Ultrasonic Simulation Of Incident Direction Of Seismic Wave Impacting On The Wave Field Characterristics Of Slope

Nowadays,earthquakes are frequent,and It has caused serious damage and great economic loss to human.The powerful earthquake destroyed buildings,causing the secondary geological disasters,such as landslides,mudslides and barrier lakes.Therefore,the analysis of the stability of the slope is the great task for the study of geotechnical engineering and seismic engineering.The analytical methods of seismic stability of slopes are mainly theoretical formulas,numerical simulation and vibration bench test.However,due to the limitation of vibrational frequency,vibration table test cannot accurately simulate the actual size of slope.So it cannot also accurately simulate seismic wave propagation in the slope.Therefore,seeking a physical simulation method of meeting the physical similarity of the seismic wave propagation in the slope becomes one of the key technical problems about the earthquake response of physical simulation research in the slope.First in the plane of incidence the vibration wave field vibration and observation technology were researched,including studying the theory of simulating plane source by point source,the method of the oblique incidence of seismic wave and the observations of different vibration phase.Then according to the principle of similarity,the three specific models are designed to be flat,convex and concave two-dimensional slopes,satisfying the physical and geometric similarity principle.The appropriate model material was chose.The boundary of the model is designed according to the rule of the model boundary.According to the superposition of Huygens' principle in the cross section using point source excitation vibration generates elastic wave field in the different direction of incident plane P and SV waves to simulate wave field distribution in the slope.The model test data collecting of P and SV waves incident vibration was Supplemented.combined with the project team has completed SH wave excitation and part of P wave excitation model experiment data and research results,the slopes of three representative form of P,SV wave incident seismic response of arbitrary direction was studied.Results analysis: combined with the previous research of vertical incidence(0 °)and 30 °,45 ° inclined incidence,in the straight slope model plate P wave in the vertical incident(0 °)is the most violent vibration.Other angles oblique incidence of slope vibration are reduced in different degree.In the straight slope model of vibrating plate SV wave in-75 °,30 ° oblique incidence(entering on the back slope)vibration energy distribution characteristics is researched.The slope's vibration in-30 °oblique incidence is stronger vibration than in-75 ° inclined incidence.In addition,energy distribution of the slope is stronger in the slope area,and there is an energy gathering phenomenon.Wave energy distributions in three slope surface models,straight,convex and concave,are analyzed.On the surface of the convex slope model energy is stronger than straight on the surface of the slope,on the surface of the straight slope energy is stronger than concave on the surface of the slope.The dynamic response of straight slope,convex,concave slope in 15 °,60 ° oblique incident P wave and SV wave excitation is also a certain alternating change rule.