• Rock Slopes dot.state.mn.us

    Rock Slopes dot.state.mn.us

    In hard rock, blasting of the slope will likely be required. MnDOT specifiion 2105.3C requires presplitting of hard rock types for any cut slope steeper than 1H:1V. Presplitting of these low cut faces is not necessary from a rockfall standpoint, but will result in a clean, durable rock face that does not deviate significantly

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  • ITEM 208 ROCK BLASTING

    ITEM 208 ROCK BLASTING

    Controlled blasting techniques include presplitting, cushion (trim) blasting, and sliver cut blasting. If the designed cut slope is steeper than 1:1 and deeper than 5 feet (1.5 m), use controlled blasting techniques, even if the main excavation is ripped or excavated.

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  • Out With the Old, in With the New: The Modern Method of

    Out With the Old, in With the New: The Modern Method of

    Jan 13, 2020 · The rock properties are also critical including Young''s Modulus, Tensile Strength, Compressive Strength and Joint Frequency. Since the 1980s, a method of presplitting termed Precision Presplitting has been utilized around the world to properly design presplit blasts.

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  • Engineering Geology Field Manual Volume II 2nd Ed

    Engineering Geology Field Manual Volume II 2nd Ed

    The hardness or brittleness of rock can have a significant effect on blasting results. If soft rock is slightly underblasted, the rock probably will still be excavatable. If soft rock is slightly overblasted, excessive violence will not usually occur. On the other hand, slight underblasting of hard rock

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  • Presplitting excavation technique Britannica

    Presplitting excavation technique Britannica

    In tunnels and underground excavations: Soundwall blasting met by the technique of presplitting, developed in the United States in the late 1950s. Basically, this technique consists of creating a continuous crack (or presplit) at a desired finished excavation line by initially firing a line of closely spaced, lightly loaded holes drilled there.

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  • Precision Presplitting – Design Aspects Rock Products

    Precision Presplitting – Design Aspects Rock Products

    Jun 13, 2016 · Precision Presplitting is a form of presplitting where the blast design is based on the rock properties and rock mechanics. The differences between normal presplitting and precision presplitting were discussed in the previous article (Konya & Konya, Precision Presplitting

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  • Drilling and blasting Wikipedia

    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, tunnel or road construction. The result of rock blasting is often known as a rock

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  • Drill & Blast 101 YouTube

    Drill & Blast 101 YouTube

    Apr 03, 2013 · Get YouTube without the ads. Working Skip trial 1 month free. Find out why Close. Drill & Blast 101 Mark Bowater. Rock Blasting Demo Duration: 3:10. crossmyroad 89,640 views.

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  • Design and Appliion of Blasting Parameters for

    Design and Appliion of Blasting Parameters for

    Empty holes have been successfully applied to rock presplitting for unloading, blasting excavation of rock drift, and gas extraction from gasrich coalbeds [6–8]. There have been extensive studies on investigating the mechanism of the dynamic behavior for blasting crack propagation as well as the tension crack and guiding role of empty holes

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  • Construction Planning, Equipment, CHAPTER BLASTING ROCK

    Construction Planning, Equipment, CHAPTER BLASTING ROCK

    CHAPTER 13. BLASTING ROCK ENCE 420 ©Assakkaf Slide No. 20 ANFO ANFO is an explosive used extensively on construction projects. Texas City, 16 April 1947 CHAPTER 13. BLASTING ROCK ENCE 420 ©Assakkaf Slide No. 21 ANFO The ANFO is made by blending 3.5 quarts of fuel oil with 100 lb of ammonium nitrate blasting prills This the optimum ratio.

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  • The Mechanics Of PreSplitting In Discontinuous Rock

    The Mechanics Of PreSplitting In Discontinuous Rock

    INTRODUCTION Presplit blasting is a technique used to reduce damage to excavation profiles during blasting by preforming a continuous fracture between parallel boreholes lightly charged with decoupled explosives along the line of the required surf The Mechanics Of PreSplitting In Discontinuous Rock Authors P.N. Worsey (Department of

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  • Precision Presplitting: The Basics Rock Products

    Precision Presplitting: The Basics Rock Products

    May 26, 2016 · precision presplitting is being used in the blasting industry to increase safety and prevent overbreak in weaker rocks. By Anthony J. Konya and Calvin J. Konya This is the first in a twopart article about Precision Presplitting.

