16 blasting damage in rock

  • (PDF) Blast damage control in jointed rock mass

    Considerable efforts have been made to study the rock damages due to blasting and also to minimize damage for last many years in conventional blasting 3 4 5 6 . But very scanty work has been

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  • Estimating extent and properties of blast-damaged zone

    2. Rock blasting theory. According to a new rock blasting theory Torbica and Lapcevic (2014) it is possible to calculate the radii of zones having a different density of radial cracks around the blasthole.This theory explains the fracturing mechanism of rock under explosive load. Here the main part of that theory is presented since it is the basis of this paper.

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  • Estimating extent and properties of blast-damaged zone

    2. Rock blasting theory. According to a new rock blasting theory Torbica and Lapcevic (2014) it is possible to calculate the radii of zones having a different density of radial cracks around the blasthole.This theory explains the fracturing mechanism of rock under explosive load. Here the main part of that theory is presented since it is the basis of this paper.

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  • BLASTING REPORT APPENDIX JJGold Coast Quarry

     · The effects of blasting can be considered in two lightsthe effect on the surrounding rock mass and the effect on nearby people and structures such as houses. The former represents the zone within which the impacts are sufficiently high to cause damage to the rock mass and fracturing of the rock

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  • Damage Evolution Mechanisms of Rock Induced by Blasting

    Blasting has been widely used in coal mining as a method of reducing the integrity of rock mass. Its low controllability often leads to the unsatisfactory fragmentation effect of rock mass. The empty borehole effect has great significance in avoiding the excessive breakage of rock mass and guiding the directional propagation of blasting-induced fractures. Nevertheless the rock mass damage

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  • ROCK FRACTURING MECHANISMS BY BLASTING

    Rock fracturing mechanisms 21 2 4 8 16 32 𝑟𝑐 ( ) 3.00 1.50 0.75 0.38 0.19 Figure 3 Illustration of tension crack length and density around the blasthole 2.2 Tension cracks subparallel to the free surface As it was already mentioned the strain in direction of the pressure wave propagation (compression) is numerically equal to the strain in the plane of the wave front (tension).

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  • Rock Blasting and Explosives Engineering Taylor

     · Rock Blasting and Explosives Engineering covers the practical engineering aspects of many different kinds of rock blasting. It includes a thorough analysis of the cost of the entire process of tunneling by drilling and blasting in comparison with full-face boring.

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  • Blast Induced Damage to Surrounding Rock Mass in an

     · Rock mass damage can ascribed to different processes such as inherent damage arising from tectonics or presence of discontinuities fractures and faults of various dimensions mining induced i.e. from stress redistribution due to excavation and blasting 6 . Any damage inflicted upon the rock by blasting is designated as BID. The process of rock

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  • A Case Study Examination of Two Blast Rounds at a

     · assessing blast-induced damage in underground mines and discussed the feasibility of improving ground control results through the use of controlled blasting. Iverson et al (2007) outlined an approach for assessing perimeter blast damage based on rock

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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 with the different distances through the corresponding devices. The vibration results illustrate that at the same monitoring distance and

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  • Blasting cumulative damage effects of underground

     · The principle of sonic wave measurement was introduced and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation

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  • Blast Induced Damage to Surrounding Rock Mass in an

     · Rock mass damage can ascribed to different processes such as inherent damage arising from tectonics or presence of discontinuities fractures and faults of various dimensions mining induced i.e. from stress redistribution due to excavation and blasting 6 . Any damage inflicted upon the rock by blasting is designated as BID. The process of rock

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  • Blast Induced Damage to Surrounding Rock Mass in an

     · Rock mass damage can ascribed to different processes such as inherent damage arising from tectonics or presence of discontinuities fractures and faults of various dimensions mining induced i.e. from stress redistribution due to excavation and blasting 6 . Any damage inflicted upon the rock by blasting is designated as BID. The process of rock

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  • Estimating extent and properties of blast-damaged zone

    2. Rock blasting theory. According to a new rock blasting theory Torbica and Lapcevic (2014) it is possible to calculate the radii of zones having a different density of radial cracks around the blasthole.This theory explains the fracturing mechanism of rock under explosive load. Here the main part of that theory is presented since it is the basis of this paper.

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  • Vibration and Distance

     · Blasting vibration-distance relationships are usually depicted differently in scientific contexts than other kinds of construction vibration. The diagram below depicting actual blasting vibration data from a construction project involving leveling and terracing of a planned housing development area on a volcanic rock site shows how blasting vibration velocities are typically plotted vs. a

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  • PROCEDURES FOR BLASTING

     · Blasting primarily trench and ditch blasting can displace rock and damage adjacent pavement and underground utilities. 4. Noxious Fumes Blasting generates carbon monoxide and other noxious fumes. The fumes generated during blasting operations especially during trenching operations can migrate and collect

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  • DAMAGE ZONE PREDICTION FOR ROCK BLASTING

     · To reduce unwanted damage the ability to predict damage caused by rock blasting is essential. A shock wave based engineer-friendly technique is developed in this dissertation. The design procedure is based on charts graphs and a computer program. The dissertation deals with three major aspects of developing a damage

