Understanding blast vibration and airblast, their causes, and their damage potential author. Determination of blastinduced ground vibration equations. Often times, these persons are not very knowledgeable of the relationship between waves and ground vibration. Peak particle velocities calculated from the measured accelerations were compared with predictions from the chargeweight scaling law using typical site parameters which would be adopted. Using piezoelectric accelerometers to convert vibratory motion into an electrical signal, the process of measurement and analysis is ably performed by the vers. A typical example of this is the analysis of the results of blasting vibration on the quarry for around 10 years in usm by. The advent of the microprocessor has enormously advanced the process of vibration data acquisition and analysis in recent years. California department of transportation contents transportation and construction vibration guidance manual page iii september 20 11. The detailed analysis of many blasts from many different locations and rock. Blast iq solutions the blast iq system provides the tools to plan, execute. Timehistory analysis response spectrum analysis structural response to blast loads blast load computation dynamic response analysis floor vibration due to machinery and human activities rotating machinery vibrations soil stiffness, soil damping and foundation design for rotating machines. The principal disturbances created by blasting in openpit mines are vibrations, air blast and fly rock. Blast vibration analysis to assess and control rockmass damage has not been studied extensively, and rockmass damage criteria related to vibration levels and frequen cies are not entirely clear. Calculation of blast loads for application to structural.
The key objective for blast vibration monitoring was to assess the extent of blast vibration damage and provide recommendations on drill hole orientation, ring burdens, standoff distances. Understanding blast vibration and airblast, their causes, and. Pdf blast vibration analysis by different predictor. Measurement of blast damage office of surface mining. Jksimblast is a comprehensive suite of programs for blast design and analysis. Furthermore, achieving optimal fragmentation distributions to. Insitu blast vibration monitoring in cemented rockfill. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Duvall us department of interior office of surface mining reclamation and enforcement kenneth k.
The blastvibrations monitoring system was developed to meet the growing demand for an automated system that provides immediate access to vibration data. This paper aims to establish that excessive blast induced vibrations are the prime cause of backfill dilution at the case study mine. This leads to blast load idealization and simplifies the classification of blast load regimes. However, the analysis on vibration frequencies is less studied compared to investigations of. Transportation and construction vibration guidance manual. Using attenuation analysis of different frequency bands of measured acceleration signals, it was found that blast vibration attenuation between 2 m and 4 m depended not only on frequency but also on amplitude. Bollinger in blast vibration analysis makes an important contribution to this study focusing on the origin, transmission, and types of elastic wave in solid media.
Fundamentals of vibration measurement and analysis explained thanks to peter brown for this article. Determination of blast induced ground vibration equations for rocks using mechanical and geological properties. Vibration analysis can help you detect a wide variety of fault conditions. Fullscale tests for assessing blastinginduced vibration.
The blast vibration consists of the different waves from many holes with propagation controlled by the physical and structural properties of the ground through which it travels. All of these problems, under some circumstances, may cause severe damage to structures nearby and, apart from that, these can be the possible sources of permanent conflict with the inhabitants who live close to the operation. Machine vibration can often be intentionally designed and so have a functional purpose2. Blast vibration and its attenuation within the rock mass immediately adjacent to a blast hole 215 m were monitored for a blast hole diameter of 100 mm and a 2. Technical corner pt papers and articles in portuguese. Vibration frequency analysis is used in structural damage assessment and control. As the shaft turns, there are frictional and rotational forces. Uncertainties in vibration analysis from blasts can be attributed to the problem of determining the actual amount of explosive detonating within a. Nowadays, blasting vibration safety standards are based on both the particle velocity and the frequency of vibration and they have been adopted widely and internationally. Ppv is defined as the maximum motion velocity of a particle on or in the rock induced by the passage of blast vibration waves. Blast induced vibrations can be monitored to assess the stability of crf and to determine the blast waveforms for a detailed analysis using numerical models. This document was created by field experienced skf application engineers using measurements obtained with skf.
