Dynamic damage characteristics and control mechanism of rocks anchored by constant resistance and energy absorption material

With resource exploitation and engineering construction gradually going deeper, the surrounding rock dynamic disaster becomes frequent and violent. The anchorage support is a common control method of surrounding rock in underground engineering. To study the dynamic damage characteristics of anchored rock and the energy absorption control mechanism of dynamic disasters, a new type of constant resistance and energy absorption (CREA) material with high strength, high elongation and high energy absorption characteristics is developed. A contrast test of rockbursts in anchored rock with different support materials is conducted. The test results show that the surface damage rates and energy release degree of anchored rock with common bolt (CB) and CREA are lower than those of unanchored rock, respectively. The total energy, average energy and maximum energy released by CREA anchored rock are 30.9%, 94.3% and 84.4% lower than those of CB anchored rock. Compared with unanchored rock, the rockburst peak stress in the CREA anchored rock is increased by 39.9%, and the rockburst time is delayed by 53.2%. Based on the rockburst energy calculation model, the evolution law of rockburst peak stress and energy release is investigated. The control mechanism of CREA support units on rock dynamic failure is clarified.