• Emuline

    2021 9 14 blasting applications requiring de coupling of the explosive charge The product can be used for pre splitting post splitting and smooth blasting applications Emuline is packaged as continuous emulsion cartridges with an attached line of 15 g/m detonating cord ADVANTAGES Emuline distributes the load uniformly through the presplit boreholes

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  • Senatel Trimex

    Senatel Trimex is designed for the blasting of perimeter holes in mining construction and tunnelling operations Senatel Trimex provides a radially decoupled explosive charge in the blasthole It can be used for pre splitting applications for surface operations or smooth blasting

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  • MASTER

    2005 5 26 III SOME RECOMMENDATIONS FOR SMOOTH BLASTING from Hoek and Brown 1980 p 374 19 IV SOME RECOMMENDATIONS FOR PRESPLIT BLASTING from Oriard 1982 p 1592 20 V FURTHER RECOMMENDATIONS FOR SMOOTH BLASTING AND PRESPLITTING from Langefors and Kihi Strom 1978 p 310 20 VI TYPICAL PUBLISHED VALUES FOR THE CONSTANTS k Get Price

  • Different Rock Excavation Methods

    2017 7 10 The large diameter holes allow blasting depths up to 30 m 100ft The procedure produces a ragged final slope face One great thing about it is that it performs well in all rock types But radial fractures are more abundant than presplit and smooth blasting Slope face is more prone to raveling and a catchment area is recommended at slope base

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  • Determination of the Conditions of an Effective

    The use of charges with a longitudinal concavity for a directional destruction presplit blasting smoothwall chipping involves reducing the explosives consumption preserving the aquifer rock mass from additional explosion caused cracks obtaining a smooth contour and

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  • Analysis of Blasting Vibration Effects Under Different

    GuoJiang CuiWenqiang ChenHui Numerical analysis of the smooth blasting crack development under different coupling medium J Gold Science and Technology 2016 24 1 68 75 9 Van GoolB V Effects of Blasting on the Stability of Paste Fill Stopes at Cannington Mine D Townsville James Cook University 2007 10

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  • Controlled Blasting Techniques 2011

    2016 4 19 CONTROLLED BLASTING TECHNIQUE 1 PRE SPLITTING 2 SMOOTH WALL BLASTING 3 CUSHION BLASTING 4 LINE DRILLING 5 FRACTURE CONTROL BLASTING PRESPLIT BLASTING CMRI Principle of Pre split blasting CMRI When

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  • Comparison of Presplit and Smooth Blasting Methods for

    To understand differences of smooth and presplit blasting for the excavation of rock wells two field experiments using these two techniques are implemented at the same test site respectively The ground vibrations induced by them have been monitored with the different distances through the corresponding devices The vibration results illustrate that at the same monitoring distance and direction peak particle velocities and dominant frequencies of vibration signals based on pr

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  • Wenbo LU

    2017 1 20 Hu Yingguo Lu Wenbo Chen Ming Yan Peng Yang Jianhua Comparison of blast induced damage between presplit and smooth blasting of high rock slope Rock Mechanics and Rock Engineering 2014 47 1 1307 1320

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  • 2018 3 31 7 Tab 7 Smooth blasting parameter table 8 Tab 8 Smooth blasting quality evaluation standard 5 Fig 5 Blasting program simulation results 5 a g 1

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  • Summary of Surface Blasting with Comparison of Two

    2019 5 24 Compared smooth blasting with presplit blasting For each case there were production blasts buffer blasts and then either a smooth or presplit blast High Rock Slopes in China Smooth Blast Damage is predominately a result of the first two production blasts penetrating into the rock mass

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  • controlled blasting

    EXPLOTECH Presplitting Preshear Smooth Blastin A technique designed to provide the best possible p the final excavation wall Row of presplit holes are drilled at reduced spacing burden Presplit row may be fired days in advance of drillin blasting the production holes or at least 200 ms pri production holes in the same blast Holes are loaded with decoupled charges Presplit holes are detonated

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  • Simulation Modelling Practice and Theory