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  • 16 Blasting damage in rockEROSION

    292 Chapter 16 Blasting damage in rock Guinea trials were carried out on dozer cutting of the final pit wall faces. The final vertical blastholes were placed about 19 m from the ultimate bench crest position. The remaining rock was then ripped using a D-10 dozer and the final 55

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  • A New Perimeter Control Blast Design Concept for

     · The damage results in overbreak or rock that was not designed to be removed loose rock to be scaled and permanent damage to the remaining perimeter. Both the lack of a controlled blast design and of precision drilling are the main causes of perimeter damage. Perimeter damage was assessed in 2006 and 2007 by researchers from the National

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  • Blasting cumulative damage effects of underground

     · The principle of sonic wave measurement was introduced and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation

    Chat Online
  • Estimating extent and properties of blast-damaged zone

    2. Rock blasting theory. According to a new rock blasting theory Torbica and Lapcevic (2014) it is possible to calculate the radii of zones having a different density of radial cracks around the blasthole.This theory explains the fracturing mechanism of rock under explosive load. Here the main part of that theory is presented since it is the basis of this paper.

    Chat Online
  • Study on the Vibration Effect of Short Footage Blasting

     · blasting butrequiresmultipleblasting isinevitablethat the cumulative effect of blasting load on the surrounding rock and initial support structure within a certain range from the blasting face will be produced. is cumulative effect is especially obvious in short footage blasting exca-vation. However there is little systematic research on the

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  • REDUCING COAL DAMAGE AND LOSS WITH A NEW

     · REDUCING COAL DAMAGE AND LOSS WITH A NEW BLASTING TECHNOLOGY Tapan Goswami 1 Geoff Brent 2 and Lloyd Hain 3 1Tapan Goswami Principal Mining Consultant Orica Mining Services PO Box 196 Kurri Kurri NSW 2327 Australia. 2Geoff Brent Research Associate Orica Mining Services PO Box 196 Kurri Kurri NSW 2327 Australia. 3Lloyd Hain Drill Blast Engineer Ensham

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  • Rock Blasting and Explosives Engineering Taylor

     · Rock Blasting and Explosives Engineering covers the practical engineering aspects of many different kinds of rock blasting. It includes a thorough analysis of the cost of the entire process of tunneling by drilling and blasting in comparison with full-face boring.

    Chat Online
  • Blasting cumulative damage effects of underground

    The principle of sonic wave measurement was introduced and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation

    Chat Online
  • Modelling blast induced damage from a fully coupled

    Location 8600 Rockville Pike Bethesda MD Chat Online
  • Vibrations Can Cause Structural DamageCED Technologies

    Common construction activities such as large equipment traffic drilling blasting and soil compaction produce ground vibrations which conceivably damage nearby buildings or homes. Demolition and new foundation work are common sources of vibrations that can cause an area effect.

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  • Rock Blasting and Explosives Engineering Taylor

     · Rock Blasting and Explosives Engineering covers the practical engineering aspects of many different kinds of rock blasting. It includes a thorough analysis of the cost of the entire process of tunneling by drilling and blasting in comparison with full-face boring.

    Chat Online
  • Modelling blast induced damage from a fully coupled

    Location 8600 Rockville Pike Bethesda MD Chat Online
  • Blast Induced Damage Due to Repeated Vibrations in Jointed

    Blast Induced Damage Due to Repeated Vibrations in Jointed Gneiss Rock Formation 10.4018/jgee. Blasting is the most common method of rock excavation technique in mining and civil construction and infrastructure projects. Rock blasting produces seismic

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  • Rock fragmentation by blasting—a literature study of

     · (1999). Rock fragmentation by blasting—a literature study of research in the 1980′s and 1990′s. Fragblast Vol. 3 No. 3 pp. .

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  • A New Perimeter Control Blast Design Concept for

     · The damage results in overbreak or rock that was not designed to be removed loose rock to be scaled and permanent damage to the remaining perimeter. Both the lack of a controlled blast design and of precision drilling are the main causes of perimeter damage. Perimeter damage was assessed in 2006 and 2007 by researchers from the National

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  • Rock Engineering Practice Design

     · D i bl ti th During blasting the expli dlosive damage may t l di not only occur according to the blasting round design but there may also be extra rock damage behind the excavation boundary. To minimize damage to the rock a prerock a pre-split blast (surface excavation) or smooth-wall blast

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  • Appendix 16 Review of the Impact of Blasting on Rock

     · A fundamental discussion is provided on the flow of water through structured rock and the potential blast damage mechanisms that could lead to an increase in permeability. Theoretical approaches to estimate the extent of damage in a rock mass for a given blast design are discussed.

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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 with the different distances through the corresponding devices. The vibration results illustrate that at the same monitoring distance and

    Chat Online
  • Modelling blast induced damage from a fully coupled

    Location 8600 Rockville Pike Bethesda MD Chat Online
  • Modelling blast induced damage from a fully coupled

    Location 8600 Rockville Pike Bethesda MD Chat Online

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