drill and blast tunneling procedure ppt



Related Information:

SELECTION OF CONSTRUCTION METHODS IN ROCK TUNNELING

drill blast or mechanical excavation , means of rock support, face support and required auxiliary measur , For tunnels with shallow cover underneath built-up areas noise, vibrations and settlements could be affected by each construction method in a different way...

Read More

GUIDE FOR TUNNELLING WORK

43 Tunnel boring machines 27 44 Drill and blast 33 45 Portal protection 34 46 Inspections and scaling 35 47 Ground support 36 48 Sprayed concrete 37 49 Shafts 38 410 Shaft sinking 39 411 Raise boring 40 412 Raised shafts 40 413 Caissons 41 414 Ground freezing 42 415 Pipe jacking 43 416 Compressed air tunnelling 44...

Read More

Tunnelling and Underground Construction Technology

Excavation Methods Drill and Blast 20150320 19 Tunnelling and Underground Construction Technology Scaling Excavation Methods Drill and Blast 20150320 20 , Machine is suited for drilling tunnels through ground with limited or no self-supporting capacity Mainly used for excavating in silts or clays with sand 20150320 55...

Read More

Designing Blast Patterns Using Empirical Formulas

the interdependence of the drilling, blasting, and materials-handling operations While the author was conducting his study 14 , he noted many quarry operators were not cognizant of the work mentioned above There was a lack of awareness ,...

Read More

Underground Construction Tunneling

procedure, and emergency procedur This booklet summarizes all requirements of the standard The standard provides some flexibility in methods to control workplace hazards in underground construction as long as appro-priate precautions are taken to protect workers in a variety of situa-tions...

Read More

Stemming Plugs for Explosive Blasting drill blast holes

To plug or tamp a blast hole, for example Stemming prevents the loss of explosives energy from blowouts by plugging the end of the drill hole which produces better results from your blasts Geophysical, oil, exploration plugs Get the best results from your drilling and blasting procedures, it will show in your muck pile...

Read More

drill and blasting powerpoint

24-10-2021 0183 32 21 Jun 2013 , Under water blasting work at PPT wintint win , Blasting using explosives, Quarry work, Sequel Drill and blast - Duration 7 41 Sequel 110,630, Know More Rock fragmentation control in opencast blasting - ScienceDirect...

Read More

Drilling patterns

Drilling Patterns Various drilling patterns have been developed for approaching the blasting of drifts which are described in the following sub-sections These patterns refer to the pattern of the initial cuts which are then blasted into from surrounding hol This is known as stoping, and the additional holes are known as wall, roof or floor ,...

Read More

How to Conduct Blasting Operations Safely? PDF

Blasting is a process of reduction of rocks or hard soil into fragments with the help of explosiv The blasting operation involves drilling of holes, installation of a detonator and charge, detonating the charge, and removal of debris Fig 1 Blasting Operation in Hard Rock In this article, we discuss how to safely conduct blasting ,...

Read More

Chapter 8 BLAST DESIGN

of explosive energy be placed into proper perspective within the entire drilling, blasting, handling and process-ing operation This relationship is illustrated in Figure 8-7 Figure 8-7 Analysis of efficient blast design Efficient blast designs combined with the proper choice of explosive can produce better fragmentation with...

Read More

New Austrian Tunneling Method NATM

New Austrian Tunneling Method NATM The New Austrian Tunneling method NATM was developed between 1957 and 1965 in Austria It was given its name in Salzburg in 1962 to distinguish it from old Austrian tunnelling approach The main contributors to the development of NATM were Ladislaus von Rabcewicz, Leopold Müller and Franz Pacher...

Read More

Shaft sinking 1

26-05-2016 0183 32 Using this method, drilling and blasting can sink around 5-10 metres in one blast This is very labour-intensive, unsafe and has high running costs The most viable alternative for shafts up to 100m in length 15 Mucking The operation of loading broken rock by ,...

Read More

Underground Unit Cost Analysis

Tunnels ILC RDR U/G Costs Analysis Tunnel Construction Costs TBM 9,000 Construction Cost /m 8,0007,000 6,000 5,000 4,000 400 375 350 325 300 250 275 TBM Advance Rate m/week 3 4 56789 Nominal Tunnel Diameter m TBM Advance Rate Tunnel Construction Costs...

Read More

Technical considerations for TBM tunneling for mining projects

long, deep tunnels, where extensive lengths may be subject to overstressing due to low rock strengths and/or high in situ stress Destressing ahead of the advancing tunnel face does not occur for TBM excavation, but does for drill-and-blast tun - nels, and significant ,...

Read More

PDF Drilling and blasting as a tunnel excavation method

For most typical tunnel blasting, the powder factor varies between 06 and 5 kg/m3 The powder factor can vary from 1 kg/m3 in a tunnel with an opening size greater than 30 m2 to more than 3 ,...

Read More

Application of Tunnel Boring Machines in Underground Mine ,

tunneling projects is now carried out by mechanical excavation rather than drill and blast methods Drill and blast is also a well-developed technology, and the choice of excavation method becomes a matter of economics for both civil construction and mining Faster development schedules and lower costs can be achieved with mechanical excavators ,...

Read More

A CASE FOR URGENTLY ASSESSING IMPACT OF DRILLING AND ,

The Drill and blast method DBM is the conventional tunneling method in hard rock and is being used in the hydropower construction across Himachal In this method excavation is achieved by drilling a predetermined pattern of holes in the rock face, filling these holes with explosives, which are then discharged to crack and fracture the rock...

Read More

Drill and Blast Tunneling Practices

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...

Read More

905 029 2 Grouting

The drilling rigs are fitted with hydraulic drifters ie Euro-drill HDseries or similar , with different types of drill rods and drill tools to suit the geology and depth required for the individual project and with state-of-the-art equipment for drill parameter recording and borehole deviation mea-surement...

Read More

Blasting damage in rock

design of tunnel support, the movement of groundwater through jointed rock masses and the measurement of in situ stress Bringing up the rear are those areas of application where rock mechanics has to interact with other disciplines and one of these areas involves the influence of blasting upon the stability of rock excavations...

Read More

Drill and Blast Method

Drill and Blast Method Drill and blast method is mostly used method for the excavation throughout the world The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM This tunneling method involves the use of explosiv Compared with bored tunneling by Tunnel Boring Machine, blasting ,...

Read More