59 likes • 14,717 views. gopal karmakar. Its a presentation about the design aspect of open cast mine. The author believes it will surely help the mining engineering students at the beginning level. Read more. 1 of 17. Blast design in opencast mining - Download as a PDF or view online for free.

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Destress blasting in one of the tools to improve mines safety and it is one of the most valuable techniques to control the damaging effects of rockbursts. Evolution, mechanisms and application of destress blasting are discussed in a holistic manner so that challenges involved in the application of destress blasting can be appreciated.

This technique is especially effective in back-break control through providing a separating surface between the main blasting pattern and open pit final walls. In this study, a large open pit mine was the case study for the goal of designing pre-splitting through implementation of direct and cost effective experiments.

A common technique in hard rock tunneling, and underground excavation in general, is drilling and blasting. This method of excavation assumes that damage will be done to the surrounding rock mass ...

Safety Precautions While Blasting. Here are the key safety considerations BICs and blasting crews should consider while shooting the blast: A red flag will mark the blast area for everyone's safety. Evacuate all personnel 200 meters from the explosives detonation site. Blow a shrill whistle before lighting the fuse.

23 slides. Explosives and Blasting Agents Transportation. Covers relevant provisions of 29 CFR 1910.109. 21 slides. Safe Introduction of Electronic Detonators. From the Ensign-Bickford Company, this presentation cover safety precautions which apply to detonators. 15 slides. The History of Explosives.

The individual charges are 1-12 kg or 10-30 g/m 3 of the soil to be compacted. Place explosive materials in drilled or jetted boreholes at a depth of about 50-75% of the total soil depth intended to be compacted, below the water table. The distance between boreholes ranges from 5-15 m. For large projects, engineers can use test blasting to ...

Procedure of the blasting for ground improvement. Series of boreholes are drilled and Pipe of 7.5 to 10 cm is driven to the required depth. The detonator and the dynamic sticks are both enclosed in a water proof bundle and is lowered through casings. Casing is withdrawn and a wad of paper or wood is placed against the charge of …

Line Drilling Blasting Data. This blasting was carried out using a burden x spacing = 7 m x 8 m, with each hole charged the same as the normal blast location charged, which is 76 kg ANFO with an ...

This document discusses techniques for controlled blasting to improve environmental and safety standards. It describes methods like line drilling, trim blasting, pre-splitting, and muffle blasting that are used to control adverse impacts from blasting such as overbreak, ground vibrations, noise, and rock fractures.

The flyrock originated from a toe blast. The toe round consisted of 23 holes ranging in depth from 3 to 5 ft. The holes were loaded with 2-1/2-in diameter packaged explosive product. Explosive energy takes the path of least resistance and blasting of small diameter angled toe holes requires special attention.

K controlled blasting. 1. mtmy 1 CONTROLLED BLASTING In tunneling, road and railroad cuts, it is of the utmost importance that he remaining rock is of high quality in order to avoid rockfall, rockslides and excessive maintenance work. Line drilling Line drilling is the earliest controlled blasting method used. The purpose of line drilling is to ...

Blasting - A Technique for Soil Improvement. Blasting was used successfully in many projects for soil improvement. Buried, time-delayed explosive charges are used to densify granular soils. The sands and gravels must be essentially cohesionless with a maximum of 15 percent of their particles passing the No 200 sieve size and 3 percent passing 0 ...

Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: (1) Pyramid cut or cone cut (2) Wedge cut (3) Drage …

Effective burden on perimeter holes should not be greater than about 25 times the blast hole diameter, preferably about 20 times. Limit the width of the blasts to no more than 1.5 times the bench height. 43 The best spacing between back-row blast holes lie between 25 and 40 times the blast hole diameter.

Underwater blasting, often known as submarine blasting, is used for a wide range of pur-poses. This includes harbor and channel widening, trench excavation for establishing oil and gas pipelines and communication cables, demolition operations, and substructure construction. Particularly, underwater rock blasting is the most dificult and least ...

This document discusses techniques for controlled blasting to improve environmental and safety standards. It describes methods like line drilling, trim blasting, pre-splitting, and muffle blasting that are used to control adverse impacts from blasting such as overbreak, ground vibrations, noise, and rock fractures.

Air Blast Mine Safety. Airblast is the shock wave generated by an explosion. It is caused by the release of high pressure gases from the explosive and movement of rock and air. Airblast pressures as low as 0.03 psi can cause windows to vibrate but not damage structures, while pressures over 0.1 psi can crack windows and over 1.0 psi can cause ...

Various techniques of pre-split blasting were used in the initial stage of all major excavations. Hole diameters for pre-splitting were 89 mm, and hole spacing ranged from 0.8 to 1m. Explosive ...

This document discusses techniques for controlled blasting to improve environmental and safety standards. It describes methods like line drilling, trim blasting, pre-splitting, and muffle blasting that are used to control adverse impacts from blasting such as overbreak, ground vibrations, noise, and rock fractures.

The study was done to determine the quality of the final pit wall using the presplit blasting technique. As a part of the study, vibration and gas penetrating equipment were set up and a total of 3 blasts were monitored. The blasts monitored included a production blast, a wall control blast, and a pre-shear blast.

Types of Shot Blasting Techniques: There are several types of shot blasting techniques, each suited for different applications and materials: Wheel Blasting: Utilizes centrifugal force to propel abrasive media against the surface. Air Blasting: Uses compressed air to propel abrasive media through a nozzle onto the surface. Wet Blasting: Involves mixing …

Deep compaction techniques. Apr 15, 2020 • Download as PPTX, PDF •. 0 likes • 1,743 views. JNTUK. Loose granular sand deposits formed during the land reclamation process are vulnerable to liquefaction upon imparting seismic forces. These loose granular sand fills could encounter bearing failures or compress beyond tolerable …

This document discusses techniques for controlled blasting to improve environmental and safety standards. It describes methods like line drilling, trim blasting, pre-splitting, and muffle blasting that are used to control adverse impacts from blasting such as overbreak, ground vibrations, noise, and rock fractures.

CHAPTER 3: DRILLING AND BLASTING IN LARGE OPENCAST MINES 3.1 Drilling. 3.2 Blasting 3.3 Recent Advancement in Drilling and Blasting Techniques 9-22 23-29 30-40 CHAPTER 4: REVIEW OF OPTIMIZATION TECHNIQUES 4.1 General 4.2 Optimization of Mine Production System through Operation Research Techniques 41-45 45-48

A. Anurag Jha. The document discusses drilling and blasting techniques used in large open cast mines. It describes the different types of drilling systems including percussion, rotary, and rotary-percussion drilling. It also discusses the various explosives and blasting patterns used, including single and multi-row firing patterns.

Fragmentation control blasting – by definition, all blasts fragment the in situ rock mass. For fragmentation control blasting, the primary blasting objective is to achieve the target post-blast fragmentation distribution. MAusIMM, Director and Principal Consultant, Blasting Geomechanics Pty Ltd, Suite A, 20 Cinnabar Place, Carine WA 6020.

This document discusses techniques for controlled blasting to improve environmental and safety standards. It describes methods like line drilling, trim blasting, pre-splitting, and muffle blasting that are used to control adverse impacts from blasting such as overbreak, ground vibrations, noise, and rock fractures.

The study was conducted to develop controlled blasting patterns for safe blasting operations within the blasting zone of 50–100 m from the nearby dwellings. In order to minimize ground vibrations, three methods (1) Reduced burden and spacing with shorter hole depth, (2) Modified decoupled charged using plastic pipes and (3) Pre …