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Deformation and failure characteristics of sandstone subjected to true-triaxial unloading: An experimental and numerical study
Fatigue & Fracture of Engineering Materials & Structures ( IF 3.7 ) Pub Date : 2021-04-21 , DOI: 10.1111/ffe.13470 Fan Xiao 1 , De‐Yi Jiang 1 , Fei Wu 1 , Jie Chen 1 , Jian‐Zhi Zhang 1, 2 , Wei Liu 1
Fatigue & Fracture of Engineering Materials & Structures ( IF 3.7 ) Pub Date : 2021-04-21 , DOI: 10.1111/ffe.13470 Fan Xiao 1 , De‐Yi Jiang 1 , Fei Wu 1 , Jie Chen 1 , Jian‐Zhi Zhang 1, 2 , Wei Liu 1
Affiliation
In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true-triaxial unloading behaviors of sandstone samples. The results show that as the level of σ1 at the unloading point increases, the ultimate bearing capacity of sandstone sample is increasingly strengthened, while the sample collapses more easily during the unloading process, and the failure mode of sample changes from mixed tensile-shear failure to shear failure. With the increase in the level of σ1, the accumulative micro-cracks at the unloading point and micro-crack generation rate during the unloading phase exhibit increasing trends, while the ratio between the number of tensile micro-cracks and shear micro-cracks generally shows a downward trend. The formation of macro fracture in sandstone sample is closely related to the material inhomogeneity and true-triaxial stress state.
中文翻译:
砂岩真三轴卸荷变形破坏特征实验与数值研究
在这项研究中,我们进行了实验室实验和离散元模拟,以研究最大主应力水平对砂岩样品真三轴卸载行为的影响。结果表明,随着卸载点σ 1水平的增加,砂岩试样的极限承载力不断增强,而在卸载过程中试样更容易坍塌,试样的破坏模式由拉剪混合破坏模式转变。剪切破坏失败。随着σ 1水平的增加,卸载点累积微裂纹数量和卸载阶段微裂纹产生率呈增加趋势,而拉伸微裂纹与剪切微裂纹数量之比总体呈下降趋势。砂岩样品宏观裂缝的形成与材料的不均匀性和真三轴应力状态密切相关。
更新日期:2021-06-04
中文翻译:
砂岩真三轴卸荷变形破坏特征实验与数值研究
在这项研究中,我们进行了实验室实验和离散元模拟,以研究最大主应力水平对砂岩样品真三轴卸载行为的影响。结果表明,随着卸载点σ 1水平的增加,砂岩试样的极限承载力不断增强,而在卸载过程中试样更容易坍塌,试样的破坏模式由拉剪混合破坏模式转变。剪切破坏失败。随着σ 1水平的增加,卸载点累积微裂纹数量和卸载阶段微裂纹产生率呈增加趋势,而拉伸微裂纹与剪切微裂纹数量之比总体呈下降趋势。砂岩样品宏观裂缝的形成与材料的不均匀性和真三轴应力状态密切相关。