Research on the time-lagged deformation properties of sandstone under #br#
different unloading stress paths
WANG Yu1，2，ZHENG Zihua2，LI Jin2，XIA Houlei2
(1. Hubei Key Laboratory of Disaster Prevention and Mitigation，China Three Gorges University，Yichang，Hubei 443002，China；2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education，
China Three Gorges University，Yichang，Hubei 443002，China)
Abstract：With the deep underground excavation of hard brittle surrounding rock，time-lagged rockburst frequently happens in high geostress environment. Considering the influence effect of unloading stress path，triaxial time-lagged deformation failure test and scanning electron microscopy(SEM) have been performed under different unloading confining pressure rates and different unloading confining pressure degree. A series of tests is to study the time-lagged deformation and failure characteristics of sandstone under different influence factors. The results indicated that the total time of time-lagged deformation stage exhibited increasing and then decreasing trends with the confining pressure unloading rates，and it exhibited decreasing trends with the confining pressure unloading levels. However，compared with unloading confining pressure with constant axial stress tests，the total time of time-lagged deformation stage under unloading confining pressure with loading axial stress tests was longer. Based on this and combining macroscopic observations，the time-lagged deformation failure was more significant under unloading confining pressure with loading axial stress tests. Additionally，through SEM image observation and EDS analysis，it indicated that mineral debris on fracture surface were closely related to the total time of time-lagged deformation stage under different influencing factors conditions. Finally，according to renormalization group theory，the staged damage constitutive model based on logistics function was established，and the effectiveness and rationality of model was proved. These research results can be used as a theoretical reference to study the development process of time-lagged rockburst.
王 宇1，2，郑子华2，黎 瑾2，夏厚磊2. 不同卸荷应力路径下砂岩时滞变形破坏特征研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3400-3414.
WANG Yu1，2，ZHENG Zihua2，LI Jin2，XIA Houlei2. Research on the time-lagged deformation properties of sandstone under #br#
different unloading stress paths. , 2023, 42(S1): 3400-3414.
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2023, Vol. 42 
