ppt blasting techniques in tunnel

CONTROLLED BLASTING TECHNIQUES
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Nov 24 2014 0183 32 controlled blasting techniques Broadly controlled blasting is done for controlling overbreak in opencast and tunnel and ground vibration It can be catagorised into four types pre-splitting trim blasting line drilling and smoothing blasting...

PowerPoint Presentation
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Workers generally use two basic techniques to advance a tunnel In the full-face method they excavate the entire diameter of the tunnel at the same time This is most suitable for tunnels passing through strong ground or for building smaller tunnels The second technique shown in the diagram below is the top-heading-and-bench method...

NPTEL Mining Engineering
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NPTEL provides E-learning through online Web and Video courses various streams...

Construction Planning Equipment CHAPTER BLASTING
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Blasting is performed to break rock so that it may be quarried for processing in an aggregate production operation or to excavate a right-of-way Blasting is accomplished by discharging an explosive that has either been placed in an unconfined manner such as mud capping boulders or is confined as in a borehole CHAPTER 13 BLASTING ROCK...

Photo Illustration to support the teaching of the topic on
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Tunnel Construction using Drill-and-Blast Method Basic work involvement and principle of the method 1 Site investigation to fully understand the geotechnical environment of the tunnel to be constructed 2 Forming the entrance to the tunnel by necessary site formation 3 Form a trial tunnel and fine-tone the tunnel alignment 4...

Introduction Tunnel Basics
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for building a tunnel is driving and advancing the passageway can be a long tedious process that requires blasting boring and digging by hand Tunnel Construction Soft Ground and Hard Rock Workers generally use two basic techniques to advance a tunnel In the full-face method they excavate the entire diameter of the tunnel at the same time...

Blasting damage in rock
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The correct design of a blast starts with the very first hole to be detonated In the case of a tunnel blast the first requirement is to create a void into which rock broken by the blast can expand This is generally achieved by a wedge or burn cut which is designed...

Tunnel Surveying
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Tunnel surveying is a type of underground surveying for the construction of tunnels Methods and procedure of tunnel surveying is discussed Special instructions on the type of survey and the equipment that must be used in the tunnel surveying procedure for...

Freezing techniques made a new tunnel possible
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tunnel close to neighbouring buildings and just above two existing metro tunnels The tunnel part was constructed by using the New Austrian Tunneling Method and freezing techniqu Züblin A/S was commissioned to plan design and construct the new tunnel Ny Metrotrappe 1 GENERAL DESCRIPTION Frederiksborggade is a busy street with small...

Drill and Blast Tunneling Practices
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Drill and Blast Tunneling Practices Gerhard Girmscheid1 and Cliff Schexnayder FASCE2 Abstract High-performance drill and blast methods for tunnel construction require that each of the individual working elements that constitute the construction process are optimized and considered as a system of sequential and parallel activiti...

Tunneling in Rock by Drilling and Blasting
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Controlled blasting for a new tunnel near an existing railway tunnel RN Gupta AK Raina Introducing specialized blasting techniques and sequences of excavation in tunneling works under critical conditions MM Singh NK Bhagat SK Mandal Controlling shock waves and vibrations during large and intensive blasting operations under...

Tunnel blasting techniques in difficult ground conditions
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The quality of tunnelling can be improved by proper blast design which takes into account the rock mass conditions The effects of different rock mass properties on tunnel blast performance need to be assessed The strength of the formation and joint orientation critically affected fragmentation and overbreak in a model study of blasting Similar effects were noted in situ when the performance...

Complete List of Different Methods of Tunnel Construction
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Nov 13 2017 0183 32 A Typical Horseshoe Section for a Two-lane Tunnel Rock Tunnels Rock tunnels are excavated through the rocks either by drilling or by blasting The tunneling method utilizes mechanized excavators in case of soft rocks or rock tunnel boring machines TBM Sequential Excavation Method SEM is also used in some cas...

Special Tunnel Blasting Techniques for Railway Projects
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Special Tunnel Blasting Techni ques for Railway Projects 481 q = q1 s tf swr def kg/m 3 1 where q1=specific charge for breaking of rock against a free face in kg/m 3 st = factor for structure and texture of rock f = rock confinement = 65 / A 1a...

GUIDE FOR TUNNELLING WORK
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the tunnel Many aspects of tunnel design influencing whether a tunnel is constructed safely like tunnelling in rock or soft ground are decided in the concept design stage During this phase duty holders should consult and plan to manage risks which may occur when constructing using and maintaining the tunnel...

