Blast vibration response prediction method based on spline interpolation

Abstract

The invention discloses a blast vibration response prediction method based on a spline interpolation. The method includes the steps: acquiring measured data of rock and soil medium vibration under theaction of a blast load; calculating proportion dosage of each measuring point, and performing waveform filtering on an acquired waveform of each measuring point; performing fast Fourier transform onmeasured time domain waveforms to obtain waveform frequency domain amplitude spectrums and phase spectrums; extracting frequency domain amplitudes and phase values of the waveform frequency domain amplitude spectrums and phase spectrums at all time; performing spline interpolation on a frequency domain amplitude and a phase value corresponding to a waveform of each frequency component at each measuring point thrice to obtain a fitted curve; substituting the proportion dosage of the measuring point into the fitted curve to obtain frequency domain amplitudes and phase values under frequency, andacquiring prediction frequency domain amplitude spectrums and phase spectrums by the aid of linear interpolation; acquiring time domain vibration prediction waveforms. According to the method, integrated blast vibration time histories of any position within a certain range can be predicted, prediction data needing to prepared is easily acquired, and practical engineering application is facilitated.

Description

technical field [0001] The invention belongs to the field of blasting vibration frequency spectrum prediction, and in particular relates to a blasting vibration response prediction method based on spline interpolation. Background technique [0002] In the process of rock blasting, only 20%-30% of the energy acts on rock mass destruction, and the rest of the energy is dissipated in the form of vibration, dust, flying stones, shock waves, noise, etc. Among them, blasting vibration is considered to be the most important factor in blasting construction. The most important negative effect. Blasting vibration is one of the research focuses of scholars in the field of engineering blasting at home and abroad. Excessive blasting vibration will cause disasters such as building deformation, landslides, and cavern collapse. Pre-blasting assessment and prediction of blasting vibration intensity, and controlling blasting vibration within a safe range are important prerequisites for the s...

AI Technical Summary

Problems solved by technology

[0003] The propagation of blasting seismic waves in the medium is a complex mechanical process. Factors such as charge, detonation center distance, geological terrain conditions, and dynamic characteristics of rock and soil media will affect the blasting vibration effect. The existing prediction methods have gradually become difficult to meet the increasing demands. Safety requirements for blasting vibration

For example, the empirical formula method is easy for engine

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