Study on the Outburst Scheme of a Shallow Buried Bias Tunnel in Yunnan

Improper construction of the tunnel entrance is likely to cause collapse and affect construction safety and damage the ecological environment. Aiming at the poor stability of surrounding rock at the exit position of Xiaoguanzhuang tunnel, on the basis of investigating the geology and driving scheme near the tunnel, the asymmetric distribution of axial force of cross-section structure under shallow eccentric pressure is obtained through numerical simulation, and the maximum axial force is applied at the left arch waist and right arch foot. According to the analysis results, the surrounding rock should be reinforced in time, and the import section should be dealt with in the design stage to ensure construction safety and efficiency, and provide reference for future construction.