Displacement Criterion Method Of Tunnel Stability And Control Strategy Research In Soft Rock

With the vigorous development of national transportation, encounter inevitablythe tunnels of poor geological conditions, deformation and to ensure the stability ofthe tunnels is the key of construction. Because the stability of the working face is aimportant aspect of the stability of the tunnels, the stability of the working face is akey object about the stability of the tunnels. By the most developed ANSYS FEMsoftware, the method is divided into two depths, and two steps excavation andfull-face excavation, and various combinations with supporting or not. Then tunnelmodels of four levels of surrounding rocks are analyzed, and the relationship isreached between the support forms and. tunnel face extrusion deformations.This paper proposes the catastrophe theory which can determine the stability ofthe tunnels face by studying tunnel face extrusion deformations. According to thistheory, study the influence of tunnel face extrusion deformations which is caused bytunnel advance reinforcement. The influence is analyzed by increasing the rockexcavation parameters of methods. Then some conclusions can be drawn. At the samedepth, the lower the rock parameters is, the earlier timing of the catastrophe is. Stepexcavation is able to play an inhibitory effect tunnel face displacement play aninhibitory effect. Hope that these findings can provide the theoretical guidance forfuture similar projects.