Stability Analysis And Mechanical Response For The Surrounding Rock And Supporting In Guanshan Tunnel

In the tunnel excavation process, it will affect on the stability of surrounding rock。If the retaining structure is improper, that will cause great harm to the stability of surrounding rock, Even the Rock burst。The retaining structure generally includes shotcrete, anchor, anchor supporting and so on, for the different support structure to selection problem, This article to Guanshan tunnel project as background, Using finite difference FLAC3D software to simulation GuanShan tunnel shotcrete、bolt、steel arch、anchor of four different support surrounding rock displacement field, stress field change of state, and the results were analyzed, by bolting effect best, concrete support to surrounding rock pressure stress concentration to ease effect of bolt, is mainly on the tensile stress attenuation.Through the simulation of bolting under the different stress release rate of displacement field of surrounding rocks of changing state of the stress release rate larger supporting structure plays the role of the smaller, namely the earlier support more can play a supporting structure effect.On site monitoring measurement vault subsidence displacement value and the arch convergent value, the data statistics obtained displacement variation and change rate; regression analysis of monitoring data, improved due to the measured data of discrete, better get the displacement law.On the monitoring results of regression analysis and numerical simulation results were analyzed, verified the feasibility of several analytical methods. On the design of tunnel support construction has certain direct sense, for the future similar engineering design, construction and provide reference.