Research on the prevention and manage of rockburst in deep‐seam mining roadways

• Published in: Energy science & engineering 2024-10, Vol.12 (10), p.4260-4277
• Main Authors: Huang, Wanpeng, Zhao, Tongyang, Jiang, Donghai, Liu, Yaxin, Wang, Xukui, Xin, Guangming
• Format: Article
• Language: English
• Subjects: Buried structures; Coal mining; Compressive strength; Digital transmission; Energy; Energy absorption; Energy methods; Fault lines; Geological structures; Geology; large‐buried depth; Machinery; microseismic monitoring; Mines; Prevention; Pull out tests; rockburst; Rockbursts; Strain analysis; Support systems; Tectonics; thick coal seam; Work face
• ISSN: 2050-0505; 2050-0505
• DOI: 10.1002/ese3.1877

This study presents a strategy for preventing and controlling rockbursts in deep and vast seams during the mining operation. We analyzed the main factors influencing rockburst by combining the geological structure of the rock mass with field‐collected microseismic monitoring data. Determined the disturbance strain sensitive threshold through mechanical experiments on coal's antidisturbance characteristics, the indoor pull‐out test of the supporting bolt was carried out. Studied the rockburst support technology and the antirockburst capability of the support system based on the energy method. The key governing variables of regional impact risk in the big buried deep coal seam operating face include high tectonic stress, goaf effect, fault, and fault protection coal pillar. The uniaxial compressive strength of the coal sample in the 3308 working face is 15.11 MPa, the antidisturbance strength is 10 MPa. When the extreme stress is 86.03%, the specimen fails; the ultimate failure strength under disturbance is 13 MPa. The support system's antishock ability is analyzed based on its energy absorption, under the premise of ensuring the support quality and support strength, the antiscour ability of 3308 Tailentry support meets the anti‐impact requirements. It is believed that the system offers adequate lateral confining pressure for the internal creep disturbance‐sensitive area, enhancing the area's resistance to disturbance. This is crucial in preventing and managing rockburst incidents. In this paper, based on the research background of the thick coal seam rock mass in a deeply buried coal mine, combined with the geological structure of the rock mass and collecting the microseismic monitoring data on the spot, the main controlling factors of rockburst are analyzed and the disturbance strain sensitive threshold is determined by a mechanical experiment on the antishock property of coal. A prevention and control method suitable for rockburst in large‐buried deep coal seam is introduced, based on the energy method, the rockburst support technology and the antirockburst capability of the support system are studied, and the antidisturbance mechanism of the surrounding rock after the roadway support is studied, to avoid a rockburst disaster.