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K = rock transmission factor Q = instantaneous charge mass (kg) D = distance (m) This formula was based on early research by Langefors and Kihlstrom into blasting in hard Swedish granite. The rock transmission factor allows for varying rock types and confinement conditions, eg. for hard granite K = 400. •Scaled Distance Formulae 1.


Subpart U applies to blasting and using explosives.Are your employees engaged in blasting or the use of explosives? If yes, then this subpart applies to you. The definitions applicable to the subpart provide key definitions such as:. Blasting agent - Any material or mixture consisting of a fuel and oxidizer used for blasting, but not classified an explosive and in which none of the ingredients ...

Construction Blasting Fundamentals | Expert Commentary ...

Compared with conventional blasting method such as rock drilling machines, the PBT technology is friendlier to the earth, because it causes less vibration, noise, and dust, and uses no chemical substances. In the blasting procedure, a reusable blasting electrode and a power supply main body incorporating capacitors and other devices that are ...

Blasting Crew Loading Explosives And Blowing Up Solid Rock ...

in Nevada, blasting in a drift caused a roof fall in another drift situated about 25 ft below the blasted drift. When the blast occurred in the upper drift, about 40 to 50 tons of material above the anchorage zone, supported by 6-ft roof bolts, fell as a result of the blast. Blasting often causes redistribution of stress in pillars and roof area.

Blasting Accessories In Mining Ppt Html

Sl.No Chapter Name English; 1: Lecture 01: Introduction to Drilling Technology: Download Verified; 2: Lecture 02: Introduction to Blasting Technology: Download

Blasting and Explosives Quick Reference Guide 2010

blast. Modification of blasting procedures should include limiting the size and frequency of blasts to limit the production of noxious fumes, and stripping of the overburden prior to blasting and excavating the shot rock immediately after blasting to allow the venting of gases. The use of vent holes or vent pits may also be necessary.

Purpose of this training

Different types of hazards are associated with excavation of soil. for instance, failure of soils at sides of trenches and pits, movement of buildings due excavations at its vicinity, falling workers into pits, buried workers due to collapse of earth, cave-in which may cause suffocations of labors and etc. These hazards should be identified and […]

(PDF) Construction Blasting Management And Risk assement ...

in Nevada, blasting in a drift caused a roof fall in another drift situated about 25 ft below the blasted drift. When the blast occurred in the upper drift, about 40 to 50 tons of material above the anchorage zone, supported by 6-ft roof bolts, fell as a result of the blast. Blasting often causes redistribution of stress in pillars and roof area.

Rock Fracturing by Plasma Blasting Technology

How to manage and improve construction Blasting, with On field experience

Purpose of this training

Videos, But All Are Hard Rock Blasting And Open Cut. Learners PPT. Presentation Summary : Videos, but all are hard rock blasting and open cut. Learners receive the class room presentations, a copy of the notes, a study guide and are given a

Blasting damage in rock

Underground Blasting Process - authorSTREAM Presentation. Underground Blasting Process - authorSTREAM Presentation ... (PPT, KEY, PDF) logging in or signing up. Underground Blasting Process ... know : When blast mining, there are a number of procedures that can be used to create the necessary access through the rock or other substance. Holes ...

NC DOL: Does "Subpart U

Dec 07, 2015· 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 …

Appendix E6

Flyrock – the fragments of rock thrown and scattered during blasting – is responsible for a large proportion of all blasting-related injuries and fatalities. Flyrock is a potential hazard anytime and anywhere there is blasting. Reduce flyrock hazards by adhering to …

Blasting Technique for Ground Improvement | CivilDigital

Aug 30, 2018· Stream the full videos at https://amzn.to/2KWBS0H Blasting Crew Loading Explosives And Blowing Up Solid Rock At A Quarry ----- This video shows a blasting crew loading the explosives into the ...

Drill and Blast Method

rock and burden distance. Each blast was monitored using high-speed video and seismographs. Dyno Consult provided additional seismograph and video monitoring, along with bore track and 3D laser profile data. Multiple photographs were taken of each of the zones for WipFrag analysis. Based on the fragmentation analysis the 25 ms and 10

Rock blasting for mining

Almost 10 hours after the blast, the rock was removed from the front-end loader and the victim was recovered. 10 slides: Defining the Danger Zone for Blasting Guidance for shotfirers and explosives supervisors on what to consider when determining the danger zone for quarry blasting.

Blasting Safety – Revisiting Site Security

in almost all rock, sand and soil. It is also found in concrete products and bricks. It is sometimes found in sandblasting (abrasive blasting) grit and is called "silica sand". 4 Silica Health Hazards Inhaled silica dust scars the lungs A lung disease called "silicosis" is caused by breathing of dust containing silica.

Blasting damage in rock

shape rock surfaces. Controlled blasting techniques, such as line drilling and smooth blasting, should be used. Soil Foundations When the foundation is soil, all organic or other unsuitable materials, such as stumps, brush, sod, and large roots, should be stripped and wasted. Stripping

Underground Blasting Process |authorSTREAM

Blasting damage in rock Introduction The development of rock mechanics as a practical engineering tool in both underground and surface mining has followed a rather erratic path. Only the most naively optimistic amongst us would claim that the end of the road has been reached and that the subject has matured into a fully developed applied science.

NPTEL :: Mining Engineering

PDHonline Rock Blasting Fundamentals Slide No. 3 Introduction zThe rock must fracture enough to displace it and break it down to the size of the intended use. zRock Blasting consists of drilling holes in a rock mass at depths, in diameters, and at spacing so that an explosive can fracture the rock in a controlled manner.

GG o f Journal of Geology & Geophysics Aloui et al., Geol ...

This module presents recommended blast-design practices for surface mine and quarry blasting. 1.3 : Blaster Training Module 4 This module presents aspects of surface drilling that are important to blasting operations. The purpose of drilling into rock is to …

Flyrock Dangers & Best Practices | Mine Safety and Health ...

Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth Blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)

Excavation Hazards

Nov 19, 2013· blasting 1. blasting most basic unit operation of any mining activity 2. objective • rock is blasted either to break in to smaller pieces such as in most mining and quarrying operations or large blocks for dimensional stone mining and some civil engineering application, or to create space.

Best practices: Drilling and blasting : Pit & Quarry

The blast design challenge is to effectively use this energy in the most efficient way to fragment rock in a controlled way. The great energy release of explosive can also cause less desirable effects, such as excessive ground vibration and concussion, overbreaking of the rock, and possible pre-compression failure of the adjacent explosive loads.