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Effects of prior cyclic loading damage on failure characteristics of sandstone under true-triaxial unloading conditions
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ijrmms.2020.104379 Fan Xiao , Deyi Jiang , Fei Wu , Quanle Zou , Jie Chen , Bo Chen , Zhongguang Sun
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ijrmms.2020.104379 Fan Xiao , Deyi Jiang , Fei Wu , Quanle Zou , Jie Chen , Bo Chen , Zhongguang Sun
Abstract To investigate the effects of prior cyclic loading damage in rocks on subsequent unloading failure characteristics under true-triaxial conditions, a series of complicated unloading tests incorporating the damage-controlled cyclic loading path and stress σ3 unloading path was conducted using a true-triaxial test system. The experimental results reveal that the prior cyclic loading damage has an impact on the strength and deformation characteristics, energy conversion and failure mode. As the number of prior cyclic loads increases, the unloading strength and Young's modulus increase firstly and then decrease, while the peak unloading strain, as well as the ratio (η) of crack damage stress to peak unloading stress, exhibits a descending trend. The energy storage capacity of rock samples is dramatically reduced as cycle number increases to 10 and enlarged slightly with a further increase in cycle number. Both shear fracture and tensile fracture appear in each rock sample under this unloading condition, as the prior cyclic loading number increases, the dominant failure mode of rock samples changes from tensile failure to mixed tensile-shear failure, then to shear failure, while the failure angle ranging from 65° to 80° deceases firstly and then turns to rise.
中文翻译:
真三轴卸载条件下先前循环加载损伤对砂岩破坏特性的影响
摘要 为了研究真三轴条件下岩石先前循环加载损伤对后续卸载破坏特性的影响,采用真三轴试验进行了一系列复杂的卸载试验,包括损伤控制循环加载路径和应力σ3卸载路径。系统。实验结果表明,先验循环载荷损伤对强度和变形特性、能量转换和破坏模式有影响。随着先前循环载荷次数的增加,卸载强度和杨氏模量先增大后减小,而峰值卸载应变,以及裂纹损伤应力与峰值卸载应力的比值(η)呈下降趋势。随着循环次数增加到10次,岩石样品的储能能力急剧下降,并随着循环次数的进一步增加而略有增大。在这种卸载条件下,每个岩样均出现剪切断裂和拉伸断裂,随着先验循环加载次数的增加,岩样的主要破坏模式由拉伸破坏向拉剪混合破坏,再到剪切破坏,而65°到80°的角度先下降后上升。
更新日期:2020-08-01
中文翻译:
真三轴卸载条件下先前循环加载损伤对砂岩破坏特性的影响
摘要 为了研究真三轴条件下岩石先前循环加载损伤对后续卸载破坏特性的影响,采用真三轴试验进行了一系列复杂的卸载试验,包括损伤控制循环加载路径和应力σ3卸载路径。系统。实验结果表明,先验循环载荷损伤对强度和变形特性、能量转换和破坏模式有影响。随着先前循环载荷次数的增加,卸载强度和杨氏模量先增大后减小,而峰值卸载应变,以及裂纹损伤应力与峰值卸载应力的比值(η)呈下降趋势。随着循环次数增加到10次,岩石样品的储能能力急剧下降,并随着循环次数的进一步增加而略有增大。在这种卸载条件下,每个岩样均出现剪切断裂和拉伸断裂,随着先验循环加载次数的增加,岩样的主要破坏模式由拉伸破坏向拉剪混合破坏,再到剪切破坏,而65°到80°的角度先下降后上升。