Experimental study on impact failure characteristics of coal and rock based on SHPB dynamic load process
Sun Xiaoyuan1, Li Jihui1*, Ding Hao2, Jin Tingxu1, Xie Jianlin1, Liang Lei1
1. School of Safety and Emergency Management Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Abstract: In order to fully explore the failure characteristics of coal and rock under impact dynamic load and further clarify the mechanism of system instability, SHPB dynamic load system was used to carry out impact failure of coal and rock specimens at different speeds, and fragments were collected for screening test. The results showed that the particle size distribution of coal rock specimen was determined by the impact loading speed and the physical properties of the medium. With the increase of impact loading speed, the damage degree of coal and rock increased, the number of broken bodies increased significantly, and the fragment size decreased accordingly. Under the similar impact loading speed, the physical properties of the medium became the dominant factor determining the distribution law of fragments in the roof and bottom slate layer. When the difference between ultrasonic wave velocities of coal seam specimens was not obvious, the impact velocity determined the concentrated distribution area of fragments. When the impact velocity was more than 6 m / s, the coal seam fragments were mainly concentrated in area II, and the rise range of cumulative mass percentage curve could reach 52%. When the impact velocity was less than 6 m / s, the fragments were mainly concentrated in Area III, and the rise range of the curve reached 61%. The research results were helpful to reveal the failure mechanism of coal and rock and enrich the theory of coal and rock dynamic disaster prevention and control.
孙晓元1,李吉辉1*,丁 浩2,金廷旭1,谢建林1,梁 磊1. 基于SHPB动载过程的煤岩冲击破坏特征试验研究[J]. 煤炭与化工, 2022, 45(8): 1-5.
Sun Xiaoyuan1, Li Jihui1*, Ding Hao2, Jin Tingxu1, Xie Jianlin1, Liang Lei1. Experimental study on impact failure characteristics of coal and rock based on SHPB dynamic load process. CCI, 2022, 45(8): 1-5.