## 3 Analysis of Simulation Results
### Data Analysis of Surface-Surrounding Rock Deformation  
The monitoring points arranged on the surface of the model were observed by photogrammetry, the coordinate data of the monitoring points of the model were extracted, and the position change of the monitoring points of the roadway surrounding rock under the surrounding rock stress of 4 and 15 MPa was drawn in combination with the Origin analysis-drawing software, as shown in Figure 5.  
Figure 5 shows that the deformation and failure of the roadway-surrounding rock were obviously non-uniform, and the roof and the lower side of the roadway were greatly deformed, while the deformation in the floor of the roadway was still small. The deformation of the roadway floor showed that the displacement near the center point in the floor was the largest, and the displacement on both sides was small. The deformation of the high and low sides of the roadway showed that the displacement of the high sides was small and the integrity was better. In the low-top upper area where the low-top zone and the roof intersected, the displacement of the tangent position between the roadway surface and the rock formation was the largest, and there was an obvious interlayer separation. Continuous observation of the multipoint displacement meter can help obtain the displacement data of the monitoring points inside the surrounding rock under the stress of the roadway-surrounding rock. The multipoint displacement meter reading value of the roadway-surrounding rock (Figure 6) shows that with the increase of the roadway surrounding rock stress, the displacement of the monitoring points in the surrounding rock of the model roadway had the following characteristics: The surrounding rock of the roadway was displaced towards the center of the roadway, and the displacement of the surrounding rock to the center of the roadway increased gradually with the increase of the surrounding rock stress of the roadway. As the distance from the roadway surface increased, the displacement of the surrounding rock to the roadway center decreased gradually. The surface displacement of the right upper zone was the largest. With the increase of the surrounding rock stress of the roadway, it reached 16 mm. When the surrounding rock stress was lower than 10 MPa, the displacement growth rate was slow, and the displacement growth rate was faster with the increase of surrounding rock stress. As the distance from the roadway surface increased, the displacement of the surrounding rock to the center of the roadway gradually decreased, and the maximum displacement of the No. 4 point on the right upper zonewas 10 mm. The surface displacement of the left upper zone reached 12 mm. When the surrounding rock  
Figure 5: Comparison of position changes of monitoring points. stress was lower than 9.5 MPa, the displacement growth rate was slow. With the increase of the surrounding rock stress, the displacement growth rate was faster. As the distance from the roadway surface increased, the maximum displacement of point 4 on the left upper was 5 mm. The surface displacement of the left bottom corner is 15 mm, and the surface displacement larger than the right bottom corner is 9 mm. The figure also shows that the displacement of point 4 near the outer boundary of the model was smaller than that of point 3. As the distance from the roadway surface increased, the displacement of the surrounding rock to the center of the roadway gradually decreased, mainly because of the loading around the model. The displacement of the surrounding rock of the high gangway was only 1/2 of that of the low gangway, and the displacement of the roof and floor was the same. From the perspective of deformation characteristics, the displacement of the upper of the right side and the lower of the left side of the roadway was large, and the displacement of the upper of the left side and the lower of the right side was small.