smooth blasting presplit

  • Case Study Controlled Vibration Blasting

     · 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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  • How to Carry out Controlled Blasting of Rocks PDF How

    3. Smooth Blasting. This method is widely accepted for controlling overbreak in canal underground headings a nd slopes. In smooth blasting the holes are drilled along the excavation limits lightly loaded with well-distributed charges and fired at the end of the round.

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  • Comparison of Blast-Induced Damage Between Presplit and

     · 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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  • 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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  • Numerical and experimental investigation of blasting

     · 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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     ·  smooth blasting presplit blasting

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  • 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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  • 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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  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

     · 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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  • 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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     ·  smooth blasting presplit blasting

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  • 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

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  • ComparisonofPresplitandSmoothBlastingMethodsfor

     · 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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  • A better way to presplitMining Construction online

     · With ROC rigs presplit holes can always be drilled as planned. Furthermore ROC rigs are not just better at presplit drilling they can also be used for a variety of other tasks such as leveling benches for the large rigs complementary drilling of buffer holes up to 203 mm drilling long horizontal dewatering holes or using the Reverse

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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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  • WALL CONTROL BLASTING AT THE ORPHAN BOY MINE

     · 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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  • CHAPTER 3ROCK EXCAVATION METHODS Asad Aijaz

    Each type of blasting—presplit smooth and cushion blasting—has its own formula. Presplit Blasting As discussed above presplit blasting (or presplitting) is most often done before production blasting to create a secondary fracture plane that will protect the final slope face from damage in the main production blast.

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  • Safety threshold of blasting vibration velocity in

     · 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

    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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  • Numerical and experimental investigation of blasting

     · The presplit-smooth blasting was verified that it could inherit the advantages of presplit and smooth blasting. Abstract The disturbance of a rock mass due to blasting impact and stress redistribution can significantly affect the overall performance of an excavation.

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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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  • Case Study Controlled Vibration Blasting

     · 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

    Chat Online
  • 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

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  • 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)

    ComparisonofPresplitandSmoothBlastingMethodsfor

     · 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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  • 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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  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

     · simultaneously creating a split between the blasting zone and the proposed sidewalls. Smooth Blasting The back holes are fired last as usual relying on a reduced charge mass per hole for overbreak control.

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  • How to Carry out Controlled Blasting of Rocks PDF How

    3. Smooth Blasting. This method is widely accepted for controlling overbreak in canal underground headings a nd slopes. In smooth blasting the holes are drilled along the excavation limits lightly loaded with well-distributed charges and fired at the end of the round.

    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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  • PROCEDURES FOR BLASTING

     · 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.

    POCKET BLAST GUIDEorica.psrstore.au

     · in presplit and smooth blasting Rock type PF (kg/m3) Rock type PF (kg/m2) Strong 0.81.2 Strong 0.60.9 Medium 0.60.8 Medium 0.40.5 Soft 0.40.6 Soft 0.20.3 Very Soft < 0.4 Typical Powder Factors used in Production Blasts

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