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Controlling the Adverse Effects of Blasting

Part I: Ground Vibrations, Airblast, and Flyrock Explosive energy is used to break rock However, the use of this energy is not 100-percent efficient Some of the energy escapes into the atmosphere to generate airblast or air vibrations Some of the energy also leaves the blast site through the surface soil and bedrock in the form of ....

Controlling the Adverse Effects of Blasting

Part I: Ground Vibrations, Airblast, and Flyrock Explosive energy is used to break rock However, the use of this energy is not 100-percent efficient Some of the energy escapes into the atmosphere to generate airblast or air vibrations Some of the energy also leaves the blast site through the surface soil and bedrock in the form of ....

Frequently Asked Questions (FAQ) - McCallum Rock Drilling

By definition, flyrock is debris that is propelled outside of the blast zone Shot design, powder factor, stemming material, delay sequence, and blasting mats are all factors considered to control flyrock Every blast we design and shoot uses proper principals for all applications to control flyrock...

KALGOORLIE CONSOLIDATED GOLD MINES FLYROCK ,

The Terrock flyrock model has been developed after analysis of flyrock data from blasting in a wide range of rock types that has been acquired over many years The model is an empirical relationship that permits flyrock distances to be evaluated quickly and effectively...

best quarry rock blasting practices or designs in malaysia

best quarry rock blasting designs in malaysia best practices in quarry rock blasting in malaysia Development of a new model for predicting flyrock distance in quarry Apr 1, 2016 According to the results obtained from the test dataset, the best flyrock Blasting operation Flyrock distance Genetic ....

FLYROCK RE-VISITEDOn the Web Bruce Redpath Murphys ,

FLYROCK RE-VISITED,On the Web Bruce Redpath Murphys, California 95247 (February 2010) Over the past year I had reason to become re-acquainted with, and educated about, the fundamentals of flyrock ballistics For almost a decade during the previous century I was fortunate to be part of a ,...

Determining minimum burdens for quarry blasting

Potential Causes of Flyrock A section of rock has fallen out of the face, after the profiling has been carried out, causing a reduced burden which has not been identified and leads to over charging Shotfirer must carry out pre-blast face inspection and compare with profil (may need to re-profile the face before continuing to charge)...

Flyrocks – Detection and Mitigation at Construction Site ,

: Flyrocks–Detection and Mitigation at Construction Site in Blasting Operation certain mitigation measures discussed to control this ab-normal distance travel of flyrock Most of flyrocks fall in the region that forms a semi-circle in front of the face, Ludwiczak, (1985) These flyrock im-pacts cause craters or blownouts on the surface of bench...

Controlling the Adverse Effects of Blasting

Part I: Ground Vibrations, Airblast, and Flyrock Explosive energy is used to break rock However, the use of this energy is not 100-percent efficient Some of the energy escapes into the atmosphere to generate airblast or air vibrations Some of the energy also leaves the blast site through the surface soil and bedrock in the form of ....

H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

where Z = Flyrock factor ( 1 for normal blasting and 15 for controlled blasting A Rock factor (6 for very soft and 14 for hard rock (see = table 1) Q = Mass (kg) of explosives in 8 hole diameters or if the charge length is less than 8 hole diameters, the total mass of explosives Relative weight strengthS = of explosives (ANFO) = 100...

HQ Flyrock Dangers - sgcrcrockwoodorg

billion tonnes of rock by blasting and therefore is qualified to address the problem of blasting and flyrock in relation to the proposed Hidden Quarry in Rockwood William Hill lives on a farm 700 m north of the proposed quarry, a location which may imply to the reader personal conflict on his part in the preparation of this report...

Effect of Geological Structure on Flyrock Prediction in ,

In Minyak Beku, Batu Pahat also, blasting is implemented to fragment the rock mass, to reduce the in situ rock level to the required platform for a building construction However, during blasting work, some rocks get an excessive amount of explosive energy and this energy may generate flyrock...

Prediction of flyrock in open pit blasting operation using ,

Presently, the application of new approaches such as artificial intelligence is highly recommended In this paper, an attempt has been made to predict flyrock in blasting operations of Soungun Copper Mine, Iran incorporating rock properties and blast design parameters using support vector machine (SVM) method...

Preventing & Controlling Flyrock with Blast Mats and ,

Jan 11, 2018· Flyrock Due to Design Error: Design errors that can result in flyrock include spacing holes too close together, using large blast holes for small benches, drilling deviations, variations in burden that cause an uneven blast face and inadequate burden Flyrock Due to Adverse Rock Conditions: Rarely is a rock face perfect for blasting Problems ....

Drilling and Blasting Issues and Recommended Mitigation ,

Summary of Qualifications Andrew McKown, PE BS Civil Engineering, Tufts University MS Civil Engineering, MIT Professional Engineering License, MA Authored over 20 Professional papers on Blasting and Rock Engineering Over 35 Years Consulting on Drilling and Blasting and Rock Engineering projects...

