ppt blasting techniques in tunnel

Powerpoint Presentation Tunnel Construction

Powerpoint Presentation Tunnel Construction

blasting, powerpoint template tunnel underground subway metro, powerpoint background download free ppt templates, 20 best sales powerpoint templates ppt presentation, powerpoint templates, ppt gotthard base tunnel powerpoint presentation free, free powerpoint templates and google slides themes, free powerpoint templates, 100 good and interesting powerpoint presentation topics, .

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Drilling patterns

Drilling patterns

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 ; Using the excavated space as a transport route ; .

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TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST DESIGN

TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST DESIGN

This multiple face technique was used in the H3 highway tunnels in Hawaii. A by (12 by 18ft) center drift was excavated first and supported at the final tunnel perimeter with bolts and shotcrete. Subsequent side slash and center cut sections were then excavated and supported in the sequence shown below.

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Box Pushing Technology PDF | PPT

Box Pushing Technology PDF | PPT

 · Box Pushing Technology PDF | PPT. Topics For Seminar February 26, 2018. These project reports in pdf explain the box pushing techniques or methods used in Roadways and Railway projects. The intersection of railway track and the road at the same level is referred to as a level crossing. In the urban areas the level crossing is generally ...

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(PPT) MINIMIZATION OF BOULDERS DURING BLASTING AT .

(PPT) MINIMIZATION OF BOULDERS DURING BLASTING AT .

PROJECT TITLE: MINIMIZATION OF BOULDERS DURING BLASTING AT OPEN PIT QUARRY. PROJECT TYPE: PROBLEM SOLVING. CASE STUDY: NYANZA ROAD QUARRY. STUDENT NAME: MSABI NYANDA. : . f The NYANZA ROAD WORKS LIMITED is the company that deals with quarrying and construction activities. Its head office is found at Mwanza .

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Blasting In Mining Ppt

Blasting In Mining Ppt

Introduction drilling and blasting are the most widely adopted excavation techniques for mining and civil blasting results in ground shock and vibration which may cause damage to the surrounding structures such as buildings, bridges, dams. Read More. Rock Blasting Ppt Xpowerpoint. view and download powerpoint presentations on rock blasting powerpoint presentations .

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Geotechnical considerations in tunnel design and contract ...

Geotechnical considerations in tunnel design and contract ...

excavating equipment and techniques and for the highest possible rates of advance. Unfortunately, many of the contractual practices and the attitudes of owners, engineers and contractors which can still be found on many underground projects around the world are more appropriate to the more leisurely days of hand tunnelling. Operating a multiboom jumbo in a drill and blast tunnel or a high spe

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Ventilation System in Tunnel during Construction Works ...

Ventilation System in Tunnel during Construction Works ...

tunnel during construction to provide good environment for tunneling works. 1. Safe and health in tunnelling works In tunnelling works comprising drilling, blasting, excavation, shotcreting and mucking, appropriate measures are absolutely necessary to secure safe and healthy working environment. The ventilation system is the most effective method to settle the problem on the dust, smoke and ...

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[PDF] Special Tunnel Blasting Techniques for Railway ...

[PDF] Special Tunnel Blasting Techniques for Railway ...

Excavations of tunnels are common features in mining and civil engineering projects. In absence of initial free face, solid blasting method is employed for excavation of tunnels, drifts and mine roadways, which have many similarities in configurations and in different cycles of operation followed during excavation. A greater proportion of world's annual tunnel advance is still achieved by ...

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Drilling And Blasting PowerPoint PPT ...

Drilling And Blasting PowerPoint PPT ...

The global blasting automation services market size was accounted for over USD 400 million in 2019 and projected to witness a significant CAGR of over 12% during the forecast period 2020 to 2027. The technological advancement in automation drilling and blasting operations is a major factor to drive the market growth. Furthermore, the rising ...

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controlled blasting techniques – Mining and Blasting

controlled blasting techniques – Mining and Blasting

 · controlled blasting techniques December 21, 2010 by PARTHA DAS SHARMA. Modifiion of Blasting Techniques as per Geological Conditions of Strata . View this document on Scribd. Posted in blasting, explosives, mining | Tagged blasting, blasting techniques, controlled blasting techniques, mining | Leave a comment. September 2, 2009 by PARTHA DAS SHARMA. Techniques of Controlled Blasting.

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A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL ASPECTS OF ...

