Research On Stability Of Weak Intercalated Surrounding Rock And Stress On Supporting Structure Of Tennel

With the rapid development of highways, the tunnel is becoming increasingly important. How to overcome a variety of geological disasters, has become the subject of growing concern.This article mainly study the weak interlayer,which likely to cause geological disasters on the rock of the tunnel.In this paper, taking Yunzhongshan tunnel on Xinzhou-Baode highway which in Shanxi pronvence as background, for Tunnel with weak interlayer, the use of on-site monitoring and measuring, numerical simulation and theoretical calculation of sever- al different research methods, soft interlayer with the stability of surrounding rock and by the support structure force characteristics were more detailed analysis, drawn some practical value and significance of the conclusions the effectiveness of this method was proved by e- ngineering practice. This thesis work includes the following aspects:(1) Of tunnel construction, tunnel excavation at the site after each displacement, the force supporting structure to monitor and conduct a comparative analysis on the basis of the monitoring, evaluation of the stability of surrounding rock, containing a preliminary study weak interlayer tunnel support bridge.(2) Experience of using the existing formula for calculating the pressure of surrounding rock, the rock with weak interlayer and without the pressure of the surrounding rock soft interlayer are calculated, and the surrounding rock and the actual pressure monitoring are compared and analyzed with weak interlayer free soft rock and the pressure difference between dissection, and dissection in the calculation of rock pressure with weak empirical formula gives the proposal.(3) The using of plane finite element method, a particular soft interlayer at the point of view, given the length and width, and position relative to the tunnel is not the same time several situations were discussed, detailed analysis of the rock's displacement, the main stress of surrounding rock, and the supporting structure of the forces, revealing the stability of surrounding soft strata on the impact of the tunnel. And the simulation results of the analysis and monitoring results were analyzed and compared.At the end this paper obtained some useful and conclusions of law.(4) Tunnel stability analysis based on the "guiding principle shear stress", and Repin's Including Soft Rock Rock tunnel determination of instability conditions [49], the weak interlayer position relative to the tunnel is not the same soft interlayer The stability of the judge.