The expected outcomes from underground blasting would be different under varying geomining conditions. ... (2012) Numerical modelling of the effects of weak immediate roof lithology on coal mine roadway stability. Int J Coal Geol 90–91:100–109. ... (2020) Numerical simulation of rock mass blasting using particle flow code and particle ...
1. Introduction. Rock burst, a typical dynamic disaster induced by elastic strain energy emitted in a sudden, rapid and violent way from coal and rock masses in both coal and rock mines, is posing a serious threat to the production and miners' safety (Cook Citation 1965, Brãuner Citation 1994, Mark and Gauna Citation 2016).Particularly, rock …
Directional long borehole has been promoted in underground coal mines. However, the hydraulic fracturing technology based on directional long borehole in underground coal mines is still in the initial stage. The uneven fracture distribution and small number of fractures in the conventional hydraulic fracturing with constant injecting …
Moreover, vibrations caused by blast mining in shallow coal seams near slopes has a significant deleterious effect on slope stability (Cui et al. 2022). Unfortunately, few studies have considered the effect of vibratory loads caused by blast mining in shallow coal seams on adjacent slopes, and the results have not been thorough or systematic.
Methane gas is released during the coal mining process. And in underground coal mines, like the coal mines in Emalahleni, there is an increased risk as the coal dust can explode as a direct result ...
A three-dimensional model is developed for a typical mine development region where the active mining takes place, as shown in Fig. 1.Details on the geometrical parameters are: W tunnel = 4.0 m; L tunne l = 12 m; H tunnel = 2.9 m; blowing fan diameter 0.3 m; exhaust fan diameter 0.6 m; brattice space in main shaft (W b 1) = 2 m; and …
Gas disaster is one of the main mine disasters affecting the safe of coal mines 1,2,3,4.The most common method to prevent gas disaster is gas drainage 5,6,7.Permeability enhancement is currently ...
The U.S. coal industry serves a vital role in the nation's economy by producing fuel for more than half of its electricity. Despite the industry's importance, industry financial data for 2005—the strongest year for the …
Abstract. Induced caving by blasting during depillaring of panels in underground coal mines has received limited attention. This technique has become an integral part of a mining operation known as the blasting gallery (BG) method in India.
The objective of this study is to recommend solutions to the blasting difficulties that are encountered in gaseous underground coal mines in which there are …
The blasting method is adopted in the construction of the roadway. After blasting every time, the roadway will drive forward about 1.5 m.The dust produced in this area will jet away from the heading face at a speed of about 6 m/s when blasting happens, and release into the roadway, then are delivered under the pressing air from the outlet of …
With the increasing depth of coal mining, the ground stress of coal seams rises, the gas content rises, and the permeability decreases, which is unfavorable to gas extraction and increases the possibility of gas accidents in coal mines. Blasting technology is often used to improve the permeability of coal seams and increase the effect of gas …
In a development gallery, coal can be blasted without giving an undercut, by the use of explosives of P5 type. The blasting is known as blasting-off-the-solid or, in short solid blasting. P5 explosive is used along with Carrick short delay detonators (of I.E.L) or coal delay detonators (of l.D.L.) …
Explosives and ignition systems used in underground coal mines are determined by laws, statutes, regulations and strict rules. ... conditions for rock during the blasting process of straight cuts ...
BHP Mitsubishi Alliance (BMA) has announced the completion of the electronic blast at the Caval Ridge coal mine in Australia. The coal project is located at Bowen Basin, Central Queensland. Explosives supplier Dyno Nobel's DigiShot technology was used for the blast.
This study considered the role of coal as China's basic energy source and examines the development of the coal industry. We focused on the intelligent development of coal mines, and introduced the "Chinese mode" of intelligent mining in underground coal mines, which uses complete sets of technical equipment to propose classification …
Page 1 of 2 Controlled Blasting in Mines & Quarries- A Paradigm Pijush Pal Roy* Dr. BC Roy Engineering College, Durgapur, India *Corresponding author: Pijush Pal Roy, Director, Dr. B. C. Roy ...
Coal mining - Underground, Surface, & Drilling: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in …
enables faster piston movement. In 2005 's 3038 high frequency drills were trialled at Malmberget mine in Sweden. They achieved penetration rates of 5.3 m/minute in granite as opposed to
The gob-side entry-retaining by roof cutting and pressure relief (GERRC) method is an advanced no-pillar mining method that can significantly improve coal recovery and reduce roadway accidents.
This appendix presents additional details on the individual processes that are involved in extraction of coal from surface and underground mines, and the subsequent …
In Mexico, for 2016, the mining sector contributed 4% of the national Gross Domestic Product and Mexico was the biggest silver producer globally, with 25% (SE, 2018). In …
The Karadon mine, where field studies were carried out, is located in the north west of Turkey and is considered to be a highly gaseous coal mine. Explosives and ignition systems used in underground coal mines are determined by laws, statutes, regulations and strict rules. Restrictions arising from legal requirements, such as …
This project has shown that directional drilling can be a viable technology for use in the coal overburden removal process ... [Show full abstract] resulting in …
Mining coal. Coal miners use large machines to remove coal from the earth. Many U.S. coal deposits, called coal beds or seams, are near the earth's surface, but others are deep underground.Modern mining methods allow U.S. coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in …
1 Introduction. Coal is presently an essential energy source throughout the world, except for the middle east and the Former Union of Soviet Socialist Republics (USSR), which have virtually two-thirds or more of the global oil and natural gas reserves (Grimston, 1999) and will remain for many ages (EIA and International, 2003; Miller, …
Introduction. In China, coal mines generally have the characteristics of low pressure, low permeability, low saturation, and strong heterogeneity, which lead to difficulties in gas extraction, resulting in gas explosions and coal and gas outburst disasters. 1−3 Improving the coal seam permeability and gas predrainage effect has become a …
To improve gas extraction efficiency in high gas and low permeability coal seams while ensuring blasting security, deep hole cumulative blasting parameters …
Drilling and blasting are the most common methods for tunneling and underground excavation. The process begins with holes of predetermined diameter, depth, and …
Most coal mine field application processes are carried out using empirical formulas because of the insufficient understanding of the fracture development law of the static blasting technology.