At other times machine vibration can be unintended and lead to machine damage. An integrated approach of signature hole vibration. An assessment of blasting vibrations science publications. A case study for a blast vibration test which distance blast source 10 m, 25 m, 40 m on the tunnel and the wave analysis of y direction blast vibration wave which distance blast source 10 m were performed, and the results indicated the following. Measurement of blast induced ground vibrations and seismograph calibration by marks. Huanganalysis of ground vibration caused by open pit production blast. A comparative analysis between the results obtained by the. For the understanding and analysis of blast vibrations, scientists and engineers require a sophisticated understanding of wave phenomena. The vibration signature changes as the condition changes. This book is about the monitoring of undesirable machine vibration. Therefore, having data on the frequencies present from the blast allows assessment of. Structuralvibration analysis, design and troubleshooting.
Bollinger, southern illinois university press, 1980 2 pp. Whilst the behaviour of whole structures is the main concern in earthquake actions analysis, the behaviour of individual elements of buildings and. Stagg 1 and alvin j, engler2 abstract blast induced ground vibrations from surface coal mine, quarry, and construction blasting were measured and analyzed for frequency content and duration characteristics. The blastvibrations system simplifies the monitoring and reporting process by providing secure and reliable access to data from anywhere, at anytime. Pdf blast vibration analysis by different predictor approachesa. Beginners guide to machine vibration proviso systems ltd.
Blasting is a majormechanism of rock fragmentation. Blast vibration analysis by different predictor approachesa comparison. Vibration control in an opencast mine based on improved blast vibration predictors, mining science and technology. Most times machine vibration is unintended and undesirable. Blast iq solutions the blast iq system provides the tools to plan, execute, measure and analyse each blast. This included blast vibration monitoring of both signature holes and production. Also included in the analysis were peak ground vibration amplitude readings. Thus, analyzing the hazard degree of nearsurface or surface blasts is primarily based on the transmission properties of air blast waves and the vibration strength of land surfaces. Pdf nearfield blast vibration monitoring and analysis. Vibration diagnostic guide vibration diagnostic guide part 1 this guide is designed to introduce machinery maintenance workers to condition monitoring analysis methods used for detecting and analyzing machine component failures. A further study on the attenuation laws of blasting. Structural response and damage criteria for blast vibrations including considerations for frequency spectra and amplitude. Blast induced vibration may cause damage to nearby structures and local inhabitants, and in the case of serious problems, entails huge time and cost overruns in construction.
Yet complaints continue and, in a few of these cases, vibration damage cannot be positively ruled out and the damage attributed to the more common reactive clay foundation movement i n the hunter valley, at least. In order to best manage the blast vibration while achieving maximum productivity, a project of blast vibration monitoring, analysis, and modeling was conducted at the site. Blast design is a process which needs to be monitored continuously as the rock mass exhibit many vibrations within the same boundary. Bender this document was originally presented at the spring 2006 and fall 2007 workshops of the golden west chapter of the international society of explosives engineers and has been updated and revised to include new material. Blast vibration analysis by different predictor approaches. Pdf nearfield blast vibration monitoring and analysis for.
Structures have a varying response to vibration over the frequency range and are significantly affected at the structures natural frequency. Reduction of blastinduced vibration in tunnelling using. This category may also include unique hazards presented from tasks that require demanding or challenging degrees of mental andor physical effort to be exerted by an. Blast iq vibration control allows designs in highly sensitive vibration. Safety distance of shotcrete subjected to blasting. Numerical analysis of the dynamic response of slope. White seismographs are unmatched in their ruggedness, reliability and value. Only through effective measurement can damage mechanisms be identified and related to the blast design and geological environment. Analysis of the main factors influencing the dominant frequency of blast vibration da liu, 1,2 wenbo lu, 1,2 yijia liu, 1,2 ming chen, 1,2 peng yan, 1,2 and pengchang sun 1,2. Case of metlaoui mining basin, southwestern tunisia monia aloui 1, yannick bleuzen 2. Pdf controlled blasting methods implemented for a highway cut project.
