# Stability Analysis of Roadway Groups under Multi-Mining Disturbances
## 4 Numerical Simulation of Deep Well Roadway Group Disturbance Effect
### Influence of Mining Disturbance at Working Faces  
During the advancing process of the working face in the test section, it is affected by the disturbance of working faces 01 and 10, which belong to the multi-disturbed roadway. The study of the law of influence on the surrounding rock of the roadway, during the mining process of the working face, is of great significance for determining the location of the stop line. The distribution law of stress field, displacement field, and plastic zone were simulated as the working face distances from the roadway of 50 m, 75 m, and 100 m.  
The vertical stress distribution of the surrounding rock of the model is shown in Figure 12.  
Figure 11: Distribution of plastic zone after roadway group excavation. Figure 10: Displacement of surrounding rock behind the excavation roadway group. As shown in Figure 12, mining has disturbance effects on the four main roadways. The disturbance effect of the track roadway and auxiliary transportation roadway is the most severe when the distance between the working face and the roadway is 50 m. The influence of mining on the disturbance of the track roadway and the auxiliary transportation roadway is reduced when the distance between the working face and the roadway increases. Thus, the impact of mining on the roadway group is minimal when the distance between the working face and the roadway is 100 m.  
The changes of maximum vertical stress is shown in Figure 13 for distances of 50 m, 75 m, and 100 m between the working face and the roadway. When the roadway group is excavated, the maximum vertical stress on both sides of the track roadway is 39.1 MPa. The maximum vertical stresses on the two sides of the auxiliary transportation roadway are 36.2 MPa and 36.7 MPa, respectively. The maximum vertical stress on both sides of the roadway is increased after mining the coal seam. When the distance between the working face and the roadway is from 50 m to 100 m, the maximum vertical stresses on the two sides of the track roadway and the auxiliary transportation roadway are gradually reduced. When the distance between the working face and the roadway is 100 m, the changing rate of the maximum vertical stress has the lowest value. The horizontal displacement distribution of the surrounding rock of the model roadway is shown in Figure 14.  
Figure 12: Vertical stress distribution of the different distances between working face and roadway: (**a**) 50 m, (**b**) 75 m, and (**c**) 100 m.  
As shown in Figure 14, when the distance between the working face and the roadway is 50 m, the four main roadways are affected by the disturbance of the mining. The track roadway and auxiliary transportation roadway have the largest deformation. When the distance is 75 m, the disturbance of the ventilation roadway and the belt conveyor roadway  
Figure 14: Vertical displacement diagram of different distances between working face and roadway: (**a**) 50 m, (**b**) 75 m, and (**c**) 100 m.  
Figure 13: Maximum vertical stress at different distances between working face and roadway: (**a**) the track roadway and (**b**) the auxiliary transportation roadway. is not obvious, and the deformation of the track roadway and auxiliary transportation roadway is relatively large. When the distance between is 100 m, the mining has no obvious disturbing effect on the ventilation roadway and the belt conveyor roadway, and the track roadway and auxiliary transportation roadway are slightly deformed. The maximum horizontal displacement changes are shown in Figure 15 when the distances between the working face and the roadway are 50 m, 75 m, and 100 m. When the roadway group is excavated, the maximum horizontal displacements of the two sides of the track roadway are 2.2 cm and 2.1 cm, respectively, and the maximum horizontal displacements of the two sides of the auxiliary transportation roadway are 2.6 cm and 2.61 cm, respectively. After the coal seam is mined, the deformation of both sides of the roadway increases.