The Defermation Failure Mechanismand Stability Analysis To The Interbedded Of Softand Hard Slope In The Train Vibration Loads

With the rapid development of our country's high-speed railway, southwest railway seized het western development great historical opportunity, the function is perfect for west rail network, for global power through constructing North-south transfixion,east-west accessibility, point-line coordination. railway development shows great vitality and vigor. Illimitable steep mountain, Eroding canyons, complex geological conditions, large proportion of bride tunnel of southwest railway administration, there are great diffult for project reconnaissance, design, construction, etc.Taking No.3 high-speed railway station pillars abutment of hard and soft interbedded slope of chongqing stelae in the study, the rocky slope engineering geological conditions the basic features and factors influencing slope stability were detailedly expounded. Hard stratum alternate with soft layer slope of eformation failure mechanism and stability were detailedly analysed in natural state and the train vibration load. Mainly made the following knowledge:1)Analysis problems of abutment of the slope from engineering geological of Terrain landform,Stratigraphic lithology,New tectonic activity and earthquake,Hydrogeology conditions,Bad geological conditions etc .2)Analysis the entirety slope from zone division characteristics, structure surface and assemblages, dangerous rock developmental characteristics etc.3)On the basis of the deformation and failure factors influenced slope, and slope deformation failure mode is induced into types of shear - sliding, and inducing the deformation and failure modes of dangerous rock into three types are dump,slumping and fall.4)Employing analysis of geological process mechanism and theory of limit equilibrium, Analysis and evaluate the stability of the dangerous rock and the abutment of entirety slope: dangerous rock in the condition of natural state and rainstorm is basically stability in currently,in the condition of rainstorm + earthquake is unstable; Entirety slope under various working conditions is unlikely losing its stability.5)By using 2-d discrete element in natural state software analyses different slope deformation and destruction features per hour, and concluded that : the train vibration load to the intervention of the slope, stress field and displacement field and the plastic damage area characteristic value have increased, when the speed of train has more than 250 Km/h, dynamic response characteristics has more apparent.6)Using the fast Lagrangian finite difference method (FLAC- 3D) to analysis the stress and strain characteristic with nature slope and the slope under the train vibration loads. Thereby ,obtain the stability results of this slope in both cases: In the natural state,the overall slope is unlikely losing instability. Only the unstable slopes crack block might happen collapse disasters. In the train vibration load, will influencing the stability of the slope.The slope won't happen a widly range of destruction, but it will accelerate the slopes of block caving unstable.