# Evaluation Method for Rock Burst Hazards in Strip Filling of Working Faces in Deep Coal Mines
###### Abstract  
The impact risk evaluation for the strip filling of working faces has always been a research hotspot and a difficulty in the field of rock bursts. In this paper, the concept of the critical filling rate is first proposed, and the criterion for identifying the impact risk of the strip filling of a working face is established. Then, the membership function of coal body stress and the coal seam elastic energy index to impact risk was established, and the classification index of the impact risk grade was formed. On this basis, the overall and local evaluation method of the rock burst hazard for the strip filling of working faces was proposed. Finally, the C8301 working face of the Yunhe coal mine was taken as the engineering background, and the impact risk evaluation was carried out. It was found that the overall risk of the C8301 working face was determined as a strong impact risk, and there were six local risk areas, which included two weak impact risk areas, two medium impact risk areas, and two strong impact risk areas. This study can provide guidance and a reference for the impact risk evaluation of strip-filling mining under the same or similar conditions. Keywords:strip filling of a working face; impact risk; identification criteria; membership function; case investigation +
Footnote †: journal: Medical  
revealed the mechanism of a rock burst around the separation zone of the key stratum of deep strip mining through the investigation and analysis of multiple rock burst accidents that occurred in strip mining. The mechanical model of key stratum separation was established, and the main reasons for the significant increase in the stress concentration caused by the transfer of the load above the critical layer to the surrounding area of the key stratum separation zone were pointed out. [PERSON] et al. [14] studied the rock burst mechanism of the hard roof face of the mining of a large mining depth strip. They proposed that the rock burst of the strip face is closely related to the nature of coal rock, the depth of mining, the thickness of the hard roof, and the periodic pressure of the roof. They also proposed prediction and forecasting methods, such as the drill cuttings method and prevention and control measures for coal-blasting pressure relief and flexible support. [PERSON] et al. [15] pointed out that the enrichment rate is the key to controlling surface settlement and preventing rock bursts. Four ultra-high-water goat-filling and mining technologies were proposed, which included open, bag, hybrid, and segmented barriers. These technologies were successfully applied in the goat under two different conditions: the thin coal seam of the Tianzhuang Mine and the thick coal seam of the Taoyi Mine. [PERSON] et al. [16] carried out discrete element numerical simulation of the caving method and filling method of giant thick magmatic rock, and the control effect of filling mining on magmatic rock migration and mining stress was analyzed. [PERSON] et al. [17] analyzed the relationship between the stress distribution characteristics of the working face of a thin coal seam and the mining height through numerical simulation and found that the stress drop of the coal body in front of the thin coal seam and the elastic deformation energy released per unit volume of the coal body were greater than those released by the thick coal seam. It was easy to induce a rock burst of the thin coal seam under the influence of a dynamic load. [PERSON] et al. [18; 19] studied the influence of gangue in the goat on the mechanical state of the surrounding rock in longwall mining face via numerical simulation and constructed a geomechanical evaluation model. Most of the above studies focused on the study of filling material components, the optimization of the filling process, and the control of the filling effect on the fracture of thick hard-rock layers and surface subsidence.