关键词: 孤岛煤柱, 静载荷集中, 爆破卸压, 补强支护

Abstract: The isolated coal body is affected by the pressure transfer of the overlying high roof in the surrounding goaf, and there is a high level of static load concentration, and the impact risk is significantly increased after the mining disturbance. Aiming at the high impact risk of an extra-thick isolated coal body roadway in a rockburst mine in Shandong, the engineering analogy method was applied to analyze, and it was concluded that the current size of the isolated coal pillar was not enough to isolate the influence of mining disturbance. The stress state around the isolated coal pillar in the large roadway is analyzed, and the results show that the optimal size of the isolated coal pillar in the main roadway should be more than 200m. The blasting pressure relief measures are designed to reduce the impact risk caused by the superposition of dynamic and static loads. At the same time, the reinforcement support measures are designed to improve the bearing capacity of the roadway. The on-site industrial test shows that the control effect is good, ensuring that the extra-thick isolated coal mass is large during the final mining period of the working face. Alley's scour safety.