A Study on Treatment Scheme of Shallow Buried Deviation at Tunnel Entrance of Super-large Highway Tunnel
The surrounding rock of shallow buried biased section of super long-span highway tunnel is weak and broken.During the construction of tunnel entrance and exit,the excavation disturbance is large.The stress and deformation of surrounding rock are characterized by sudden and rapid change,which is easy to cause tunnel collapse and safety accidents.In order to ensure the stability and safety of shallow buried biased section of tunnel entrance,combined with the treatment experience of slope engineering,the sliding body of tunnel entrance was reinforced by the support system of micro pile group pile and surface steel flower pipe grouting,with improving the strength of surrounding rock and reducing the uneven settlement of the surface.When exiting the tunnel,the arch back pressure back-fill was applied and the biased retaining wall was set to balance the biased pressure.Taking the en-trance of Shenzhen Longgang end of Yuandun tunnel as an example,the above support system was a-dopted and the force analysis of the support system was carried out.Through numerical simulation combined with the field monitoring results,the relevant laws were found.It is proved that the rein-forcement system can effectively improve the shallow buried bias pressure of the tunnel.
slumping bodysuper-large spanshallow buried deviationstress distribution
万方数据
维普