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  • (PDF) Design of controlled blasting (presplitting) in

    (PDF) Design of controlled blasting (presplitting) in

    Design of controlled blasting (presplitting) in Golegohar iron ore mine, Iran Design of controlled blasting blasting technique is an effective way to minimize damage to remaining rock by

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  • Case Study Cost Reduction in Wall Control Blasting

    Case Study Cost Reduction in Wall Control Blasting

    requires strict wall control blasting techniques to ensure the walls are both safe and cut to design angle. Presplitting is carried out in both transitional (Fig 2) and fresh rock (Fig 4), with trim blasting employed to further reduce the damage to the walls. resultsBrownzewing Gold

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  • PRESPLITTING TECHNIQUES IN ROCK EXCAVATION TRID

    PRESPLITTING TECHNIQUES IN ROCK EXCAVATION TRID

    a comparatively new development in alabama rock excavation methods, rock presplitting is discussed. this method of blasting to control cut slopes is described, including specifiions and variations in drill hole size, depth and oncenter spacing, explosives and stemming.

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  • Study on Presplitting Blasting the Roof Strata of Adjacent

    Study on Presplitting Blasting the Roof Strata of Adjacent

    In order to solve the problem of roadway deformation based on the theory of "short cantilever beam by roof cutting," the method of "pressure relief by roof cutting in the adjacent roadway" is proposed. Through presplitting blasting the roadway hard rock layer, the stress propagation path is cut off, and the surrounding rock stress environment of the roadway is improved, to achieve the

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  • Surface Mine Blasting Office of Surface Mining

    Surface Mine Blasting Office of Surface Mining

    SURFACE MINE BLASTING Proceedings: Bureau of Mines Technology Transfer Seminar, Chicago, IL, April 15, 1987 Compiled by Staff, Bureau of Mines ABSTRACT The Bureau of Mines has sponsored a comprehensive research program to enhance the safe, effective, and efficient use of blasting technology by the mining industry.

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  • FHWA Center for Local Aid Support Publiions

    FHWA Center for Local Aid Support Publiions

    Presplit blasting, or presplitting, is used before production blasting to protect the final rock face from damage caused by the production blasting. Presplitting creates a fracture plane along the final slope face, which prevents the radial cracks created by production blasting from penetrating into the finished face without presplitting

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  • Consulting – Konya Industries

    Consulting – Konya Industries

    Rock Blasting Consulting. Konya Industries is a stateoftheart, worldwide consulting firm in explosives and rock blasting. Our rock blasting consultants have worked on every continent in over 50 countries with both mining and construction activities.

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  • Definition of presplitting glossary

    Definition of presplitting glossary

    rock blasting presplitting: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 tunnel or road construction The result of rock blasting is often known as a rock . More Detail

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  • 208 Rock Blasting Pages

    208 Rock Blasting Pages

    208 Rock Blasting. Specifiion Changes. General Information. Rock Blasting Basics. Presplitting (208.09) Specifiion Changes. New item (formally Supplemental Specifiion 878). The minimum length of the holes for the test section was changed to 20 feet. The maximum hole diameter increased from 6 to 6 ¼ inches.

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  • presplitting – Mining and Blasting

    presplitting – Mining and Blasting

    Jan 01, 2011 · Posts about presplitting written by PARTHA DAS SHARMA. Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting .

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  • presplitting – Mining and Blasting

    presplitting – Mining and Blasting

    Jan 01, 2011 · Posts about presplitting written by PARTHA DAS SHARMA. Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting .

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  • Blasting and Explosives Quick Reference Guide 2010

    Blasting and Explosives Quick Reference Guide 2010

    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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  • Presplitting in Wet Ground – Techniques and Design

    Presplitting in Wet Ground – Techniques and Design

    Presplitting in Open Cut Coal Mining 2 • Presplits are a blasting technic to aid in the creation of safe stable highwallsessential for open cut mining operations • The aim of a presplit is to create a fracture plane within the rock along what will be the future highwall • This discontinuity will then intercept the radial cracking and gas

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  • Techniques of Controlled Blasting SlideShare

    Techniques of Controlled Blasting SlideShare

    Dec 17, 2009 · Techniques of Controlled Blasting 1. Muffle blasting: Flyrock is another important adverse impact of blasting operations, specially, when conducted in the vicinity of dense human habitation / congested areas. Muffling or covering of blast holes properly before blasting, is the common solution to prevent flyrock from damaging human

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  • Summary of Surface Blasting and Damages with Analysis of