A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL ASPECTS OF ...

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. Perimeter blasting techniques are therefore more costly than redesigned production blasting because of the ...

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Blasting

Blasting

View Blasting from SEA at Saint Louis University, Baguio City Main Campus Bonifacio St., Baguio City. BLASTING TECHNIQUES (TE6) Chapter 1 Introduction to Blasting • Blasting is

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PROCEDURES FOR BLASTING

PROCEDURES FOR BLASTING

in blasting safety and blasting techniques, and are available to provide assistance during all phases of the blasting operations. Prior to blasting the Contractor shall submit a written blast plan to the Engineer for conditional approval. The Engineer will forward the blast plan to the Engineering Geology Section, Geotechnical Engineering Bureau for review and written comment. After approval ...

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Chapter 8 BLAST DESIGN

Chapter 8 BLAST DESIGN

Blasting analysis next becomes a function of the energy factor, explosives cost, fragmentation results, and subsequent production. Proper energy distribution is important in obtaining the desired fragmentation and movement of the bottom or toe portion of the shot. Energy distribution becomes an important factor when wet holes are encountered, as cartridged explosive products must be smaller ...

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Minimising the Environment Impacts of Tunnel Blasting

Minimising the Environment Impacts of Tunnel Blasting

Drilling and blasting techniques are often thought of as offering higher risk solutions, particularly in terms of meeting strict environmental limits. Drill and blast methods are preferred though since they deliver faster and less costly tunnel development when compared to most mechanical methods. The environmental limits are normally managed as follows: i. Ground Vibration – strict control ...

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Tunnel Construction Techniques And Methods Ppt PowerPoint ...

Tunnel Construction Techniques And Methods Ppt PowerPoint ...

Presenting this set of slides with name tunnel construction techniques and methods ppt PowerPoint presentation ideas layouts pdf. The topics discussed in these slide is tunnel construction techniques and methods. This is a completely editable PowerPoint presentation and is available for immediate download. Download now and impress your audience. Your ideas deserve the best accessories. Our ...

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Tunnel Support Design

Tunnel Support Design

Tunnel Support Design Summary Summary • Projectspecific ground characterization • Compatible excavation methodology –Hard rock tunnel: rock mass discontinuities, strength and abrasion –Softground tunnel: continuous face and periphery support/ GW control / monitoring • Contingency –Risk Mitigation measures: presupport / ground treatment/ temporary invert support

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Drilling Blasting Pattern | Nature

Drilling Blasting Pattern | Nature

Blasting Safety with Proper Techniques. 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 .

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Basic Blasting

Basic Blasting

 · peledakan tambang terbuka disajikan dalam : raker internal pt. buma (11 12 oktober 2004) oleh : dedy irawan divisi tambang umum pt. dahana (persero) samar in da kalimantan.

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DRILLING AND BLASTING

DRILLING AND BLASTING

blasting. Machine tunneling is comparatively new, having come into general since the 1950s; the drilling and blast­ ing method has been practiced for several centuries. This leads to speculation as to whether the machine will com­ pletely replace the older and more conventional method of tunnel excavation. The complete obsolescence of underground drilling and blasting techniques does ...

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Blasting Techniques Used in Underground and Opencast Mines ...

Blasting Techniques Used in Underground and Opencast Mines ...

Blasting gallery technique was adopted at GDK 10 incline of Singareni Collieries Co. Ltd. with collaboration of M/s Charbonnage de France. The method involves drivage of level galleries, and depillaring by drilling holes in a fan pattern around the gallery. The full thickness of the seam is extracted by retreating along the galleries, while blasting and loading out of successive slabs. Due to ...

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Underground Construction (Tunneling)

Underground Construction (Tunneling)

A tunnel is "an excavation beneath the surface of the ground, the longer axis of which makes an angle not greater than 20 degrees to the horizontal." A shaft is "(1) a passage made from the surface of the ground to a point underground, the longer axis of which makes an angle greater than 20 degrees to the horizontal; or (2) a pit in which ...

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5 Explosives and blasting

5 Explosives and blasting

Blasting gelatin This is the most powerful explosive containing 92% NG and 8% Nitrocellulose (NC) which contains % nitrogen. Chalk, zinc oxide, air bubbles, acetone etc. are added to make the composition suitable for blasting purposes. Semi gelatin These are also termed as low NG, or high AN explosives due to the fact ...

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