    2018 7 19 Rock mass blasting is a complex process which involves the coupling of both discontinuous and continuous media This paper aims to provide a numerical simulator capable of repro ducing the complete blasting response in rock mass by incorporating large deformations damage distribution and blasting vibration with a single numerical model A Smooth

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  • Rock Excavation and Its Various Methods

    But similar to presplit blasting there is a small boring diameter limits blasting depth to 15 m 50 ft Borehole traces are present for much of the boring length It does not protect the slope from damage caused by production blasting and also do not perform well in highly fractured weak rock

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  • International Journal of Mining Science and Technology

    2017 5 12 smooth blasting where more fragmentation is desired at one side of the fractured plane 10 Nakamura performed model experiments to examine the effec in presplit holes waves generated from each hole propagate in a spherical shape and cracks are generated around holes

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  • Senatel Powersplit

    Senatel Powersplit is designed to create clean walls and is ideal for perimeter blasting trimming and pre splitting With high velocity of detonation and low decoupled energy it minimizes wall damage leaving behind a smooth profile with minimal overbreak The product contains a centrally traced robust polyester rope and an external 5m

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  • International Journal of Mining Science and Technology

    2017 5 12 smooth blasting where more fragmentation is desired at one side of the fractured plane 10 Nakamura performed model experiments to examine the effec in presplit holes waves generated from each hole propagate in a spherical shape and cracks are generated around holes

    Get Price
  • MASTER

    2005 5 26 III SOME RECOMMENDATIONS FOR SMOOTH BLASTING from Hoek and Brown 1980 p 374 19 IV SOME RECOMMENDATIONS FOR PRESPLIT BLASTING from Oriard 1982 p 1592 20 V FURTHER RECOMMENDATIONS FOR SMOOTH BLASTING AND PRESPLITTING from Langefors and Kihi Strom 1978 p 310 20 VI TYPICAL PUBLISHED VALUES FOR THE CONSTANTS k Get Price

  • ComparisonofPresplitandSmoothBlastingMethodsfor

    2019 1 20 smooth blasting at the same distance and direction For the smooth blasting the frequency components of peripheral boreholes are inšuenced by the inner free face generated by main boreholes which makes the dominant frequency of peripheral boreholes with smooth blasting larger than that with presplit blasting at the same distance and direction

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  • Chapter 8 BLAST DESIGN

    2014 6 11 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

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  • PROCEDURES FOR BLASTING

    2015 9 17 blasting in conjunction with required presplit blasting or for general rock excavation The Contractor may also elect to use blasting for trenching operations structure excavations and structure demolitions Permit jobs that involve blasting on State ROW are subject to the same requirements as Department let contracts

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  • Emuline

    2021 9 14 blasting applications requiring de coupling of the explosive charge The product can be used for pre splitting post splitting and smooth blasting applications Emuline is packaged as continuous emulsion cartridges with an attached line of 15 g/m detonating cord ADVANTAGES Emuline distributes the load uniformly through the presplit boreholes

    Get Price
  • PRESPLIT BLASTING PROCEDURES BULL RUN STEAM

    SINCE ITS DEVELOPMENT in 1958 presplit blasting has become an accepted method of obtaining essentially smooth vertical walls in rock excavation The usual technique has been to drill a line of vertical blast holes spaced from 1 to 2 ft on centers generally to the depth of the required cut These holes are loaded with charges made up of 1

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  • Blasting damage in rock

    2018 9 21 correctly designed and executed smooth blasting can be very beneficial in trimming the final excavation face Figure 1 illustrates a comparison between the results achieved by a normal blast and a face created by presplit blasting in jointed gneiss It is evident that in spite of the fairly

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  • Senatel Powersplit

    Senatel Powersplit is designed to create clean walls and is ideal for perimeter blasting trimming and pre splitting With high velocity of detonation and low decoupled energy it minimizes wall damage leaving behind a smooth profile with minimal overbreak The product contains a centrally traced robust polyester rope and an external 5m

    Get Price
  • SCI

    2021 9 26 Comparison of blast induced damage between presplit and smooth blasting of high rock slope Rock Mechanics and Rock Engineering 2013 DOI 10 1007/s00603 013 0475 7 38 Li D Q Jiang S H Chen Y G Zhou C B A comparative study of three