    Summary of Surface Blasting and Damages with Analysis of

    Mar 24, 2015 · A similar form of protective blasting is presplit blasting. Presplitting has the intention of forming a free face barrier, between rock to be removed and rock that is too remain, by detonating a row of lightly packed charges prior to the main blasts along the final contour face.For a comparison with regular blasting, Figure 5.3 is a good

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  • PRESPLITTING TECHNIQUES IN ROCK EXCAVATION TRID

    PRESPLITTING TECHNIQUES IN ROCK EXCAVATION TRID

    a comparatively new development in alabama rock excavation methods, rock presplitting is discussed. this method of blasting to control cut slopes is described, including specifiions and variations in drill hole size, depth and oncenter spacing, explosives and stemming.

    Get Price
  • Jg CHAPTER BLASTING ROCK •Department

    Jg CHAPTER BLASTING ROCK •Department

    BLASTING ROCK . ofEngineering "Blasting" is performed to break rock so that it may be quarried for processing in an aggregate production operation, or to Trench rock [2]Presplitting [2]Production . Face Bench height Burden distance Spacing Blasthole depth Stemming

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  • Drilling and Blasting Introduction YouTube

    Drilling and Blasting Introduction YouTube

    Nov 14, 2011 · Shot, Edit, Voiced, Produced An Introduction to Drilling and Blasting in the Construction Industry

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  • Techniques of Controlled Blasting SlideShare

    Techniques of Controlled Blasting SlideShare

    Dec 17, 2009 · Techniques of Controlled Blasting 1. Muffle blasting: Flyrock is another important adverse impact of blasting operations, specially, when conducted in the vicinity of dense human habitation / congested areas. Muffling or covering of blast holes properly before blasting, is the common solution to prevent flyrock from damaging human

    Get Price
  • Case Study Cost Reduction in Wall Control Blasting

    Case Study Cost Reduction in Wall Control Blasting

    requires strict wall control blasting techniques to ensure the walls are both safe and cut to design angle. Presplitting is carried out in both transitional (Fig 2) and fresh rock (Fig 4), with trim blasting employed to further reduce the damage to the walls. resultsBrownzewing Gold

    Get Price
  • rock blasting presplitting spurghicarminati.it

    rock blasting presplitting spurghicarminati.it

    rock blasting presplitting PRESPLITTING ROCK IN THE PRESENCE OF A STATIC STRESS . Preliminary tests on presplitting rock in the presence of an in situ static stress field were undertaken to study the influence of a horizontal static stress field on the creation of a vertical presplit fracture plane.

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  • Out With the Old, in With the New: The Modern Method of

    Out With the Old, in With the New: The Modern Method of

    Jan 13, 2020 · The rock properties are also critical including Young''s Modulus, Tensile Strength, Compressive Strength and Joint Frequency. Since the 1980s, a method of presplitting termed Precision Presplitting has been utilized around the world to properly design presplit blasts.

    Get Price
  • Construction Planning, Equipment, CHAPTER BLASTING ROCK

    Construction Planning, Equipment, CHAPTER BLASTING ROCK

    CHAPTER 13. BLASTING ROCK ENCE 420 ©Assakkaf Slide No. 20 ANFO ANFO is an explosive used extensively on construction projects. Texas City, 16 April 1947 CHAPTER 13. BLASTING ROCK ENCE 420 ©Assakkaf Slide No. 21 ANFO The ANFO is made by blending 3.5 quarts of fuel oil with 100 lb of ammonium nitrate blasting prills This the optimum ratio.

    Get Price
  • 208 Rock Blasting Pages

    208 Rock Blasting Pages

    208 Rock Blasting. Specifiion Changes. General Information. Rock Blasting Basics. Presplitting (208.09) Specifiion Changes. New item (formally Supplemental Specifiion 878). The minimum length of the holes for the test section was changed to 20 feet. The maximum hole diameter increased from 6 to 6 ¼ inches.

    Get Price
  • Precision Presplitting – Design Aspects Rock Products

    Precision Presplitting – Design Aspects Rock Products

    Jun 13, 2016 · Precision Presplitting is a form of presplitting where the blast design is based on the rock properties and rock mechanics. The differences between normal presplitting and precision presplitting were discussed in the previous article (Konya & Konya, Precision Presplitting

    Get Price
  • PRESPLITTING ROCK SLOPES FOR HIGHWAYS TRID

    PRESPLITTING ROCK SLOPES FOR HIGHWAYS TRID

    presplitting rock slopes for highways. the presplitting method of producing a plane of split rock along the face of the slope prior to any primary drilling or blasting is described.

