Study On Static And Dynamic Stability Of Complicated High Rock Slope And Time Series Analysis Of Deep Displacement

Landslide threat to human life is the greatest natural disasters. With the rapid development of economic construction, our country faces large-scale, the large number of unprecedented large and complex geological conditions of high rock slope problem. Slope instability (in particular dynamic instability) is a serious problem in China's economic development, threatening people's lives and property. Therefore, slope particular high rock slope stability analysis in a scientific and reasonable way is very important. As the complexity of the problem of stability, slope static and dynamic stability analysis are still many issues have not been solved.In this paper, taking a open-pit mine slope as engineering background, analyze in detail slope stability by several calculation methods. And calculate the slope of static and dynamic stability using limit equilibrium method, finite element strength reduction, finite-infinite element 3 methods, combined with on-site deep slope displacement monitoring results to establish a deep displacement of deformation time series forecasting model. Made the following research results:(1) From rock constitutive model and yield criterion, mechanical calculation foundation of slope stability and elastic-plastic finite element are discussed. And laboratory and field tests of the slope are conducted to obtain geotechnical parameters values. The results are the main parameters for calculation of slope stability.(2) Several simplified computation of limit equilibrium method and application conditions are discussed, and three kinds of simplified methods are used for slope stability calculation. Limit equilibrium slope stability analysis results are obtained.(3) Based on the basic principle of finite element strength reduction, comparing analysis of previous work, sum up applicability of plastic zone link, calculation convergence and displacement mutation for strength reduction finite element instability criterion. And safety factors of of slope by 3 kinds of instability criterion are calculated .(4) Combining basic principles of infinite element and finite element dynamic theory, applicability and stability for reconciliation of infinite element boundary are confirmed by computing sample slope. In the country, infinite element method is applied to the analysis of dynamic stability of slope earlier. And using ABAQUS software platform, finite-infinite element coupling calculation model of the slope is built to earthquake stability calculation.(5) Under horizontal and vertical earthquake effect, slope displacement, velocity and acceleration in plastic zone with elevation increase are not simple increasing relationship, while variety factors are associated with. Slope displacement, velocity and acceleration inelastic region of the rock mass increase with the elevation increase.The "vertical amplification" phenomenon is observed. Velocity and acceleration in the slope with elevation increases from time to time, increase and decrease. A number of extreme value trap are formated formed, while maximum and minimum values alternate appear.(6) Through engineering calculation shows that dynamic safety factor of slope with seismic time-process is changing. The safety factor Obtained according to the principle of minimum safety factor will be too conservative at some point become, and safety factor in accordance with the principles of equal area is appropriate.(7) Deep displacement prediction model based on autoregressive moving average (ARMA) is established using high rock slope d deep isplacement monitoring data. The measured results and the achievement of sequence model to predict the results show that: The ARMA model forecasting deep displacement slope is appropriate, to better approximate the original physical system. ARMA (4, 3) model can better predict the deep slope displacement for this particular high rock slope deep displacement. Current monitoring data and model projections indicate that deep displacement is smooth and the current slope is stable.By this study, an initial theoretical system of a high rock slope stability analysis have been established, particularly dynamic stability analysis. This work helps to enhance those types of slope stability analysis. A certain basis of theory and practice for those types of slope stability analysis have been laid.