In Situ Testing of Rock Burst Damage to Roadway Wall Rock and Support System

Rock burst hazards are a common occurrence during deep coal mining, resulting in the collapse of roadway wall rock and the failure of support structures. In response, in situ testing was conducted in underground mine areas affected by rock burst disasters to systematically assess the impact of rock burst on wall rock of roadways and the performance of support systems. The findings of the study suggest that rock burst events lead to a substantial decrease in the strength of the coal mass of the roadway roof and ribs, as well as an increase in fractured zones. Additionally, there is a reduction in wave velocity, attenuation of anchoring and pretension forces of rock bolts, and varying degrees of damage to anchoring interfaces between rock bolts and their anchoring agents and between anchoring agents and wall rock. The parameters defining the mechanical and impact resistance properties of rock bolts and anchor cables, including extension rate and tensile strength, exhibit a significant decrease. In light of the aforementioned research results, it is recommended that the existing support system for roadways vulnerable to rock burst be enhanced and reconfigured in three key areas: improving support design, choosing materials with superior impact resistance capabilities, and bolstering monitoring and warning mechanisms.