The Study Of Stability Evaluation Of Surrounding Rock Mass Of The Dongchuan River's Tunnel In Jinduicheng

In this thesis, the author studies surrounding rock mass stability of the Dongchuan River's water tunnel in jinduicheng, accompany with site investigation and site in jinduicheng, the author does his study, witch consists of seven parts:(1) Transit process of rock stress field of research region;(2) The research of the reasons for the stability of this tunnel and the research of the types, mechanisms deformation and failure of surrounding rock mass, there are three basecial deformation and failure types of the surrounding rock mass, which are falling, arch collapse and side slide types, there are four types of rock mass structure in tunnel ,they are block, beded, cataclastic and scattered structure relatively;(3) The classification of rock mass is carried out according to the classification system In the Hydroelectric Standard of P.R.C and the system of "BQ", and then we can know the classification of rock mass is IV or V;(4) The stability evaluation of surrounding rock mass is stimulated by 2D FEM, use the 2D-σ to stimulate the tress, strain and the level of deformation of this tunnel;(5) We use the 2D DEM to stimulate the process of the failure in this Tunnel, use the 2D-Block to stimulate this tunnel, we can know the falling of the arch is the most important deformation;(6)Put forward the measure of the supporting to this tunnel.