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  • ITEM 208 ROCK BLASTING Ohio Department of Transportation

    In rare instances, the Department will specify presplitting for 1 to 1 slopes. For all slopes that do not require controlled blasting techniques, rake, excavate, hoe ram, or mechanically shape these slopes to obtain a neat and smooth appearance. Production blasting refers to the rock fragmentation blasts resulting from more 

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  • Back to Basics iseegoldenwest

    by intercepting cracking (backbreak) from subsequent detonating production holes. NOTE: A presplit crack has little or no effect in reducing vibration from subsequent blasts and, in fact, the presplitting blast creates more vibration per unit of explosive weight than many other forms of blasting. Smoothblasting A cautious 

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  • crack interaction mechanism of presplit rock blasting

    Presplit or smooth blasting is used to produce a fine cut surface in hard rock by simultaneous blasting of usually small, closely placed blastholes, e.g., [14]. Currently the parameters of this method are chosen based on experience or physical modelling on rock samples or artificial materials, e.g.,[1], [5], rather than on an.

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  • Drilling and blasting Wikipedia

    Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam or road construction. The result of rock blasting is often known as a rock cut. Drilling and 

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  • Controlled blasting and its impliions for the NNWSI project

    CONTROLLED BLASTING AND ITS IMPLICATIONS. FOR THE NNWSI PROJECT EXPLORATORY SHAFT by. Edward M. Van Eeckhout. ABSTRACT. This report reviews controlled blasting techniques for shaft sinking. Presplitting and smooth blasting are the techniques of principal interest. Smooth blasting is preferred for 

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  • 16 Blasting damage in rock AGH

    On the other hand, if the entire blast has been correctly designed and executed, smooth blasting can be very beneficial in trimming the final excavation face. Figure 16.1 illustrates a comparison between the results achieved by a normal blast and a face created by presplit blasting in a jointed gneiss. It is evident that, in spite 

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  • Comparison of BlastInduced 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 

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  • LA11097MS, "Controlled Blasting and Its Impliions for the NRC

    Presplitting and smooth blasting are the techniques of principal interest. Smooth blasting is preferred for the Nevada Nuclear Waste Storage In vestigations exploratory shaft. Shaft damage can be monitored visually or by peak velocity measurements and refractive techniques. Damage into the rock should be limited to 3 ft.

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  • Download PDF Bentham Open

    Mar 21, 2017 models for blasting vibration safety criteria are proposed based on the ultimate tensile stress criterion, the ultimate shear stress criterion and the .. Y. Hu, W. Lu, M. Chen, P. Yan, and J. Yang, "Comparison of blastinduced damage between presplit and smooth blasting of high rock slope" Rock Mech.

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  • Explosives Engineers' Guide Dyno Nobel

    D/10 to D/20 (Angular material with minimum fines). 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.

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  • Techniques of Controlled Blasting Presentation Transcript SANIRE

    Presplitting is resorted to when there is a requirement to control the overbreak after blasting beyond a certain zone thereby ensuring smooth breakage up to the desired line. It is also done to minimize the impact of ground vibrations on the other side of the presplit line. The charges in presplit holes are fired in advance of 

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  • Chapter 9 GENERAL ROCK REMOVAL National Park Service

    blasting techniques in use today are: presplitting, smooth blasting, cushion blasting, and line drilling. PRE achieve 100 to 200 milliseconds between presplit row detonation and main blast detonation. fragmented burden between the presplit and adjacent main blast rows will not be cast away from the excavation.

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  • Comparison of BlastInduced 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

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  • Blaster's Training Modules Module 3 Surface Blast OSMRE

    BlastDesign Overview. Blast parameters: Burden. Spacing. Bench height. Powder column: Hole diameter. Hole depth. Powder factor. Subdrilling. Stemming. Controlled blasting techniques: Line drilling. Presplitting. Smooth blasting. Cushion blasting. Measurements and calculations: Loading density.

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  • Blasting and Explosives Quick Reference Guide 2010

    D/10 to D/20 (Angular material with minimum fines). 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.

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  • Engineering Geology Field Manual Bureau of Reclamation

    Smooth blasting, also called contour blasting, perimeter blasting, or sculpture blasting, is the most widely used method of controlling overbreak in underground openings such as drifts and stopes (benches). Smooth blasting is similar to presplitting in that an additional row of holes is drilled at the perimeter of the excavation.

