Analysis of the Influence of Rectangular Tunnel Excavation on the Stability of Surrounding Rock
In order to study the influence of rectangular tunnel excavation on the stability of surrounding rock,based on the actual data of Papaya Coal Mine,a numerical calculation model was established using FLAC3D to investigate the influence of different lateral pressure coefficients on the stability of surrounding rock in rectangular tunnels.The results show that as the excavation depth increases,the principal stress difference between the top and bottom plates first increases and then tends to stabilize,while the rate of increase of the principal stress difference at the two sides shows a slow first,then rapid increase,and finally stable trend.Excavation has the greatest impact on the surrounding rock within a range of 0～5 meters from the working face,and is also the most prone to plastic zones.As the excavation depth increases,the surrounding rock of the roadway undergoes varying degrees of shear failure,and the roof and roof experience varying degrees of tensile failure.As the lateral pressure coefficient increases,excavation has the greatest impact on the top plate of the roadway,followed by the bottom plate,and the smallest impact on the two sides.Among them,as the excavation depth increases,the surrounding rock of the two sides first fails at a distance of 0～1 m from the inner wall of the roadway.
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