Research On The Rock Blasting Vibration Damnification Based On Hilbert Energy Analysis

Blasting is one of the primary means of rock excavation, which plays anincreasingly important role, and the rock damage caused by blasting vibration hasbeen concerned by people for a long time. Although a lot of constructive researcheshave been done on the rock blasting vibration damage by Chinese and internationalscholars, the problem is arduous and complicated because of the complexity, masking,abruptness and vibrated rock’s variability of blasting vibration damage. Therefore,rock blasting vibration damage is still a difficult and complex problem. An in-depthand systematic study has been made on the blasting vibration characteristics, rockresponse characteristics, blasting vibration energy damage theory, the relationshipbetween rock damage range and Hilbert energy, which utilizing EEMD-HHT signalanalysis method based on the analysis of project blasting vibration monitoring androck damage range monitoring data. It mainly includes the following aspects:(1) EMMD-HHT Analysis of Blasting Vibration and Its ApplicationThis paper applied EEMD-HHT method to the blasting vibration signal analysis,which was a great innovation among blasting vibration signal analysis methods. Themethod has strong adaptability in the process of EEMD decomposition and caneffectively restrain the phenomena of mode mixing in empirical mode decomposition.Therefore, EEMD-HHT method has the very strong applicability and superiority instrong nonlinearity and non-stationary blasting vibration signal analysis.(2) Modern Spectral Estimation and its Application in the Research ofCharacteristic Analysis of Rock Blasting Vibration Signals’ Frequency SpectrumThis paper applied modern spectral estimation of Autoregressive (AR) modelparameters to rock blasting vibration signal spectrum analysis for the first time. Thepower spectral density curve of rock blasting vibration signal is smooth, the varianceis comparatively small, the main frequency is clear and has no false peak nearbybased on modern spectrum method.(3) Research on Signal De-noising of Blasting Vibration Signals Based onCorrelation of EEMDEEMD decomposition embodies the adaptive filtering properties, thus has astrong applicability for the strong nonlinear and the non-stationary of blasting vibration signal. We get the de-noising blasting vibration signals through eliminatingnoise component by the IMF component relevant analysis and reconstructing thenon-noise components.(4) Analyze of Rock Blasting Vibration Characteristics with Hilbert EnergySpectrumIt is achieved that almost all of rock blasting vibration energy is in theintermediate frequency range, and in the high frequency and low frequency part of theenergy distribution is very low, after analyzing the each IMF component containedenergy of signals. Analyzed the Hilbert instantaneous energy of each IMF component,it is found that high frequency components effect on rock vibration in a relativelyshort time, but a long time with low frequency part.(5) Research on Analysis of Rock Blasting Vibration Response Based on theHilbert Energy MethodFrom the perspective of the Hilbert energy, we analyze the relationship amongmarginal energy of the blasting vibration, the instantaneous energy and the rockdynamic response and get the conclusion that the maximum response of blastingvibration is the result of the joint action of rock natural period and its vibration energy,rather than by the maximum value of the marginal energy and the instantaneousenergy.(6)A Discussion of Damage Mechanism of Rock Blasting Vibration from theviewpoint of the Hilbert EnergyThe rock damage induced by blasting vibration is influenced by blastingvibration characteristics and structural dynamic characteristics. This paper discuss themaximum momentary input energy, excellent instantaneous input energy, the totalinput energy and the relative displacement response of the energy to research the rockdamage mechanism by blasting vibration, the results show that the relativedisplacement response of energy is more comprehensive to reflect the combinedaction of the blasting vibration characteristics and structural characteristics.(7) Evaluation for the Rock DamageA further research of the relationship between the Hilbert energy value of theRock blasting vibration signal and the depth range of rock damage shows that thecorrelation between the maximum momentary input energy, excellent instantaneousinput energy, the total input energy, the relative displacement response of the energyand the depth of rock damage is more and more strong. Using the correlation between the relative displacement response of the energy and the depth of rock damage, theformulas which could estimate the depth range of rock blasting vibration damage isproposed.