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Analysis of blasting vibration signal of high steep anti-dip layered rock slope

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Journal of Mountain Science 2022年第11期19卷 3257-3269页

作者： SUN Xiao-ming PANG Shi-hui QIN Ke SHITing-ting ZHU Chun TAO Zhi-gang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of Mechanics and Civil Engineering China University of Mining&Technology(Beijing)Beijing 100083China College of Earth Science and Engineering Hohai UniversityNanjing 210098China

blasting is one of the most economical and efficient mining methods in open-pit mine production.However,behind the huge benefits,it poses a hidden threat to the quality of slope rock mass,stability of slope,and safety of nearby buildings.In order to explore the influence of blasting vibration on the stability of anti-dip layered rock slopes,herein,the site near the large-scale toppling failure area of Changshanhao gold mine stope of Inner Mongolia Taiping Mining Co.,Ltd.was selected for on-site blasting test and monitoring.The Peak Particle Velocity(PPV)measured at the monitoring point is located on the lower side of the maximum allowable vibration velocity curve that is prepared based on the allowable speed standard evaluation chart in the full frequency domain established by standards practiced in various countries such as German DIN4150,the USBM RI 8507,and Chinese GB6722-2014.This indicates that the blasting vibration has less influence on the location of the monitoring point.The vibration signals obtained in the blasting test were analyzed using the wavelet packet theory,and it was concluded that the blasting vibration signals measured in the anti-dip layered rock slope were mainly concentrated in two frequency bands of 0-80 Hz and 115-160 Hz.The sum of energy of the two frequency bands accounted for more than 99%,wherein,the energy contained in the 0-80 Hz frequency band accounted for more than 85%of the monitoring signals.The vibration signal with 0-80 Hz frequency band monitored at the slope toe was selected for the energy attenuation analysis.The results showed that the energy attenuation decreased in radial,vertical,and tangential directions.Further,the Energy Attenuation Rate per Meter(EARPM)was calculated.In conjunction with the site characteristics analysis,it was found that the energy attenuation rate was significantly affected by the rock mass characteristics of the structural plane.The slope reinforcement project can effectively reduce the absorption of vibration energy by the slope and increase s

关键词： Anti-dip rocky slope blasting vibration PPV Wavelet packet theory EARPM

Comparison of dominant frequency attenuation of blasting vibration for different charge structures

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 448-459页

作者： Pengchang Sun Wenbo Lu Junru Zhou Xincheng Huang Ming Chen Qi Li State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan430081China Changjiang Institute of Survey PlanningDesign and ResearchWuhan430010China

Dominant frequency attenuation is a significant concern for frequency-based criteria of blasting vibration control.It is necessary to develop a concise and practical prediction equation describing dominant frequency attenuation.In this paper,a prediction equation of dominant frequency that accounts for primary parameters influencing the dominant frequency was proposed based on theoretical and dimensional analyses.Three blasting experiments were carried out in the Chiwan parking lot for collecting blasting vibration data used to conduct regression analysis of the proposed prediction equation.The fitting equations were further adopted to compare the reliability of three different types of dominant frequencies in the proposed equation and to explore the effects of different charge structures on the dominant frequency attenuation.The apparent frequency proved to be more reliable to express the attenuation law of the dominant frequency.The reliability and superiority of the proposed equation employing the apparent frequency were verified by comparison with the other five prediction equations.The smaller blasthole diameter or decoupling ratio leads to the higher initial value and corresponding faster attenuation of the dominant frequency.The blasthole diameter has a greater influence on the dominant frequency attenuation than the decoupling ratio does.Among the charge structures applied in the experiments,the charge structure with decoupling ratio of 1.5 and blasthole diameter of 48 mm results in the greatest initial value and corresponding fastest attenuation of the dominant frequency.

