Numerical Simulation Analysis of the Stability of Large Cross-section Y-arched Roadway Crossing Point

Considering the issues of surrounding rock stability control of Y-shaped crossing point, the article uses FLAC^3D software S-B modeling method to carry out numerical simulation analysis of influence factors including different crossing angle, buried depth, rock strength, coefficient of lateral pressure and excavation sequence. The results show that the influence of buried depth and intensity of surrounding rock, excavation sequence has more significant impact on the cross-point compared with the coefficient of lateral pressure and crossing point angle. The influence of buried depth and rock strength on the stability of crossing point exists in an inflection point. When the parameter is greater than the inflection point, the roadway will has a greater damage. The influence of coefficient of lateral pressure on crossing point is mainly reflected in the plastic zone size of the crossing point, although there is no law, fluctuation range is little.