Research on optimization of coal roadway support parameters and equipment technology in Tianshuibao Coal Mine

Currently, research on rapid excavation technology mainly focuses on the influencing factors and equipment optimization of rapid excavation. There is relatively little research on the joint optimization of roadway empty roof distance, support parameters, and construction technology. In order to solve the above problem, the study focuses on the return air roadway of the 1309 working face in the No.2 of Tianshuibao Coal Mine in Huanxian County, Gansu Province. The study investigates the optimization methods of coal roadway support parameters and equipment technology. The study analyzes the time features of each process of roadway excavation. It is found that excavation, permanent support, and temporary support take the most time, accounting for 25.3%, 49.9%, and 6.2% respectively. Focusing on the three most time-consuming processes as the optimization direction, a mechanical model of the roof in the goaf area of the excavation face is constructed. The theoretical maximum empty roof distance of the excavation face is obtained to be 2.32 meters. Considering the influence of equipment, geology, technology and other factors on site, the empty roof distance is determined to be 2.0 meters. Based on the distribution features of stress, deformation, and plastic zone in the surrounding rock of the roadway under different support schemes, combined with the efficient excavation requirements of the roadway, the optimal spacing between anchor rods is determined to be 800 mm × 1000 mm. Based on the actual geological conditions of the roadway, the excavation equipment, temporary support technology, and construction technology are optimized and matched. The on-site test results show that after optimization, the maximum daily footage has been increased from 8 meters to 10 meters, and the roadway excavation speed has been increased by 25%. The deformation of the surrounding rock in the roadway is basically in a stable state, with a maximum deformation of 226 mm. The optimization plan not only ensures the safety and stability of the roadway, but also significantly improves the excavation speed of the roadway.