Dynamic Stability Characteristics And Its Vector Sum Analysis Method Of Rock Slope Under Strong Earthquake Loading

Our country is a mountainous country, rock high slope problem has always beenone of the hot spots of geotechnical engineering in China, especially the problems ofthe stability of slope under earthquake action which the current geotechnicalearthquake engineering and earthquake engineering research pay much attention. Alarge number of earthquake damage investigation results indicate that the earthquakeinduced sliding slope unstability is one of the main types of seismic geologicaldisaster. Ground motion under the action of instability and failure of slope caused bythe gravity of the disaster is closely related to the unique natural geographicalenvironment, and more to do with human is closely related to the economicdevelopment, distribution and engineering layout. A large number of engineeringactivities will reduce the existing natural state of slope stability, at the same time willincrease a lot of new artificial slope, the slope stability, is directly related to the safetyof the project itself.Based on analysis of stability against sliding of the limit equilibrium method andfinite element strength subtraction is established on the basis of strength reductionprinciple, adopt the potential sliding body according to the current actual bearingmaterial performance to judge the stability of the state and the actual state andcalculate anti-sliding stability safety coefficient vector and analysis method for slopestability analysis. First of all the factors influencing the stability of the high and steeprocky slope was analyzed, and expounds the seismic action of high and steep rockyslope instability induced effect. Then based on the western region of China in recent years several large slope caused by the earthquake disaster, summarizing theinstability and failure of rock slope and soil slope type and damage forms.On thisbasis, based on high and steep rock slope engineering, the dynamic stability againstsliding of theoretical analysis, numerical simulation and engineering application, theresearch of dynamic stability against sliding analysis method, and rock slopediscontinuity numerical simulation analysis of key issues in research, dynamic safetycriterion of stability against sliding.In view of the high and steep rocky slope under earthquake typical failure mode,the establishment of simplified model of the discontinuous rock slope. By the finiteelement dynamic calculation, considering the Wenchuan earthquake records, waverake, simulation of strong vibration discontinuous high and steep rocky slope underthe action of dynamic response, analysis of the slope acceleration, displacement andstress state. Points out that the high and steep rocky slope under the strong shockacceleration amplification along the airport surface slope and slope surface, itsmagnification present nonlinear distribution along the airport surface. Based on thedynamic characteristics of the slope is put forward, and a method for determining thepotential sliding surface and identify potential sliding surface of slope under theaction of earthquake force. Uses the power vector and the method to calculate theslope dynamic safety factor and dynamic downward trend, evaluation of the slopedynamic stability. The first scenic spot Nanjing slope engineering, vector and dynamicanalysis method for the engineering application, combining with the calculationresults reinforcement scheme is put forward, and the reinforcement effect is verified.Vector and dynamic analysis results show that the method can solve rock high slopeengineering in power sliding resistance caused by the defective geological problemand provide the optimization design for high rocky slope with advanced theory andmodern means.This paper is supported by The National Basic Research Program of China(2011CB13505).