关键词： Dominant frequency blasting vibration Attenuation law Prediction equation Charge structures

A case study of blasting vibration attenuation based on wave component characteristics

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1298-1311页

作者： Chong Yu Haibo Li Haozhen Yue Xiaohu Wang Xiang Xia State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

A typical blasting vibration wave is a composite wave,and its attenuation law is affected by the type of dominant wave component.The purpose of the present study is to establish an attenuation equation of the peak particle velocity(PPV),taking into account the attenuation characteristics of P-,S-and R-waves in the blasting vibration wave.Field blasting tests were carried out as a case to specifically apply the proposed equation.In view of the fact that the discrete properties of rock mass will inevitably cause the uncertainty of blasting vibration,we also carried out a probability analysis of PPV uncertainty,and introduced the concept of reliability to evaluate blasting vibration.The results showed that the established attenuation equation had a higher prediction accuracy,and can be considered as a promising equation implemented on more complex sites.The adopted uncertainty analysis method can comprehensively take account of the attenuation law of blasting vibration measured on site and discrete properties of rock masses.The obtained distribution of the PPV uncertainty factor can quantitatively evaluate the reliability of blasting vibration,which is a powerful and necessary supplement to the PPV attenuation equation.

关键词： blasting vibration Wave component Field blasting tests Attenuation equation Uncertainty analysis Bayesian theory

Geotechnical engineering blasting:a new modal aliasing cancellation methodology of vibration signal de-noising

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Earthquake Engineering and Engineering vibration 2022年第2期21卷 313-323页

作者： Yi Wenhua Yan Lei Wang Zhenhuan Yang Jianhua Tao Tiejun Liu Liansheng School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Civil Engineering and Architecture Nanchang UniversityNanchang 330031China School of Civil Engineering Guizhou UniversityGuiyang 550025China

In the present study of peak particle velocity(PPV)and frequency,an improved algorithm(principal empirical mode decomposition,PEMD)based on principal component analysis(PCA)and empirical mode decomposition(EMD)is proposed,with the goal of addressing poor filtering de-noising effects caused by the occurrences of modal aliasing phenomena in EMD blasting vibration signal decomposition processes.Test results showed that frequency of intrinsic mode function(IMF)components decomposed by PEMD gradually decreases and that the main frequency is unique,which eliminates the phenomenon of modal aliasing.In the simulation experiment,the signal-to-noise(SNR)and root mean square errors(RMSE)ratio of the signal de-noised by PEMD are the largest when compared to EMD and ensemble empirical mode decomposition(EEMD).The main frequency of the de-noising signal through PEMD is 75 Hz,which is closest to the frequency of the noiseless simulation signal.In geotechnical engineering blasting experiments,compared to EMD and EEMD,the signal de-noised by PEMD has the lowest level of distortion,and the frequency band is distributed in a range of 0-64 Hz,which is closest to the frequency band of the blasting vibration signal.In addition,the proportion of noise energy was the lowest,at 1.8%.

关键词： blasting vibration frequency empirical mode decomposition modal aliasing de-noising

Monitoring and Prediction of the vibration Intensity of Seismic Waves Induced in Underwater Rock by Underwater Drilling and blasting

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Defence Technology（防务技术） 2022年第1期18卷 109-118页

作者： Zhen-xiong Wang Wen-bin Gu Ting Liang Shou-tian Zhao Peng Chen Liu-fang Yu Research Institute of Chemical Defence 102205 China Armry Engineering University 210007China Archives Department of Space System100094China

All underwater drilling and blasting operations generate seismic waves.However,due to a lack of suitable vibration sensing instruments,most studies on the propagation of seismic waves have been limited to shorelines near construction areas or wharfs,whereas comparatively few studies have beerconducted on the larger seafloor itself.To address this gap,a seafloor vibration sensor system was developed and applied in this study that consists of an autonomous acquisition storage terminal,soft-ware platform,and hole-plugging device that was designed to record the blasting vibration intensities received through submarine rocks at a given measurement point.Additionally,dimensional analyses were used to derive a predictive equation for the strength of blast vibrations that considered the in fluence of the water depth.By combining reliable vibration data obtained using the sensor system in submarine rock and the developed predictive equation,it was determined that the water depth was ar important factor influencing the measured vibration strength.The results using the newly derivedequation were compared to those determined using the Sadowski equation,which is commonly used on land,and it was found that predictions using the derived equation were closer to the experimental values with an average error of less than 10%,representing a significant improvement.Based on these results the developed sensor system and preliminary theoretical basis was deemed suitable for studying the propagation behavior of submarine seismic waves generated by underwater drilling and blasting operations.

