Numerical Simulation And Actual Measurement Analysis On Surrounding Rock Stability Of Ingate In Deep Vertical Mine With Heavy Section

Ingate refers to connected part of the shaft with the pit bottom tunnel, is the throat part of the mine, large cross-section design and long service life, and the stress state is very complicated. In particular for the mine mining depth increasing, the stability of the ingate part for the stability of the surrounding rock of the system of the deep vertical shaft connection cavern groups is particularly important. Based on the theoretical analysis, numerical simulation technology, supporting structure parameter optimization and actual monitoring methods, such as the stability of the surrounding rock of the horse gate was carried out of research, such as the stability influence factors of the surrounding rock, the instability mechanism, the stability of the surrounding rock of the horse head door under different structure parameters, optimization design of supporting parameters and results contrast of numerical simulation with field monitoring. Study the stability of the surrounding rock of the ingate in deep vertical shaft, natural engineering geological factors, tunnel cavern itself structure characteristics and factitious factors in the process of construction, etc. should be taken together. Combination of the actual geological conditions of the deep downcast wind shaft ingate in Pansan coal mine of Huainan mining Ref-co Group Ltd, to 3-d numerical simulation by using numerical simulation software HyperMesh, ABAQUS for the ingate part, mainly analyzed the stability condition of the ingate tunnel and the surrounding rock of the shaft in the different in-situ stress load, shaft diameter and height of horse head door, well reveals the displacement and stress change rule of the ingate tunnel and the surrounding rock of the shaft. Based on the numerical calculation results of the analysis of the surrounding rock stress characteristics of ingate and connecting cavern in Pansan deep air shaft, combined with field engineering experience, proposed that supporting parameter optimization design plan, and design that increased length 14m anchor beam to control top surrounding rock stability in ingate vault. Through numerical simulation analysis and practical monitoring results, found that 15m to 20m distances from the center of the tunnel the stability of the ingate tunnel and the surrounding rock of the shaft affected significantly by excavation and should be adopted to strengthen supporting technology for support. The ingate part appeared a compressive stress concentration phenomenon under different structure parameters, should be consider to use the means of support, such as surrounding rock grouting and add anchor cable to ensure the stability of surrounding rock; Ingate tunnel baseboard made a significant floor drum up phenomenon, should be the implementation of baseboard bolt grouting, baseboard anchor cable and the inverted arch supporting technology to control the floor drum up phenomenon in the bottom of the ingate.