smooth blasting presplit -

  • (PDF) Comparison of Presplit and Smooth Blasting Methods ...

    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.

  • [PDF] Comparison of Presplit and Smooth Blasting Methods ...

    23-04-2019 · 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

  • smooth blasting presplit - adca.be

    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.

  • Understanding the connection between blasting and highwall ...

    01-01-2019 · Presplit blasting involves drilling a single row of holes along the back of the final excavation zone . 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. 3. Methods3.1. Line drilling

  • 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.

  • Comparison of Blast-Induced Damage Between Presplit and ...

    14-09-2013 · 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, as shown in Fig. 13 .

  • Summary of Surface Blasting and Damages with Analysis of ...

    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.

  • Explosives Engineers’ Guide

    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)

  • Techniques of Controlled Blasting - SlideShare

    17-12-2009 · 4. Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Pre-splitting, Selecting and employing various parameters of blast design, using modern technology, Precise and accurate timing delays, Muffle blasting at critical and congested areas. 4. 5.

  • [PDF] Comparison of Presplit and Smooth Blasting Methods ...

    23-04-2019 · 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

  • smooth blasting presplit - adca.be

    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.

  • ComparisonofPresplitandSmoothBlastingMethodsfor ...

    20-01-2019 · 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.

  • Summary of Surface Blasting and Damages with Analysis of ...

    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.

  • 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

  • Techniques of Controlled Blasting - SlideShare

    17-12-2009 · 4. Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Pre-splitting, Selecting and employing various parameters of blast design, using modern technology, Precise and accurate timing delays, Muffle blasting at critical and congested areas. 4. 5.

  • Explosives Engineers’ Guide

    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)

  • FINAL WALL STABILITY IN METAL OPEN PIT MINES USING ...

    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 ...

  • Rock blasting for mining - SlideShare

    28-07-2017 · 85 Explosive Charge Depending upon the rock characteristics and spacing used for the presplit, charge loads will vary. Smooth Blasting The term “smooth blasting” refers to lightly loaded holes that have been drilled along excavation limits and are shot after the main excavation is removed. 86.

  • A better way to presplit - Mining & Construction online

    03-08-2011 · A fleet consisting of large drills and ROC rigs is, in my view, the most optimal presplit and blast hole solution on the market. And in these tight economic times when it is important to keep operating costs at rock bottom, this is one area in the mining process where fortunes can be saved.

  • smooth blasting presplit - adca.be

    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.

  • 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.

  • Numerical and experimental investigation of blasting ...

    10-04-2018 · Because the conventional presplit and smooth blasting methods cannot achieve ideal damage control, a combination presplit-smooth blasting method was proposed. The key to the optimized approach is the application of different contour blasting methods at different positions, allowing the advantages of both presplit and smooth blasting methods to be

  • 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

  • Explosives Engineers’ Guide

    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)

  • FINAL WALL STABILITY IN METAL OPEN PIT MINES USING ...

    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 ...

  • A better way to presplit - Mining & Construction online

    03-08-2011 · A fleet consisting of large drills and ROC rigs is, in my view, the most optimal presplit and blast hole solution on the market. And in these tight economic times when it is important to keep operating costs at rock bottom, this is one area in the mining process where fortunes can be saved.

  • DynoSplit Dynosplit Explosive Aluminium Wire Clip ...

    DynoSplit PRO has been specifically designed for perimeter control blasting where a continuous length of decoupled charge is required. It can be used in smooth wall blasting, trim and pre-split for final pit walls, high walls, construction cuts and

  • Senatel™ Powersplit - Orica

    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 ...

  • Improved Blasting and Bench Slope Design at the Aitik Mine

    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