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  • A New Technology for Smooth Blasting without …

     · For smooth blasting, explosives were generally in the form of air-decked decoupled charges. However, explosives may self-extinguish or refuse to blast in a blasthole because of the channel effect or excessively long gap distances between explosives [].The full-length detonating cord detonation propagation method is usually used in blastholes, as shown in Figure 1.

  • Comparison Presplit and Smooth Blasting | PDF | Spectral …

     · Comparison Presplit and Smooth Blasting - Read online for free. Scribd is the world's largest social reading and publishing site. Open navigation menu. Close suggestions Search Search. en Change Language. close menu Language. English (selected) español; português; Deutsch; français;

  • Comparison of Presplit and Smooth Blasting Methods for …

    • Drilling and blasting methods have been extensively applied to rock excavation in mining and civil engineering due to its low cost, high efficiency, and easy operation. [ 1. H. Haoran, L. Wenbo, Y. Peng, C. Ming, and G. Qidong, "A vibration-isolating blast technique with shock-reflection devic…
    hindawi.com
    • : Zilong Zhou, Ruishan Cheng, Xin Cai, Jinlong Jia, Weihua Wang
    • Publish Year: 2019

    (PDF) Comparison of Presplit and Smooth Blasting Methods …researchgate.netPre-Split Techniques: A Review | Agg-Netagg-net.com(PDF) Design of controlled blasting (pre-splitting) in Golegoh…academia.eduA better way to presplit - Mining & Construction onlineminingandconstruction.…Understanding the connection between blasting and highwal…sciencedirect.com•
  • What is presplit blasting?What is presplit blasting?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. 3. Methods 3.1. Line drilling

    Understanding the connection between blasting and highwall

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     · To this end, the construction of sub-section should not block too much, excavation should be used smooth blasting, presplit blasting or mechanical tunneling. (2). In order to give full play to rock the carrying capacity should be allowed to control and rock deformation.

  • 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 …

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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 ...

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    . this end, the construction of sub-section should not block too much, excavation should be used smooth blasting, presplit blasting or mechanical tunneling. (2). In order to give full play to rock the carrying capacity should be allowed to control and rock deformation. While allowing deformation, which can be a ...

  • -Chapter6PresplittingandSm.ppt-

     · -Chapter6PresplittingandSm.ppt,* * * * Main Content Chapter 6 Presplitting and Smooth Blasting 6.1 Presplitting Blasting 6.2 Smooth Blasting 6.3 Application Condition of Presplitting and Smooth Blasting(Omitted) 6.4 Practices of

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  • Comparison of Blast-Induced Damage Between …

     · The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage …

  • Comparation of Blast-Induced Damage Between Presplit …

     · The whole of the temporary shiplock slopes of the Three Gorges damage process of the smooth blasting and presplit blasting Project in China. excavation method is studied by using a cumulative blasting damage numerical simulation technology based on Keywords High rock slope Blast-induced damage the secondary development of the dynamic finite ...

  • Pre-Split Techniques: A Review | Agg-Net

    2  · Julian Cleeton, director of Stemtek, examines the conventional and alternative methods for achieving a stable face. Pre-splitting can be defined as 'a technique using lightly charged, closely spaced holes to induce a fracture …

  • Influence of Joint Conditions and Blast Design on Pre-split …

     · Pre-splitting is a special blasting technique to achieve smooth rock surfaces. Pre-split blastholes are drilled at predefined spaces, charged with carefully planned amounts of explosive and fired before the production holes are exploded. Mainstream theories of blasting, as applied to pre-split blasting, are based on the premise that there is an ...

  • Explosives Engineers' Guide - Dyno Nobel

     · Explosives Engineers' Guide - Dyno Nobel

  • Comparison of Blast-Induced Damage Between Presplit …

    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. The results demonstrate that, in the case of contour blasting with the method of smooth blasting ...

  • Improved Blasting and Bench Slope Design at the Aitik Mine

    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 ...

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

    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 …

  • 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.

  • A better way to presplit - Mining & Construction online

     · They could be 18, 23 or 27.5 degrees, which is why a presplit rig must be very versatile. The rigs are specially designed so that the feed can be fixed at fractions of an angle. But performing presplitting on fixed angles such as 5, 10, or 15 degrees from the vertical, as is the case with the production drills, clearly makes it more ...

  • smooth blasting presplit

    Next is smooth blasting where smooth blast holes are blasted after production blasts. The procedure uses small diameter holes at close spacing and lightly loaded with distributed charges.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 . Get Price

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

    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 …

  • smooth blasting presplit - Search

    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 ...

  • Understanding the connection between blasting and

     · 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 …

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    pull trough; trench excavated excavation of side wall at intervals controlled blasting smooth blasting presplit blasting side wall first lining method arch first lining method; flying arch ...

  • -Chapter6PresplittingandSm.ppt-

     · -Chapter6PresplittingandSm.ppt,* * * * Main Content Chapter 6 Presplitting and Smooth Blasting 6.1 Presplitting Blasting 6.2 Smooth Blasting 6.3 Application …

  • Comparison of Blast-Induced Damage Between Presplit …

     · 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. The results demonstrate that, in the case of contour blasting with the method of smooth blasting ...

  • 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, …

  • PDF - Comparison of Presplit and Smooth Blasting …

    PDF - 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 - chinamedicine.eu

    Comparison of Blast-Induced Damage Between Presplit . 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.

  • 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, …

  • Comparison of Blast-Induced Damage Between Presplit …

     · 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 …

  • [13] HU Y G,LU W B,CHEN M,et al.Comparison of blast-induced damage between presplit and smooth blasting of high rock slope[J].Rock Mechanics & Rock Engineering,2014,47(4):1 307-1 320.