## 6 Conclusions  
This paper takes the deformation and failure of surrounding rock of the main inclined shaft in Yuxi Coal Mine as the engineering background and uses Midas GTX NX to complete the 1:1 engineering modeling. Then, the explicit finite difference program (FLAC3D) is used for numerical calculation of the model, and the simulation results are analyzed in detail. The following conclusions can be drawn:  
(1) With the increase of buried depth, coal and rock mass induce different degrees of movement, so that the deformation variable of the roadway increases with the increase of the buried depth. The surrounding rock stress of the main inclined shaft decreases under the influence of excavation disturbance. For monitoring area X (10, 12), after the excavation of the electromechanical chamber, the vertical principal stress of the roadway floor decreases from 1.8232 \(\times\) 10\({}^{5}\) Pa to 8.7118 \(\times\) 10\({}^{4}\) Pa; after excavating the head chamber of the belt roadway, the change value is reduced from 8.7118 \(\times\) 10\({}^{4}\) Pa to 6.8863 \(\times\) 10\({}^{4}\) Pa. The coal and rock mass in the bottom plate of main inclined shaft moves to free space under the combined action of unstable vertical stress and shear stress, resulting in the occurrence of floor heave.  
(2) The displacement evolution laws of different areas of the main inclined shaft are different after being disturbed by excavation. The maximum displacement of the bottom plate in the monitoring area X (67, 69) is sensitive to the excavation disturbance and is most affected by the excavation disturbance. The maximum displacement of the floor of the excavation electromechanical chamber and the head chamber of the belt roadway increased from 0.35468 m to 0.64301 m and 0.65934 m, respectively, nearly doubling. At that time, a large area of surrounding rock deformation occurs in the main inclined shaft roadway, and the bottom heave is the main phenomenon.  
(3) Under the influence of the excavation disturbance, the scope of the inclined shaft bottom heave after excavating the machine head chamber tends to increase. The maximum floor deformation can reach 1.06 M, exceeding the limit of 1 m. The fluctuation range is wide, which will seriously restrict the production efficiency of coal mine. The serious deformation and failure area of the main inclined shaft mainly occurs near the intersection of the falling position. The main causes are the deterioration of the surrounding rock fragmentation and the bottom heave caused by tensile stress. The damage to the main inclined shaft can be reduced by grouting reinforcement at this position and the cooperative support of a floor anchor cable.  
Conceptualization, Y.Q. and H.X.; Data curation, F.W., H.X. and F.Z.; Investigation, F.W., H.X., F.Z. and X.C.; Methodology, F.W.; Project administration, Y.Q.; Resources, F.W.; Supervision, Y.Q.; Visualization, Y.Q., H.X., F.Z. and X.C.; Writing--Original draft, F.W.; Writing--Review & editing, H.X. All authors have read and agreed to the published version of the manuscript.  
This research was funded by [National Natural Science Foundation of China] grant number [51874315; 52074303] and [Fundamental Research Funds for the Central Universities] grant number [2021 YSAQ24].  
Not applicable.  
The authors declare no conflict of interest.