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.
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In seven coal mines, Singh [8] studied the influence of large-scale blasting in open-pit coal mines on the stability of underground working faces in adjacent coal mines, and proposed the vibration ...
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This web page provides an overview of blasting for construction projects, with a focus on the differences between cartridged and bulk explosives. It also discusses the factors affecting blasting vibration, the criteria and human response, and the role of blasting …
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miner) is the most commonly used method for underground coal mine development. While mechanical tunnelling through fair to hard-rock conditions is common practice in civil engineering, there are
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Mining development is an indispensable part of China's economic construction, which has made great contributions to the economy. Tunneling blasting is the main construction method in the mine construction and production process. The success of excavation will directly affect the blasting effect of roadway excavation.
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Underground Construction. Bai Yun, in Underground Engineering, 2019. 4.2 Conventional Tunneling. The conventional tunneling method is a cyclical process of tunnel construction that involves excavation by drilling and blasting or by mechanical excavators (except the full-face tunnel boring machine (TBM)). This is followed by …
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As a result of its characteristics such as deep buried depth, high ground pressure and enormous over-break, when drilling and blasting tunnels, fine management and control of blasting can be...
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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 …
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Tunneling blasting is the main construction method in the mine construction and production process. The success of excavation will directly affect the blasting effect …
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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 …
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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 …
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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.
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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 ...
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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 …
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Conditions For Deep-Hole Blasting In Opencast Coal Mine (See Regulation 194 of the Coal Mines Regulations 2017) GENERAL . 1.0 The owner and agent of an opencast mine shall ensure that a prior scientific study is conducted in designing deep hole drilling and blasting system for the mine taking into consideration all mining …
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The process of underground drilling and blasting is one of the most visually stimulating aspects of mining. It's also one of the most dangerous. The Australian Centre for Geomechanics (ACG) has developed a training and safety guide for miners to properly …
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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 ...
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The coal roadway heading using a blasting method is very common in China. However, the coal dust produced by blasting is the most serious problem in a roadway of coal mine. The gas–solid two-phase flow regularity for blasting heading face is the key scientific issue for dust control.
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This paper investigates the characteristics of mine tremors and stress distribution before and after deep-hole blasting during the mining process in Dongtan …
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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 …
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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 ...
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[30][31][32] The feasibility of this technology in thick coal seams was examined by the experiment in the Ningtiaota Coal Mine, Baoshan Coal Mine, and Hongqinghe Coal Mine. 23,24, 30 In recent ...
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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 ...
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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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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 …
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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 …
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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 …
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As one of the major issues in coal mine, dust not only damages the mechanical equipment used in coal mining process, but also reduces the visible range of the coal mine workers and causes a serious occupational disease – pneumoconiosis (Wang et al., 2015; Wang et al., 2019c).
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Electrowinning - A process used to recover metals in aqueous solution by applying a current and causing the metal to deposit onto an electrode.; Electrolysis - A technique that uses a direct electric current to drive an otherwise non-spontaneous chemical reaction.; Electrolytic refining - A process of using electrolysis to increase the …
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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 …
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However, the coal dust produced by blasting is the most serious problem in a roadway of coal mine. The gas–solid two-phase flow regularity for blasting heading face is the key scientific issue ...
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This paper describes the steps and testing that should be adopted for geotechnical purposes during exploration for a new coal mine or an extension to an existing one. It …
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NPTEL provides E-learning through online Web and Video courses various streams.
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Then, in 1998, Singh simply described a rock breaking project with this blasting technology at quarrying in Turkey. At the end of the 20th century, LCPTB was introduced to the coal mining industry ...
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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...
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In this paper, a hypothetical open pit copper mine is considered, which needs to produce 30 million tonnes of waste and 25 million tonnes of ore based on its annual …
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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 ...
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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 understanding results in poor coal seam gas extraction. In this study, a stress–damage coupling model was established to investigate …
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The optimization of blasting operations greatly benefits from the prediction of rock fragmentation. The main factors that affect fragmentation are rock mass characteristics, blast geometry, and explosive properties. This paper is a step towards the implementation of machine learning and deep learning algorithms for predicting the …
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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 …
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