Drill blast tunnel construction explained in 60 seconds
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Mar 19 2018 0183 32 Isometric explainer animation for drill and blast tunneling method...

Appendix 22 Tunnel Construction Methods
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Tunnel Construction Methodsdoc App22 - 1 1 Introduction This Appendix gives a general description of the tunnelling techniques reviewed for possible use in the Project including cut and cover drill and blast bored tunnelling and sequential mining construction A...

Blasting Techniques Used in Underground and Opencast Mines
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Blasting Techniques Adopted in Opencast Mines Efficient blasting should give such rock fragmentation as to eliminate the need for secondary blasting The fragmented rock should be easily handled by the bucket of the shovel For mineral which has to go to crushers the size should not be more than the input size for primary crusher...

Best practices Drilling and blasting Pit Quarry
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Dec 07 2015 0183 32 Larry Mirabelli senior manager at Buckley Powder Co teamed with Bill Hissem senior mining engineer at Construction to deliver a presentation on drilling and blasting at the 2015 Quarry Academy hosted by Dyno Nobel and Mirabelli who has more than 40 years of experience in explosives technology between Buckley Powder and Dyno Nobel discussed a concept...

controlled Blasting for civil construction in an urban
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Tunnel CLEM7 to the East-West Arterial Road which leads the support structure for this section of the tunnel and could not be damaged by blasting the pillar Blasting on this site was strictly controlled because it was as well as innovative timing techniques only made possible by using electronic initiating systems 1...

Modern Underground Blasting Methods E MJ
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Unlike with surface blasting the explosives companies and shot service providers also offer limited assistance or knowledge in the underground blasting realm leaving underground operations in the dark It is for these reasons that most underground operations are operating decades behind the current technologies and incurring significant...

I UNDERGROUND BLASTING
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The main difference between tunnel blasting and bench blasting is that tunnel blasting is done towards one free surface while bench blasting is done towards two or more free surface Various drilling patterns have been developed for blasting solid rock faces such as i wedge cut or V cut ii pyramid or diamond cut iii drag cut iv fan cut v...

Drilling patterns
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Blasting tunnels or drifts is a necessity in all underground mining operations Drill and blast techniques are the most conventional and common method and is most useful in high UCS and homogeneous rock types albeit slower than other methods These tunnels are created for many reasons including Using the excavated space for transport...

Rock blasting for mining
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Jul 28 2017 0183 32 78 51 Controlled Blasting Following are the different types of controlled blasting techniques Pre-Splitting - this is an old but highly recognized technique with the purpose to form a fracture plane beyond which the radial cracks from blasting cannot travel Other methods include 79...

Drilling and Blasting
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Jan 01 2012 0183 32 A disturbed zone surrounding a tunnel is related to two different techniques 1 mechanical boring or tunneling and 2 drilling and blasting method A disturbed zone by drilling and blasting is much larger than that by mechanical tunneling such as the tunnel boring machine TBM technique as summarized in the chapter Single-Hole Blasting in...

Chapter 8 BLAST DESIGN
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blasting conditions are both severe the operator should use premium explosives at least in the bottom one third of the drill hole Clearing the toe and therefore contributing to a smoother floor is a major asset to improve BLAST DESIGN...

Drilling and blasting powerpoint 2003
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Apr 21 2012 0183 32 drilling and blasting powerpoint 2003 1 seminar ondrilling blasting equipments 2008-09 by yogesh s ghule veermata jijabai technological institute civil...

Drilling Blasting Patternpptx Nature Free 30
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Blasting Safety with Proper Techniqu ENVIRONMENTAL ISSUES Blast holes can be drilled in either To overcome these hazards Ground Vibration Air Blast Fly Rock square pattern or staggered Premature Detonations and Misfires proper blasting pattern to be pattern IMPORTANT designed and followed as A staggered pattern produces a free faces given in the Table below clean the bench floor...

PDF Drilling and blasting as a tunnel excavation method
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In tunnel blasting operations the explosive or blasting agent may be charged into the hole by a pump truck An explos ive or blasting agent such as emulsion can be manufactured...

PDF Drilling and blasting as a tunnel excavation method
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The drill and blast method is not only economical in comparison to mechanical methods like tunnel boring machine road header etc but it can also be used to obtain varying tunnel profil...

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