Research On The Effect Of Charge Structure On Energy Transfer Of Blasting Vibration

Different charging structures can increase the energy utilization rate of explosives to a certain extent,thereby improving the blasting effect.At present,most of their researches are based on engineering tests and lack of relevant theoretical support.Therefore,based on the previous research results,Combined with Guiyang Longdongbao airport field leveling project,using modern signal analysis methods,to study the energy distribution characteristics of single-hole and group-hole blasting seismic wave bands under different charge structures,use rock block distribution as an indicator of improving blasting effects,and use response spectrum analysis Methods The blasting vibration signals under different charging structures were analyzed in order to enrich the theory of energy propagation and vibration control of blasting seismic waves under different charging structures,so as to improve the blasting energy utilization rate,improve the blasting effect,and achieve dual control of safety and quality.The main work has been carried out:(1)Based on single-hole and group-hole blasting test data of different charge structures,using wavelet(package)signal analysis method,the frequency band energy distribution characteristics of the signals under four working conditions are analyzed.The results show that:when single-hole blasting,the air gap The energy carried by the signal in the low frequency(0～15.652Hz)region of the charge and water coupling charge is less than that of the continuous coupling and radial uncoupled charges;when the group hole is blasted,the signal carries energy in the low frequency(0～15.652Hz)region The order is continuous coupling charge,radial uncoupling charge times,water-coupling charge,and middle air gap charge.(2)In view of the shortcomings of wavelet(packet)analysis methods such as uncertainty of wavelet base selection,energy leakage in the length of wavelet base,and difficulty in quantifying the energy-frequency-time distribution,this paper proposes the most The optimal smoothing noise reduction algorithm uses the noise reduction mean square error and the curve tortuosity as the judgment criteria.By constructing the simulated signal and using the noise signal to noise reduction error ratio as the index,the optimal smooth noise reduction of EMD,EEMD and CEEMDAN The results of the algorithms are compared.The results show that the algorithm A4 obtained by CEEMDAN decomposition has the smallest signal-to-noise ratio,which is more conducive to the noise reduction of the measured signal.(3)Perform HHT transformation on the noise-reduced signal in each working condition,use the correlation coefficient and mean square error of each frequency band and the original signal as indicators,screen out the dominant components,and analyze the energy distribution characteristics and the destructive force.The results show that: The energy and destructive force carried by the single-hole and group-hole blasting vibration signals under the four working conditions are successively coupled charge,radial uncoupled charge times,water-coupled charge,and central air gap charge.(4)The picture of blasting block degree is automatically processed by Split-Desktop software,and the distribution data of blasting block degree under four working conditions is obtained,which is statistically compared,and the rock blasting effect under various working conditions is analyzed.(5)In order to study the vibration response law of blasting with different charge structures of rock mass characters,the blasting vibration velocity after noise reduction is used as the excitation input to obtain the relative displacement,relative velocity and absolute acceleration of single-hole and group-hole blasting under four working conditions And the response spectrum of standard acceleration,the dynamic response characteristics of the rock mass structure under various working conditions are compared and analyzed.The results show that the maximum peak of the response spectrum of the relative displacement of the central air interval charge blasting corresponds to the maximum frequency,and the rock mass structure is affected by The disturbance of inertial force is minimal,which is more conducive to structural safety.