Numerical Simulation Analysis of Construction Disturbance Effect of Large-section Coal Bunker Chamber

For the engineering practice of adding two large-section coal bunker chambers in Zhuxianzhuang coal mine, three-dimensional computational model of two large-section coal bunker chamber was established by the software FLAC^3D. The stress and displacement distribution of surrounding rock during the whole process of excavation and support of two coal bunker chambers were simulated and analyzed, and the disturbance influence of excavation construction of No.2 coal bunker chamber on the stress and deformation of surrounding rock of No.1 coal bunker after construction was discussed. The results show that stress concentration occurs at the upper and lower closures of No.1 coal bunker chamber, while the upper closures and the bunker appear larger displacement after the completion of No.1 coal bunker construction. The No.2 coal bunker underwent the construction process of excavation and combined support, has effect of unloading first and then constraint on the surrounding rock of No. 1 coal bunker chamber. The stress and displacement at the typical locations of No. 1 coal bunker chamber undergo fluctuation change of decreasing first and then increasing.