The Propagation Law Of Blasting Seismic Waves On Structural Surfaces Containing Different Filling Media

The propagation law of blasting seismic wave on slopes with structural planes is relatively little studied.Based on the scientific and technological research project of Jiangxi Education Department(GJ160643)and the key subject subsidized project of Jiangxi University of Technology(3304000004),the physical similarity model of open-pit slopes is established and blasting tests are carried out.The shadows of blasting seismic wave propagation on structures with different filling media are thoroughly analyzed.Some conclusions are drawn as follows.1.Establish physical model in blasting laboratory,refine the structural plane dip and filling medium at step 3,and study the attenuation law of blasting seismic wave after passing through the structural plane.Through the analysis of marginal energy spectrum,it is found that the blasting vibration signal tends to develop to low frequency with the increase of elevation,and the waveforms are more abundant after passing through the water-bearing structure plane.2.The physical similarity model is established in the blasting laboratory.The attenuation law of blasting seismic wave after passing through the structural plane is studied by refining the dip angle of the structural plane and filling medium at step 3 of the model.The blasting seismic wave shows certain elevation amplification phenomenon under different filling media and different structural plane inclination,but the peak seismic velocity of blasting seismic wave does not decrease after elevation amplification,which may be related to the size of the model.Through the analysis of marginal energy spectrum,the waveforms are more abundant after passing through the structural plane.3.In the similar model,the peak seismic velocity in each direction at the first measuring point after blasting seismic wave passes through the sandwich with different filling media has the following regularity: the tangential peak seismic velocity in the water-bearing area of prefabricated structural plane 15 to 35 is greater than that in the shaly sandwich area,and the tangential peak seismic velocity in the 45 to 75 region with different filling media is smaller than that in the homogeneous area.When the filling medium of structural plane is water,the radial peak seismic velocity is the largest,and the radial peak seismic velocity of homogeneous region is the second and larger than that of other filling medium regions.Vertical peak velocity is larger in homogeneous region and smaller in filling medium region.Vector and peak seismic velocity increase with the angle of structural plane,which shows that the peak seismic velocity in water-bearing area is larger than that in homogeneous area,followed by shale area,and the minimum peak seismic velocity in fine sand and non-filling structural plane.The propagation law of the peak blasting velocity at the structural plane may be the result of the interaction of the physical properties of the filling medium and the dip angle of the structural plane.4.When the blasting seismic wave passes through the same filling medium at different angles,the tangential and vertical peak seismic velocities decrease with the increase of the angle of the structural plane.Although the radial peak seismic velocity does not decrease linearly with the increase of the structural plane angle,it also shows that the peak seismic velocity is larger at the prefabricated structural plane No.4 measuring point in the 15 region and smaller in the 55 to 75 region.When the blasting seismic wave passes through the structural plane with different angles,the transmission coefficient of the blasting seismic wave decreases with the increase of the incident angle of the seismic wave.The transmission coefficient of the blasting seismic wave is proportional to the energy that can pass through the structural plane,and the transmission energy decreases with the increase of the dip angle of the structural plane.With the increase of structural plane angle,the peak velocity of blasting seismic wave in all directions decreases gradually with the increase of incident angle.5.In the process of spontaneous blasting,the response spectrum analysis shows that the frequency component of spontaneous blasting is relatively simple,the number of sudden peaks is small,and the amplification effect is related to the characteristics of the structure itself.