Rheology Analysis Of Tunnel Sorrounding Rock And Stability Of Zunyi Yang Jiao Nao

As an important part of the railway and highway network,the stabiility and safety of thetunnel are closely related to the long-term stability of the rock mass.Under the action of long term stress,the rock will produce a catain degree of rheological deformation,which will affect the stability and safety of the tunnel.Rock rheology is an important means to delemine the long-term strength of rock and the rheological properties of surrounding rock,the Zunyi Yang Jiao Nao tunnel as the research object,thnough laboratory experiment,theoretical anglysis and nurnerical simulation methods on the rhological properties of limestone were studied.The main research work of this paper includes the following aspects:(1)The three axis rheological experiment on Zunyi yang Jiao Nao limestone tunnel.The rheological properties of limestone were analyzed by RLW-2000 microcomputer controlled three axis rheology experimental machine.The rheological parameters of limestone were obtained.The rheological parameters of limestone and Burgers constitutive model were fitted to get the rheological parameters of rock;(2)The numerical simulation of the three axis rheological experiment is camied out by using the rheological parameters obtained.,and the displacement curves obtained by the experiment and the simulation are compared,and the results are basically consistent,thus the basic parameters of the rheology are detemined;(3)The Yang Jiao Nao Zunyi tunnel,the numerical simulation of tunnel excavation,respectively analyzes the influenee of tunnel CRD and steps excavation method for the stability of the tunnel;The parameters obtained by experiment and determine the constitutive elation is applied to Yang Jiao Nao tunnel in Zunyi,predicted ten years and twenty years'tunnel deformation and rheological changes of nao.A reasonable proposal for the project is provided.The rheological characteristics of Zunyi city based on Yang Jiao Nao express through numerical,theoretical analysis and computer simulation,experimental analysis,ten years,twenty years of the tunnel deformation characteristics,evaluation of the tunnel stability,has a certain theoretical significance and practical application value for the research of tunnel.