    Get Price
  • Study on Presplitting Blasting the Roof Strata of Adjacent

    Study on Presplitting Blasting the Roof Strata of Adjacent

    In order to solve the problem of roadway deformation based on the theory of "short cantilever beam by roof cutting," the method of "pressure relief by roof cutting in the adjacent roadway" is proposed. Through presplitting blasting the roadway hard rock layer, the stress propagation path is cut off, and the surrounding rock stress environment of the roadway is improved, to achieve the

    Get Price
  • Pre splitting Granite with det cord YouTube

    Pre splitting Granite with det cord YouTube

    Apr 19, 2018 · Neatly taking the edge of a large granite boulder. 10 Extreme Dangerous Idiots Excavator Operator Skill Fastest Climbing Excavator Machines Driving Duration: 10:28. BIG Machines Recommended

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  • Study on Presplitting Blasting the Roof Strata of Adjacent

    Study on Presplitting Blasting the Roof Strata of Adjacent

    In order to solve the problem of roadway deformation based on the theory of "short cantilever beam by roof cutting," the method of "pressure relief by roof cutting in the adjacent roadway" is proposed. Through presplitting blasting the roadway hard rock layer, the stress propagation path is cut off, and the surrounding rock stress environment of the roadway is improved, to achieve the

    Get Price
  • FHWA Center for Local Aid Support Publiions

    FHWA Center for Local Aid Support Publiions

    Presplit blasting, or presplitting, is used before production blasting to protect the final rock face from damage caused by the production blasting. Presplitting creates a fracture plane along the final slope face, which prevents the radial cracks created by production blasting from penetrating into the finished face without presplitting

    Get Price
  • Rock Blasting and Overbreak Control – Konya Industries

    Rock Blasting and Overbreak Control – Konya Industries

    Having worked in and around rock blasting, or having taken other college level courses is a useful background and can help attendees understand some concepts better, but is not required. This course starts from the basics and teaches the practical methods of rock blasting and optimization of a program for better fragmentation, lower vibration

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  • Road Cut drilling, presplitting and Blasting Dykon Blasting

    Road Cut drilling, presplitting and Blasting Dykon Blasting

    Presplitting is often used to control the highwalls. Millions of pounds of explosives are used every year for this. Dykon Blasting Corp. is a rock blasting contractor and offers drilling and blasting programs for all these highway projects both large and small.

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  • Design and Appliion of Blasting Parameters for

    Design and Appliion of Blasting Parameters for

    Empty holes have been successfully applied to rock presplitting for unloading, blasting excavation of rock drift, and gas extraction from gasrich coalbeds [6–8]. There have been extensive studies on investigating the mechanism of the dynamic behavior for blasting crack propagation as well as the tension crack and guiding role of empty holes

    Get Price
  • Definition of presplitting glossary

    Definition of presplitting glossary

    rock blasting presplitting: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 tunnel or road construction The result of rock blasting is often known as a rock . More Detail

    Get Price
  • PRESPLITTING ROCK SLOPES FOR HIGHWAYS TRID

    PRESPLITTING ROCK SLOPES FOR HIGHWAYS TRID

    presplitting rock slopes for highways. the presplitting method of producing a plane of split rock along the face of the slope prior to any primary drilling or blasting is described.

    Get Price
  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

    A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

    The perimeter blasting technique used depends on the rock type. Blasting of weak, highly fissured ground requires a more conservative design than blasting in tough massive rock. Blasthole patterns and charge loads will therefore change appreciably with the rock properties encountered.

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  • blasting presplitting ilguardacielo.it

    blasting presplitting ilguardacielo.it

    Presplit blasting, or presplitting, is used before production blasting to protect the final rock face from damage caused by the production blasting. Presplitting creates a fracture plane along the final slope face, which prevents the radial cracks created by production blasting from penetrating into the finished face without presplitting

    Get Price
  • blasting presplitting ilguardacielo.it

    blasting presplitting ilguardacielo.it

    Presplit blasting, or presplitting, is used before production blasting to protect the final rock face from damage caused by the production blasting. Presplitting creates a fracture plane along the final slope face, which prevents the radial cracks created by production blasting from penetrating into the finished face without presplitting

    Get Price