关键词: 深部巷道, 锚杆, 冲击载荷, 落锤冲击, 力学特性

Abstract: In order to study the dynamic mechanical properties of mining bolt under impact load, the commonly used bolt materials for rock burst roadway in Inner Mongolia Shaanxi mining area were selected. The static and dynamic mechanical properties of the bolt were tested using AW-1500 microcomputer controlled electro-hydraulic servo testing machine and drop hammer impact testing machine, and the bolt load displacement curve, impact force time history curve, displacement time history curve and other data were obtained. It is found that the time history curve of bolt impact force can be divided into three stages: sharp increase stage, stable stage and attenuation stage. With the increase of impact times or impact energy, the peak impact force of the bolt increases gradually, and the impact force of the bolt is stable between 200kN~300kN. When the bolt reaches the impact breaking point, the peak impact force is between 250kN~300kN. Under the impact load, the necking of the breaking position of the anchor rod is not obvious, showing obvious brittle fracture characteristics. The dynamic breaking load is slightly greater than its static breaking load, while the elongation is greatly reduced, and the elongation after fracture under dynamic load is about 10%. The research results can provide some experimental basis for the design and material selection of rockbolt support in rock burst roadway.