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Velosity In Blastting Mine

  • Calculation Of Peak Particle Velocity Caused By Blasting

    In order to protect the Sanyou Mine slope in Tangshan China from blasting vibration the peak particle velocity in step topography must be accurately calculated At present the reflection coefficient of the stress wave at free interface is not considered in the equation for calculating the peak particle velocity in step topography

  • Estimation Of Blast Induced Peak Particle Velocity At

    Sep 05 2013 Surface blasting may cause ground vibration in underground mine workings affecting their structural stability and resulting in loss of coal production The effects of surface blasting on adjacent underground workings have been studied using peak particle velocity PPV measured at various locations in two underground Bord and Pillar mines

  • Citizens Guide To Blasting

    The blasting seismographs used by coal mines are manufactured to specifically measure the vibrations from a mine blast The resulting measurements are on a different scale from those used for monitoring earthquake vibrations As such the particle velocity measured by blasting seismographs cannot be compared to earth

  • Estimation Of Nearfield Peak Particle Velocity A

    2Department of Mining Engineering Indian School of Mines Dhanbad India Accepted 24 July 2010 Peak particle velocity PPV is an important parameter in estimation of rock and structural damage In general ground vibration is measured using a seismograph at a distance from the blast face to

  • Understanding Blast Vibration And Airblast Their Causes

    velocity It is possible to record blast vibration as particle velocity displacement or acceleration depending upon the type of sensor being used It has become standard practice for blasting however to use particle velocity as the best descriptor of vibration as it

  • Chapter 8 Blast Design National Park Service

    situations may also require the adoption of a higher velocity more energetic explosive Where drilling and blasting conditions are both severe the operator should use premium explosives at least in the bottom one third of the drill hole Clearing the toe and therefore contributing to a smoother floor is a major asset to improve BLAST DESIGN

  • Vibration Standards

    The OSM and USBM RI 8507 blasting standards above both set lower ground velocity limits near home resonance frequencies than at higher frequencies but these differences a velocity factor difference of 267 between frequencies above 40 Hz and at 10 Hz are smaller than the observed amplifications a factor of up to 4 for corner vibrations in

  • Ri 8507 Structure Response And Damage Produced By

    In 1974 the Bureau of Mines began to reanalyze the blast damage problem expand the Duvall and Fogelson 1962 study and overcome its more serious shortcomings through the following efforts 1 Direct measurements were made of structural response and damage was observed in residences from actual surfacemine production blasting 2

  • Basic Mine Ventilation

    medium air velocity measurement is the Anemometer A high speed anemometer is most often used for high velocity air measurements Air always flows from a point of higher to lower pressure Blowing fans create a high pressure point immediately inby the fan Air travels from this high point through the mine

  • Blast Monitoring Equipment Construction Amp Mine Blasting

    ShotTrack is a company from Australia that is dedicated to the design development and manufacture of state of the art vibration analysis and electronic blast monitoring equipment for the mining and construction industries

  • Detonation Pressure Mininginfo

    Detonation pressure is the borehole pressure at the beginning of explosive detonation front This transient pressure is responsible for fracturing and crushing the rock around the borehole which is referred to as brisance

  • Development Of A Model To Predict Peak Particle

    Blasting Ground vibration Peak particle velocity PPV Dimensional analysis Sarcheshmeh copper mine abstract Ground vibrations arising from rock blasting is one of the fundamental problems in the mining industry and predicting it plays an important role in the minimization of

  • Locating Mine Microseismic Events In A 3D Velocity Model

    Figure 8 3D spatial location of the 2D slice in tomographic velocity model and 28 sensors and experiment blasting events in the Yongshaba mine a The 2D velocity slice is defined by the plane with the smallest projection distance to all sensors and the origin of the relative plane coordinates corresponds to the coordinate point in the lower

  • Anfo Emulsion And Heavy Anfo Blends Mining Engineer

    ANFO Emulsion and Heavy ANFO blends Useful explosive and blasting agent for modern day blasting Presentation Transcript Needed for an explosion Ammonium Nitrate AN An is a weak explosive base its explosion temperature being 1130 degree centigrade 2NH4NO3 2N2

  • Studying Peak Particle Velocity Due To Blast In

    Peak particle velocity is the main criteria for the evaluation of the damage caused by blast vibrations Twenty nine logs were recorded of three indicators namely the longitudinal transverse and vertical assessed in 29 blasting in AlborzeSharghi underground coal mine and twenty sets of data extracted thereof was subjected to a series of

  • Prediction Of Vibration Velocity Generated In Mine

    Ground vibration generated from blasting is a detrimental side effect of the use of explosives to break the rock mass in mines Therefore accurately predicting ground vibration is a practical

  • Calculation Of Peak Particle Velocity Caused By Blasting

    In order to protect the Sanyou Mine slope in Tangshan China from blasting vibration the peak particle velocity in step topography must be accurately calculated At present the reflection coefficient of the stress wave at free interface is not considered in the equation for calculating the peak particle velocity in step topography

  • Noise And Vibration From Blasting Guideline

    Title Noise and vibration from blasting Guideline Author Department of Environment and Science Subject This guideline sets out performance criteria to be used when setting operating requirements in conditions of environmental authorities issued under the Environmental Protection Act 1994 and in other approvals for activities involving blasting such as mines quarries and construction

  • Prediction Of Ground Vibration Intensity In Mine Blasting

    The present papers primary goal is to propose a novel hybrid model with high reliability to predict peak particle velocity PPVa ground vibration evaluation unit in mine blasting

  • Evaluation Of Ground Vibration Effect Of Blasting

    Apr 01 2009 1 IntroductionDrilling and blasting are the most widely adopted excavation techniques for mining and civil engineering Rock blasting results in ground shock and vibration which may cause damage to the surrounding structures such as buildings bridges dams tunnels etc therefore blastinduced ground shocks and their propagation in rock mass have been drawing more and more attention

  • Faq Aggregate Blasting Explosives And Aggregate

    Blasting accounts for a large percentage of production costs therefore it is to the operators advantage to maximize fragmentation by minimizing vibrations Blasting seismographs measure ground vibrations in terms of particle velocity which is the speed at which the ground moves Particle velocity is measured in inches per second

  • Citizens Guide To Coal Mine Blasting In Indiana

    Cast blasting is a type of blast design that uses the explosive energy to move overburden material across the pit This technique allows approximately 25 to 50 of the rock to be moved without the use of mine equipment This is a major cost savings to the mine Although cast blasting requires more pounds of explosive for each cubic yard of rock

  • Ground Vibration And Airblast Limits For Mines And

    Aug 17 2020 In addition the noise levels experienced from blasting at a mine site are unlikely to cause any hearing damage to anyone outside the worksite Annoyance and discomfort from blasting can occur when noise startles individuals or when airblast or ground vibration causes vibration of windows or other items at a sensitive site

  • Controlled Blasting Metallurgist Amp Mineral Processing

    Jan 27 2018 Controlled Blasting Experiments Eleven controlled blasting experiments were conducted on the 70 m level of the Experimental Mine Most of the experiments consisted in testing variations of smooth blasting techniques one presplit blast Experiment 4 and one blast round with short delay detonators Experiment 5