Study On The Creep Mechanism And Stability Drop Prediction Of Slope

Under the action of every kind of geological force, the geometrical and the hydrology geology characteristics of the slope will constantly take place the variety with time. Therefore, the slope has being in change of deformation and change of the stability. The deformation of slope along with time and the stability drop process are generally called creep deformation. The development of creep deformation may eventually cause the slope failure. At the present day the analysis of slope stability usually adopts the limit equilibrium principle, using the ratio of slide force and anti-slide force on the slide surface to evaluate slope stability safety. This kind of stability analysis method can obtain the coefficient of slope stability safety, but can't consider the coefficient of slope stability safety reduction with time due to the geomass creep deformation. Engineering examples indicate that the slope deformation increments with time and the coefficient of slope stability safety constantly reduce with the variety of slope deformation. This shows to study the slope creep behavior and represented characteristics and find the slope creep model for the anticipation of the slope stability safety reduction with time have important signification in actual engineering. Based on existing creep theory and geotechnical model, this paper apply the slope stability study through the model analysis and compare to slope engineering, the results presents that Bingham-Kelvin model can effectively model the creep behavior of slope under low normal stress and the slope elastic deformation, primary creep deformation and secondary creep deformation; Through out the combination of Patton rock strength rule together with Bingham-Kelvin model, we may anticipate that the shear rigidity of rock and soil reduce with time and the coefficient of slope stability safety reduce with time by the results of the slope displacement observation, where provide a effective way for the forecast of slope stability safety. This paper further adopts PLAXIS to analyze slope creep failure behavior, slope creep process and the rule of the coefficient of slope stability safety, the numerical results indicate the analyzed slope creep behavior is similar to the creep characteristic of rock and soil. The displacement of the slope appears the invariable creep phase after the instantaneous elastic deformation and in the end appears the accelerated creep phase and the displacement is not convergence. Finally, this paper put forward the strength -deformation creep control theory to evaluate the stability of slope at a long period of time, that is to evaluate the slope stability not only to need the traditional strength equilibrium analysis principle, but also to join the time factor of slope deformation for evaluating and predicting the possibility of slope failure.