Research On The Slope Dynamic Response Characteristics Of Numerical Simulation

With Chinese industrial reform, low consumption, high utilization of the energyindustry strategic thought deeply in the field of each resource, especially in the miningindustry. Comprehensive, balanced and sustainable development concept for the miningindustry to overcome difficulties, to all optional mining must be scientific and efficientutilization of resources. At the same time to pay attention to the protection of the naturalenvironment and personal safety, is adding to the mining technology of the "burden",highlights the importance of safe mining.In open pit mining, for example, due to the economic interests of the driven, high andsteep open pit slope tends gradually. In the smallest range to obtain the biggest miningresources, forcing mining technology innovation, production difficulty increasing, and theslope instability coefficient was also improved. Together with the application of modernblasting mining technology and the effect of dynamic load, such as natural earthquakemore big coefficient of high steep slope instability, studied the response of the slope underdynamic loading, are becoming more and more important. Traditional slope stabilityanalysis method only select two static state analysis, no real implementation on theresearch of the dynamic loading process, although has certain reference significance to theactual production, but always there. Based on three dimensional explicit finite differencecalculation of FLAC3D numerical analysis software, for the analysis of dynamic loadfunction provides a new means.Paper analyzed the effect of dynamic load firstly, to understand the occurrence andthe mechanism of dynamic load. Found that dynamic load is the essence of the earthquake,such as artificial blasting vibration caused by shock wave on the slope, slope caused byinside and outside the particle vibration phenomenon. To study the different characteristicsof vibration wave propagation characteristics and dynamic role at the same time, combinedwith dynamic analysis function of FLAC3D, principle and the solving method of numerical simulation is given.Second, the numerical model is set up on the double the open-pit mine slope, dividedaccording to requirements of the vibration wave frequency and calculation model of thegrid. And selection of the driven load to the input method, boundary setting, the selectionof internal damping discusses the factors that influence the numerical simulation to selectthe reasonable parameters, working condition of points on the measured vibration wavesignal FLAC3D numerical simulation, obtained the best simulation effect.At last, through real-time monitoring, recording vibration response values at differentpositions of the slope, the slope under the condition of dynamic load and dynamic responserule was summarized. Found that the dynamic load under the action of stress and strain ofthe slope, mechanical parameters of rock mass, the size on the strength of the force aresignificant influence; Under different excitations, amplitude, frequency, the slope dynamicresponse of the acceleration, velocity and displacement showed different degrees of change,such as present certain regularity. In order to further demonstrate the validity of these rules,combined with the actual engineering application, contrast of slope stability coefficientunder different analysis method, proves that the use of FLAC3D numerical simulationanalysis of dynamic problems of reliability, as well as presplit blasting optimizationprovides a theoretical basis.