| Many earthquake disasters had given great harm and loss to human,slope instability caused by earthquake being one of them.Therefore,it is very important to study on the field of the slope instability to the earthquake.Although a series of study have been carried out by many scientists,in some vibration table simulation,some problems still exist in the seismic dynamic response,such as the mismatching of the slope model scale and prototype slope scale,resulting in unable to realize issues of oblique incidence.On the basis,in this paper,the ultrasonic used to simulate that the incident seismic wave impact on wave field characteristics of the slopes in each direction.First of all,according to the principle of similarity,the selected excitation transducer and receiving transducer flat rate is 1k,and the three models,flat,convex and concave decorate reasonably,is designed and made of organic glass.The observation point has been decorated reasonably on the models,with the completion of the experimental system.Secondly,based on huygens’ principle,there is an analysis on difference of process time of the different angle of the incident wave and using point source of vibration wave field to superpose excitation of 0°~ 90° incident plane wave incidence of vibration.Each measuring point waveform of each model was synthesized in different angle plane wave excitation model.The earthquake responses of the model wave field are obtained.Further extracting the maximum amplitude of each measuring point response waveform(proportional to the measuring point vibration velocity),seismic response mode of each slope model are formed under different incident Angle plane wave vibration excitation(the maximum velocity contour map of slope particle).In addition,for each model for seismic wave propagation path analysis(ray analysis),from the angle of wave propagation,it has made a deeper understanding of simulation results of the earthquake response of the slope.At the same time,there are seismic responses numerical simulations of the slope in the different direction of incident plane wave excitation.To a few of slopes in plus or minus 15 °incidence angle,the results of numerical simulation and theultrasonic physical simulation have good consistency.The analysis results show that the ultrasonic was used to simulate seismic wave in each direction of the incident wave field characteristics of slope is reasonable and different.To 15° incident slope,three models are characterized by near slope and bottom of a strong response;to-15° incident,three kinds of models of near the slope top and bottom department is a strong response.Convex slope face reflected wave had an obvious convergence effect.Convex slope face reflected wave had an obvious convergence effect.A relatively flat slope reflection wave distribution more uniform.Represented by feature points,to contrast the monitoring waveform of the ultrasonic physical simulation and the numerical simulation model,it further proves the rationality and validity of the ultrasonic physical simulation experiment.The experimental simulation method and results can provide information for future seismic physical simulation of slope. |