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  • Techniques of Controlled Blasting by Partha D Sharma

    Adopting various techniques of controlled blasting such as Line drilling, Trim (Cushion) blasting, smooth (contour or perimeter) blasting, presplitting etc, Thus, adopting airdecks (preferably by using airbags) in presplit holes, for mega / cast blasts in open pit mines minimizes overbreak, ground vibration etc., to a great 

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  • Controlling High Risk Blasting in an Urban Orica Mining Services

    The floodwall blast was successfully executed, leaving behind a smooth presplit that would form the final breakthrough of the northern tunnel into the open construction site. This tunnel would then link the northern suburbs to the tunnel system that directed traffic towards the CBD and Airport precincts. The blasting contractor 

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  • Techniques of Controlled Blasting SlideShare

    Dec 17, 2009 Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Presplitting, Some of the shock waves from subsequent main blast are reflected at the presplit plane which results in arresting a considerable portion of blast induced ground 

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  • Precision Presplitting: The Basics Rock Products

    May 26, 2016 Using this method, even weak siltstones can be presplit to form smooth, solid walls. In the previous example the blaster decided to try this new technique of precision presplitting. He again had a 35ft. highwall and a drill rig that could drill a 3in. hole. With precision presplitting that typical spacing used was 

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  • Blasting and Explosives Quick Reference Guide 2010

    D/10 to D/20 (Angular material with minimum fines). 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.

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  • Download as PDF IntechOpen

    Apr 4, 2012 According to Holmberg and Persson (1978), the spacing of presplit holes should be 812 times the blast hole diameter. The following design parameters for contour hole spacing, burden to spacing ratio of contour holes and linear charge concentration in smooth blasting are suggested by Holmberg (1982) 

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  • Improved Blasting and Bench Slope Design at the Aitik DiVA portal

    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 doublebench height, proved to be suitable in terms of both achievable bench slope geometry, and production concerns. For the hangingwall, a presplit 

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  • 877747ROCK NQS Rock Drilling and Blasting: Technical Blasting

    We offer a wide variety of technical blasting services including, but certainly not limited to: Presplit Blasting: For a smooth and stable finish Closein Controlled Blasting: For densely populated, spatially constricted, or high traffic areas. Trench Blasting Rock Stabilization. Let us create your customized blasting solution today.

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  • Summary of Surface Blasting with Comparison of Geoengineer

    University of Michigan. Summary of Surface Blasting with Comparison of Two Mitigation Techniques Presplitting and Smooth Blasting. Prepared by: Charles Krolikowski. With the Support of: Overview. 1.0 Introduction 2.0 Mechanics of Rock Blasting 3.0 Types of Blasting 4.0 Typical Components and Terms of Blasting 

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  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL SAIMM

    by AEL and other organisations to create a presplit design which delivers a stable highwall for the life of that . Smooth Blasting: The back holes are fired last as usual, relying on a reduced charge mass per hole for Postsplitting: As with Smooth Blasting, but the back holes are simultaneously initiated in a separate blast.

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  • Rock fragmentation control in opencast blasting ScienceDirect

    While shooting with the dip, backbreak increases, toe problem decreases resulting in a smooth floor, and throw of the blast increases resulting in stered and low muck pile (Fig. 1a). When shooting against the dip, there are less backbreak, more toe problems resulting in uneven floor, and decreasing throw of the blast 

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  • Blasting Holes Drilled in Granite Rock YouTube

    Apr 7, 2016 This video shows the drill holes that were made in the granite, so they could put dynamite in the holes to blast the rock. The result of rock blasting is often known as a Rock Cut. Rock surface newly blasted, this is called presplit, it's a technique to leave a smooth face. Elevation of this rock cut was about 

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  • Techniques of Controlled Blasting SlideShare

    Dec 17, 2009 Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Presplitting, Some of the shock waves from subsequent main blast are reflected at the presplit plane which results in arresting a considerable portion of blast induced ground 

    Online
  • Assessment and Appliion of a SingleCharge Blast Test at CDC

    Methods, such as line drilling, presplitting, cushion blasting, fracture control blasting, and smooth blasting are successfully used in civil tunneling operations (Lizotte 1994, Olofsson 1990) but, they are less often used in the mining industry because of perceived additional costs and the expected life of underground openings 

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