关键词： Seismic wave Underwater drilling and blasting blasting vibration Dimensional analysis Induced seismicity

Influence of millisecond time,charge length and detonation velocity on blasting vibration

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Journal of Central South University 2015年第12期22卷 4787-4796页

作者：陈士海吴建张子华 College of Civil Engineering Huaqiao University State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact College of Civil Engineering and Architecture Shandong University of Science and Technology

The law of blasting vibration caused by blasting in rock is very complex.Traditional numerical methods cannot well characterize all the influencing factors in the blasting process.The effects of millisecond time,charge length and detonation velocity on the blasting vibration are discussed by analyzing the characteristics of vibration wave generated by finite length cylindrical charge.It is found that in multi-hole millisecond blasting,blasting vibration superimpositions will occur several times within a certain distance from the explosion source due to the propagation velocity difference of P-wave and S-wave generated by a short column charge.These superimpositions will locally enlarge the peak velocity of blasting vibration particle.The magnitude and scope of the enlargement are closely related to the millisecond time.Meanwhile,the particle vibration displacement characteristics of rock under long cylindrical charge is analyzed.The results show that blasting vibration effect would no longer increase when the charge length increases to a certain extent.This indicates that the traditional simple calculation method using the maximum charge weight per delay interval to predict the effect of blasting vibration is unreasonable.Besides,the effect of detonation velocity on blasting vibration is only limited in a certain velocity range.When detonation velocity is greater than a certain value,the detonation velocity almost makes no impact on blasting vibration.

关键词： cylindrical charge millisecond blasting blasting vibration peak particle velocity displacement

Attenuation Parameters of blasting vibration by Fuzzy Nonlinear Regression Analysis

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Journal of Beijing Institute of Technology 2020年第4期29卷 520-525页

作者： Chen Li Shufeng Liang Yongchao Wang Long Li Dianshu Liu School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

In order to reduce the influence of outliers on the parameter estimate of the attenuation formula for the blasting vibration velocity,a fuzzy nonlinear regression method of Sadov’s vibration formula was proposed on the basis of the fuzziness of blasting engineering,and the algorithm was described in details as well.In accordance with an engineering case,the vibration attenuation formula was regressed by the fuzzy nonlinear regression method and the nonlinear least square method,respectively.The calculation results showed that the fuzzy nonlinear regression method is more suitable to the field test data.It differs from the nonlinear least square method because the weight of residual square in the objective function can be adjusted according to the membership of each data.And the deviation calculation of least square estimate of parameters in the nonlinear regression model verified the rationality of using the membership to assign the weight of residual square.The fuzzy nonlinear regression method provides a calculation basis for estimating Sadov’s vibration formula’s parameters more accurately.

关键词： blasting vibration attenuation parameters fuzzy nonlinear regression membership

Construction of Wavelet Base and Its Applications in Signal Processing of blasting vibration

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Construction of Wavelet Base and Its Applications in Signal ...

Wavelet Packets Analysis Models for Prediction of blasting vibration Waveform

The Seventh International Symposium on Rock Fragmentation by blasting

作者： SONG Guangming, CHEN Shouru, WU Congshi3( Department of Applied Physics, College of Science, National University of Defense Technology,Changsha 410073 , China College of Resource, Environment and Civil Engineering, Central South University,Changsha 410083 , China Changsha Communication University, Changsha 410076, China)

＜正＞ According to the blasting vibration signal with a short continuance and a fast break, the analysis of wavelet transform is suitable for the signal processing of blasting vibration on multi-resolution analysis and singularity detection. Wavelet base must be selected or constructed depending on the character of blasting vibration and the analysis aims. Based on the comparison between the characteristics of wavelet base or wavelet series in existence and the demands of the wavelet analysis to blasting vibration signal, the discrete time wavelet transform and reconstruction of vibration waveform, with Daubechies wavelet series selected, take on higher precision through a case research. Based on the exponential attenuation wavelet base constructed by means of the response function induced by blasting impulse to 2-rank under-damp vibration system, the precise locating of the millisecond delay deduced from the max-modulus of continuous wavelet transform to a experiment vibration waveform coefficient, takes on good effects in precision.

关键词： blasting vibration Wavelet base Signal processing Identification of millisecond delay

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Wavelet Packets Analysis Models for Prediction of Blasting V...