Flyrock Dangers & Best Practices | Mine Safety and Health ,

Flyrock – the fragments of rock thrown and scattered during blasting – is responsible for a large proportion of all blasting-related injuries and fataliti Flyrock is a potential hazard anytime and anywhere there is blasting Reduce flyrock hazards by adhering to ,...

1998G - AVOIDING TRAGEDY: LESSONS TO BE LEARNED ,

of blasting which include flyrock, ground vibrations and airblast, how to protect the blast site , Proper stemming will be stress (sic) to reduce fly rock and will be a minimum of 10 feet of consolidated material All blast designs will direct , 1998G - AVOIDING TRAGEDY: LESSONS TO BE LEARNED FROM A FLYROCK FATALITY - P 559 3 of 15...

Safety Alert - Blast Control - Flyrock incident

Blast Control – Flyrock Incident INCIDENT During a quarry blast under the control of a contractor, flyrock was projected more than 500 metres onto the Pacific Highway A rock of approximately 100mm diameter was also projected onto a nearby property where it caused damage to a ,...

Blasting Regulations Changes & Flyrock

Blast Design Must Prevent Flyrock Flyrock incidents are to be immediately reported to DMM 4VAC25-40-800D Flyrock usually results in a closure order issued to the mine operator requiring a DMM-approved blasting plan, and a notice of violation issued to the blaster January 2007...

Prediction of Flyrock in Mine Blasting: A New ,

Blasting is the predominant rock fragmentation technique in civil constructions, underground and surface min Flyrock is the unwanted throw of rock fragments during blasting and is the major cause of considerable damage in and around the min The present research aimed to propose a new intelligence-based method to predict flyrock...

Flyrock Assessment – prepared by Blast Technology – dated ,

Controlling Flyrock Since flyrock has the potential to cause damage or harm, it is considered the most important factor over which total control is required – flyrock can be eliminated through strict charging protocols Flyrock can be considered as any rock fragment which is projected from the blast area beyond the clearance zone, or beyond the...

Prediction of blast-induced flyrock in Indian limestone ,

Blast design data, such as burden, spacing, stemming, average depth of blast holes, blast hole diameter, charge per hole, linear charge concentration, specific charge (ie ratio of explosive consumed to tonnage of rock broken per blast, kg/t), maximum throw of flyrock or flyrock distance from the blasting face, are generated before blasting ....

H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

where Z = Flyrock factor ( 1 for normal blasting and 15 for controlled blasting A Rock factor (6 for very soft and 14 for hard rock (see = table 1) Q = Mass (kg) of explosives in 8 hole diameters or if the charge length is less than 8 hole diameters, the total mass of explosives Relative weight strengthS = of explosives (ANFO) = 100...

Research Article A Novel Approach for Blast-Induced ,

Research Article A Novel Approach for Blast-Induced Flyrock Prediction Based on Imperialist Competitive Algorithm and Artificial Neural Network AminatonMarto, 1 MohsenHajihassani, 2 DanialJahedArmaghani, 1 EdyTonnizamMohamad, 1 andAhmadMahirMakhtar 3 Department of Geotechnics and Transportation, Universit i Teknologi Malaysia (UTM),Skudai, Johor, Malaysia...

Construction Blasting Risk Management - IRMI

Construction Blasting Risk Management As we can see from the November 2008 article, "Construction Blasting Fundamentals," there are many forms of risk associated with blasting workIt is clear that, despite these risks, experience reveals that blasting can be performed without incident, when adequate risk-control measures are used to manage the work...

controlled Blasting for civil construction in an urban ,

controlled Blasting for civil construction in an urban Environment R Domotor1 ABstrAct Brisbane’s Airport Link is Australia’s largest road infrastructure project, worth a total value of A$48 billion The project is using surface and underground blasting to excavate hard volcanic rock, Brisbane Tuff...

A Novel Approach for Blast-Induced Flyrock Prediction ,

Jul 22, 2014· Flyrock is unwanted rock fragments thrown during bench blasting in mines and civil constructions Flyrock, which is propelled rock fragments by energy of explosive beyond the blast zone, is one of the undesirable environmental impacts of blasting operations In flyrock mechanism, there is an affective relationship among explosive energy ....

A blast with flyrock occurring, Avalon II, Shelton, CT ,

Mar 01, 2008· The occurrence of flyrock is a hazard and not acceptable to Blasters , A blast with flyrock occurring, Avalon II, Shelton, CT sheltonpulse , Controlled Rock Blasting on I-90 Snoqualmie Pass ....

REVIEW ARTICLE Flyrock in surface mine blasting ,

blasting The said rock mass and blast design anomalies favour the channelling of high-pressure gases emanating from the blast hole(s) in the direction of the weakest zone and result in fragments travelling unwanted distances than desired Such fragments are called ‘flyrock’ Flyrock is one of the crucial issues in bench blasting....

Blasting mat - Wikipedia

Use Blasting mats are used when explosives are detonated in places such as quarries or construction sit The mats are placed over the blasting area to contain the blast, suppress noise and dust as well as prevent high velocity rock fragments called fly rock (or flyrock) from damaging structures, people or the environment in proximity to the blast site ....