Study on the time delay failure characteristics of sandstone unloading under dynamic disturbance  

作　　者：Huafeng Deng Yening Huang Yao Xiao Pengfei Xu Jianlin Li Mingyang Wang 

机构地区：[1]Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University,Yichang,Hubei 443002,China [2]State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,Army Engineering University of PLA,Nanjing,Jiangsu 210007,China

出　　处：《Deep Resources Engineering》2024年第3期43-56,共14页深部资源工程（英文）

基　　金：the financial support provided by the National Natural Science Foundation of China(Grant No.U22A20600,U2034203).

摘　　要：The rockburst caused by underground engineering excavation exhibits a significant lag effect.Studies have shown that the occurrence of lag-type rockburst is closely related to the delayed failure of rocks.This paper focuses on the delayed failure characteristics of unloading-damaged sandstone under the combined action of static load and dynamic disturbance.Numerical simulations are utilized to analyze the delayed failure evolution characteristics and failure mechanisms of sandstone.The results indicate that in triaxial unloading delay failure tests,the duration of loading decreases exponentially with the increase of initial unloading damage.Compared to static load conditions,the duration of loading under dynamic disturbance decreases by more than 43%,and the average strain rate significantly increases.The number of cracks at the endpoint of triaxial unloading delay failure increases as initial unloading damage decreases,with a substantial increase in the number of cracks under dynamic disturbance.These findings provide a valuable reference for the timeliness and delayed rockburst analysis and interpretation of rock damage and failure under high-stress levels.

关 键 词：Time delay UNLOADING Deformation characteristics Destructive form Particle Flow Program 

分 类 号：TD3[矿业工程—矿井建设]