smooth blasting presplit

  • Paper Improved Blasting and Bench Slope Design at the

    The detrimental effects of small-scale structures could be controlled through lighter smooth blasting whereas the impact of larger more dominant structures prevailed even for very light smooth (for open pit operations) blasting. For the footwall presplit blasting in inclined (70°) holes over the full double-bench height proved to be

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  • ComparisonofPresplitandSmoothBlastingMethodsfor

    2019-1-20 · To minimize and reduce these problems presplit and smooth blasting as the advanced control techniqueshavebeenwidelyintroducedintoblastingdesign 11–13 .Intheblastdesignofrockwellsortunnels presplit and smooth blasting both need to drill a circle of small spacingboreholesalongthedesignedcontourline as

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  • smooth blasting presplitakademiaepsilon.pl

    smooth blasting presplit randpic Summary of Surface Blasting with Comparison of Two 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 Smoo

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  • Safety threshold of blasting vibration velocity in

    2020-6-19 · Blasting damage control is one of the main problems in the dam foundation excavation of Baihetan Hydropower Station and it is important to study the relationship between the blasting vibration and blasting damage. In this paper a horizontal presplit blasting experiment was carried out at the dam foundation. By combining vibration monitoring and sonic wave detection before and after blasting

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  • Comparison of Blast-Induced Damage Between Presplit and

    2013-9-14 · Comparing the presplit blasting and smooth blasting holes they have similar charge structures and blasting parameters so the peak value and rise time of the blasting load are almost the same. However the burden of presplit blasting is much greater than that of smooth blasting

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  • Pre-Split Blast Design For Open-Pit And Underground Mines

    SYNOPSIS Perimeter blasting techniques limit damage to the final walls of excavations. This is accomplished by lowering the explosive energy concentration of the excavation boundary. The most common method is pre-splitting which involves the formation of a crack coincident with the excavation boundary prior to firing the main blast.

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  • Comparison of Blast-Induced Damage Between Presplit and

    This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS-DYNA.

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  • FINAL WALL STABILITY IN METAL OPEN PIT MINES USING

    2016-9-19 · The common controlled blasting techniques are line smooth cushion and presplit blasting. The latter technique has become the most widely used in metal open pit mines due to good results and its operational nature in hard rock formation. PRESPLIT BLASTING Presplit blasting is an effective technique for stabilizing the final wall in open pit

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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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  • Case Study Controlled Vibration Blasting

    2011-8-4 · a presplit line was run along the back of the blast on the side closest to the structure. This served two purposes since it was a final wall blast it helped to create a smooth wall and the crack produced from barrier against transmitting blast vibration towards the structures. Where R

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  • Comparison of Blast-Induced Damage Between Presplit and

    Abstract This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS

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  • Comparison of Blast-Induced Damage Between Presplit and

    Abstract This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS

    Get Price
  • Chapter 8 BLAST DESIGNNPS

    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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  • Senatel™ PowersplitOrica

    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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  • Case Study Controlled Vibration Blasting

    2011-8-4 · a presplit line was run along the back of the blast on the side closest to the structure. This served two purposes since it was a final wall blast it helped to create a smooth wall and the crack produced from barrier against transmitting blast vibration towards the structures. Where R

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  • Numerical and experimental investigation of blasting

    2018-4-10 · The presplit-smooth blasting approach inherits the advantages of both presplit and smooth blasting and improved the blasting damage control effect significantly. The emphasis of this study is to evaluate the differences in the damage processes of the smooth and presplit blasting methods.

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  • Comparison of Blast-Induced Damage Between Presplit and

    This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS-DYNA.

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  • Resolution of Some Common Problems Highway Blasting

    Smooth blasting minimizes the danger of displacing the rock mass until each successive portion has been fragmented during the planned blasting sequence. It is possible also to lessen the tendency of presplitting to displace rock by introducing more delays into the blast. The­ oretical considerations suggest that it is necessary to detonate

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  • Explosives Engineers Guide

    2020-4-22 · Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)

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  • Case Study Controlled Vibration Blasting

    2011-8-4 · a presplit line was run along the back of the blast on the side closest to the structure. This served two purposes since it was a final wall blast it helped to create a smooth wall and the crack produced from barrier against transmitting blast vibration towards the structures. Where R

    Get Price
  • controlled blasting.PDFWall Control(construction by

    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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  • WALL CONTROL BLASTING AT THE ORPHAN BOY MINE

    2020-1-29 · control blasts comprising of three smooth blasts and one presplit blast were conducted at the Orphan Boy Mine (an underground mine at Montana Tech). Based on the half-barrels that resulted the success of the three smooth blasting was less than 20 . The presplit blasting resulted in extensive fracturing of the adjoining rock mass.

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  • Comparison of Blast-Induced Damage Between Presplit and

    This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS-DYNA.

    Get Price
  • FINAL WALL STABILITY IN METAL OPEN PIT MINES USING

    2016-9-19 · The common controlled blasting techniques are line smooth cushion and presplit blasting. The latter technique has become the most widely used in metal open pit mines due to good results and its operational nature in hard rock formation. PRESPLIT BLASTING Presplit blasting is an effective technique for stabilizing the final wall in open pit

    Get Price
  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

    2006-3-22 · Smooth Blasting The back holes are fired last as usual relying on a reduced charge mass per hole for overbreak control. The South African Institute of Mining and Metallurgy International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering

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  • Explosives Engineers Guide

    2020-4-22 · Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)

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  • Comparison of Presplit and Smooth Blasting Methods for

    Abstract