Explosive and blasting technique, holmberged, balkema 2000, pp. Blasting vibration can be evaluated based on vibration velocity, acceleration, frequency, etc. Pdf vibration controlled blast design and monitoring close to a. A failure wave was postulated based on observations at the monitoring hole 2 m from the blast. A case study on safe blast design with vibration analysis. Therefore, a vibration control study was performed in mines on. Pdf blasting is a majormechanism of rock fragmentation. In order to solve the problem of blast induced vibration, various methods have been examined based on the screening or suppression of blast induced waves.
Numerical analysis of the dynamic response of slope under. Abrasive blasting operations, engineering control and work. Blast vibration analysis by different predictor approachesa comparison article pdf available in procedia earth and planetary science 11. Besides quality equipment, our primary goal is superior customer service. Explosive usage creates ground vibration, air over pressure as well as fly rock.
Working in cramped spaces, repetitive movements, awkward postures, vibration, heavy lifting, etc note. Understanding blast vibration and airblast, their causes. Fundamentals of vibration measurement and analysis explained. Pdf stope blast vibration analysis at dugald river.
Frequencydependent criteria are important for assessing the blast induced vibration effects on buildings and other structures and are the recommended. Eltschlager miningexplosives engineer 3 parkway center pittsburgh, pa 15220 phone 412. The main blast design programs can be used standalone, or with the other programs for extended blast analysis and data management. Signature hole blast vibration control twenty years hence and beyond. Analysis of the main factors influencing the dominant. Its often the case where operators skimp on the blast design to save money. Introduction the united states department of health, education, and welfares national institute for occupational safety and health niosh is responsible for conducting research and developing educational and training materials in the. Measurement and analysis of nearfield blast vibration and. Includes typical methods including scaled distance, linear regression, signature hole analysis, and modern improved signature hole analysis. Blast vibration analysis is one of the important topics in the control technology of blast vibration damage. Final report role of blast design parameters on ground vibration.
To do this, a common approach is to use a 3d plot like a topographic map of delay versus frequency, with. Numerical analysis of the dynamic response of slope under the. Wavelet packet analysis of blasting vibration signal of. Analysis of the blastinduced vibration structure in opencast mines. Their little knowledge has forced the homeowner to be very confident in consultants analysis of. Jksimblast is a suite of programs for blast design and analysis. Vibration control using a smartphone accuracy, validation. Explosives engineering exp eng blast vibration prediction methodologies. Analysis of ground vibrations caused by bench blasting at can. Often the quantum of explosive had to be determined within safe vibration limit. A new approach in blast vibration analysis and prediction at iron ore. Measurement tasks that took hours only two decades ago.
However, theres increasing interest in optimising all blast requirements and objectives in the primary blast design. Uav application for blast design and fragmentation analysis. Section 1 provides information on how the guideline was developed, what extra features have been included since the previous guideline environmental noise control manual, chapter 174 and who the. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. Mine blasting vibration and its effects on buildings and. It is available as standalone modules and three packages. The prediction of vibration phenomena is a very powerful procedure in order to control and mitigate safety and environmental issues due to the possibility to identify potentials risk and beforehand, adjust the blast variables to minimize those risks. Importance of blastdesign in reduction of blastinduced. Blast vibration analysis by different predictor approachesa. Analysis of blast velocity and stress based on microseismic monitoring data. An introduction to vibration analysis theory and practice.
1212 1300 183 820 975 924 1048 1485 1492 1475 228 947 893 208 1269 1238 907 1015 375 375 926 454 1412 1171 1423 722 716 775 494 340 759 1248 1050 1171 631 537 1201 1162 179 1087 80 1248 1182 435 1265 1090