In mining and civil engineering construction projects, till this date, ... the process of blasting, to ascertain the basic features of generation, ... In underground coal mines, the possibility of ...
The Underground Mine. The underground mine is a factory located in the bedrock inside the earth in which miners work to recover minerals hidden in the rock mass. They drill, charge and blast to access and recover the ore, i.e., rock containing a mix of minerals of which at least one can be processed into a product that can be sold at a profit.
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 increased drill utilization and...
Central Institute of Mining and Fuel research (CIMFR) developed a technique of using plastic spacers between explosive cartridges in underground coal mines under a project funded by the...
construction site to permit frequent or large-scale blasting operations limits productivity and asset utilisation relative to the volume of rock. Further, the tendency to specify "ultra …
All mining operations requires blasting at one stage or another. Blast hole drilling is used in mining where a hole is drilled into the surface rock, packed with explosives and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, making deeper mining possible. The drilling of blast holes is …
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 coal industry in recent years—shows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between …
Torno et al. (2013) carried out a study in a coal heading, excavated by drilling and blasting in a deep underground mine located in Northern Spain (Hullera Vasco Leonesa SA), by measurements of blasting gases, CO and NO 2, in three cross-sections of the heading located at 20, 30, and 40 m from the heading face. Xu et al. (2013) described a ...
This is the first and most essential step of the mining process: in order to open a mine, companies must first find an economically sufficient amount of the deposit (an amount of ore or mineral that makes exploitation worthwhile.) ... Mountaintop Removal Mining for retrieving minerals from mountain peaks and involves blasting the overburden ...
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.
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 limitations arising from legal...
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 …
Request PDF | Innovative approach based on roof cutting by energy-gathering blasting for protecting roadways in coal mines | As underground mining progresses to deeper levels, roadway control has ...
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 …
Effective dust removal has long been a challenge in the blasting mining of underground metal mine tunnels, and uncontrolled dust diffusion seriously endangers workers' respiratory systems and the underground space safety environment. However, the vast majority of existing numerical studies on dust diffusion are focused on coal …
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 limitations arising from legal...
in an underground mine: 244482: 2: Transfer broken rock by means of a remote-controlled Load Haul Dumper in an underground mine: 244467: 2: Suppress dust in an underground mine using a water bowzer: 244373: 2: Drill holes underground by means of a handheld rock drill machine: 244415: 2: Doze material using a Track Dozer in an …
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 …
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Coal seam gas predrainage technology is considered to be one of the most effective measures to prevent coal mine gas disasters 1,2,3,4,5,6.However, with increasing mining depth, the gas pressure ...
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. Tunneling projects are indispensable for coal mining. Numerous roadways are constructed underground every year worldwide. Tunnel roadways function as connecting channels for transportation, pedestrians and ventilation (Wang et al., 2020).With the development of the longwall mining method, the multiroadway layout …
When the 1969 Coal Mine Health and Safety Act was enacted, U.S. coal production was about 600 million tons with about 60 percent underground mining and 40 percent surface mining. Longwall mining accounted for less than 1 percent of the underground production; room-and-pillar continuous mining accounted for about 50 …
After years of development, paste backfill technology has become an important part of China's green safety mine construction and coal green mining technology system in the new era. In this paper, the research status of paste backfill technology in China's coal mines is expounded from the aspects of paste backfill …
Coal resources play an important role in the world's energy development. China's coal consumption in 2022 was as high as 88.41 EJ. However, the process of energy extraction generates dust and gas, which is a serious threat to efficient production and workers' health.
This paper investigates the characteristics of mine tremors and stress distribution before and after deep-hole blasting during the mining process in Dongtan …
Two phase flow of air and dusts in underground metal mine tunnels are simulated. ... studied the effect of the length of the exhaust air duct on the dust diffusion in the coal mine excavation process based on Euler-Lagrange framework. ... Study on dust suppression performance of a new spray device during drilling and blasting construction in ...
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 ...
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 study was funded by the Open Research Grant of Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining (No. EC2023022), the Open Research Grant of State Key ...
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. This lack of …
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 …
Most open-cast mines have to manage large quantities of mine waters. Unlike in underground mines, controlling water inflow is possible only by backfilling, which will reduce the volume to be dewatered. Underground mining results in excavated rock from sinking shafts and opening up drifts and other types of tunnels being brought to the …
Blasting in Coal Mines •Modern mechanised coal mines use machines and longwall mining methods to cut solid coal and convey the broken coal out of underground …
Numerical Modelling of Blasting Dust Concentration and Particle Size Distribution during Tunnel Construction by Drilling and Blasting. Jianjun Shi W. Zhang ... To enhance the real-time monitoring and early-warning capabilities for dust disasters in underground coal mine, ... Gas–solid two-phase flow in an underground mine with …
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.