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  • What is double line spacing in typing AnswersToAll

    2019 7 1 Presplit blasting involves drilling a single row of holes along the back of the final excavation zone 3 Unlike smooth wall blasting the presplit holes are fired on the first delay of the production blast The presplit technique is the most commonly used controlled blasting technique for surface operations

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  • Summary of Surface Blasting and Damages with Analysis

    Comparison of Blast Induced Damage between Presplit and Smooth Blasting of High Rock Slope by Hu et al 2013 Advance of computers has allowed for more modeling techniques over the last decade This is noted by the use of numerical modeling comparing the damages of presplit and smooth blasting for the study done by Hu et al

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  • Comparison of Blast Induced Damage Between Presplit

    2013 9 14 Comparing the damage zone induced by the contour blasting itself as shown in Fig 10 the extent of high degree damage around the blast hole of smooth blasting is about 0 83 m but for the presplit blasting it is 1 1 m which is an increase by 30 compared to smooth blasting The results of the presplit blasting excavation method prove that

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  • MEGASPLIT RG Continuous Pre Split Product

    2018 4 16 designed for perimeter blasting in open pit applications APPLICATION MEGASPLIT is specifically designed for use in pre Split blasting and delivering smooth walls and a safer controlled blast It is most suited to hard rock operations where smaller diameter holes are drilled MEGASPLIT RG is suitable for use in reactive ground A formulation to

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  • Directional presplit blasting in an innovative no pillar

    Directional presplit blasting DPB technology for an innovative no pillar mining approach is introduced First a mechanical model is established to To ensure the smooth separation of the top plate of the goaf along the cutting line the cutting angle was designed to be 20

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  • Controlled blasting for enhanced safety J in the

    2011 2 7 Blasting is a daily practice on the mines and presplit is performed with decoupled charges such as the In smooth wall blasting the final row of holes contains a lighter than normal charge possibly a smaller burden and is ignited after the main charge is completed in order to limit the

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  • Chapter 8 BLAST DESIGN

    2014 6 11 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

    Get Price
  • PDF Comparison of Presplit and Smooth Blasting

    To understand differences of smooth and presplit blasting for the excavation of rock wells two field experiments using these two techniques are implemented at the same test site respectively

    Get Price
  • 2019 12 31 Research on Smooth Blasting Technology and Its Application in Tunneling C //Glossy pre splitting blasting paper compilation Numerical analysis of joint angle effect on cracking with presplit blasting J Rock and Soil Mechanics 2015 36 1 189 204

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  • Blasting damage in rock

    2018 9 21 correctly designed and executed smooth blasting can be very beneficial in trimming the final excavation face Figure 1 illustrates a comparison between the results achieved by a normal blast and a face created by presplit blasting in jointed gneiss It is evident that in spite of the fairly

    Get Price
  • MEGASPLIT RG Continuous Pre Split Product

    2018 4 16 designed for perimeter blasting in open pit applications APPLICATION MEGASPLIT is specifically designed for use in pre Split blasting and delivering smooth walls and a safer controlled blast It is most suited to hard rock operations where smaller diameter holes are drilled MEGASPLIT RG is suitable for use in reactive ground A formulation to

    Get Price
  • 2012 10 23 moothblasting undergroundcounterpart cushionblasting drift closely spaced holes burden to spacing ratio near 1 5 1 lightwell distributed charges Smooth blasting differs from cushion blasting perimeterholes lastdelay sameround primaryblast Total column loading

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  • DAYAGEL PRE SPLIT

    2021 1 22 blasting and delivering smooth walls and a safer controlled blast It is most sited to hard rock operations where the smaller diameter holes are drilled When initiating with a detonator ALWAYS attach the detonator directly to the external trace detonating cord on the DAYAGEL PRE SPLIT

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  • Copy of Rock Blasting Fundamentals

    2012 5 20 PDHonline Rock Blasting Fundamentals Slide No 27 Rock Blasting Basics zA contractor has planned a blasting program in slightly weathered Gneiss having a specific gravity of 2 6 The contractor intends to use poured ANFO having a specific gravity of 0 85 The drill hole is 3 inches in diameter What is the recommended burden distance for the

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