastic energy density remained constant;under the other two modes,the in-put energy density,elastic energy density,and dissipated energy density in the direction of major prin-cipal stress exhibited a positive correlation growth trend with an increase in the number of cycles.The energy density in the directions of minor and intermediate principal stresses was significantly lower than that in the direction of major principal stress.关键词
岩石力学/真三轴/循环加卸载模式/能量演化/损伤Key words
rock mechanics/true triaxial mode/cyclic loading and unloading mode/energy evolution/damage分类
矿山工程引用本文复制引用
张启航,孟祥瑞,赵光明..真三轴不同循环加卸载模式下砂岩的能量演化规律[J].矿业科学学报,2025,10(3):418-434,17.基金项目
国家自然科学基金(52374074) （52374074）
国家重点研发计划(2023YFC2907602) （2023YFC2907602）
安徽省高校优秀科研创新团队(2022AH010053) （2022AH010053）
