Definition of Longwall Mining • A high extraction method of mining along the face of a predefined block of coal, referred to as a panel, while allowing the immediate roof to collapse upon advancement • Panel Configuration – Panels generally range in size from 500 to 1,000 feet in width and lengths exceeding two miles
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Instrumentation and monitoring is undertaken aiming at evaluation of changing values of rock mechanic parameters, namely, dilation, load, convergence, and stress, during mining for a safe strata control. It enables the mining practitioners to anticipate roof fall–related dangers in advance and taking subsequent preventive …
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To increase the efficiency of surface drilling, the 'one well for triple use' extraction model has been developed. This mining model includes three steps: pre-draining gas before mining, extracting gas during mining, and post-goaf gas drainage. This integrated reservoir reconstruction technology is becoming increasingly popular [27]. …
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Borehole hydraulic fracturing in coal seams can prevent dynamic coal mine disasters and promote the sustainability of the mining industry, and microseismic signal recognition is a prerequisite and foundation for microseismic monitoring technology that evaluates the effectiveness of hydraulic fracturing. This study constructed ultra …
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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 broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in …
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Criterion #IV: Based on the standard "Basic index of coal mine gas drainage and exploitation" (GB41022-2021, 2021), when the absolute gas emission is within a range of 10–20 m 3 /min, the gas extraction ratio should be greater than 30%. The absolute gas emission from the mining face of the Yuxi Coal Mine 1304 was 19.27 m 3 …
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After underground mining starts, a large number of cracks will be generated in the fracture zone of the goaf, which is an important channel for gas flow migration 1,2,3.If the gas extraction ...
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The No. 8 coal seam in the Huaibei coal mine area is a soft, thick coal seam with low permeability. This area has a high frequency of coal and gas outbursts. Considering the geological conditions of the coal seam group, long-distance lower protective seam mining combined with stress-relief gas extraction has been used to …
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Our open database on global coal and metal mine production 12 covers worldwide mining activities of metal ores and coal, on an individual mine level. It comprises 1171 mines, production data for ...
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In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction. The elements of a surface mining operation are (1) topsoil removal and storage for later use, (2) drilling and blasting the strata overlying the coal seam, (3) loading and transporting this fragmented overburden material (called …
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Widespread ground fissures caused by coal mining subsidence are a main cause of ecological destruction in coal mining areas, and the rapid monitoring of ground fissures is essential for ecological restoration. Traditional fissure monitoring technologies are time consuming and laborious. Therefore, we developed a method to automatically …
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1. Introduction. As the depth of coal mining increases, the gas pressure and content in coals have increased. Gas accidents such as coal and gas outbursts and gas explosions have occurred frequently, which threaten coal mine safety production [1, 2].Gas extraction can reduce coal seam gas pressure and gas content, eliminate outburst …
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Viney et al. (2021) presented a methodological framework for modelling the impacts of future coal mining and coal seam gas extraction on surface water resources …
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Coal mining is the process of extracting a coal reserve from the ground. As a commodity, coal is valued for its energy content and since the nineteenth century has been widely used to generate electricity and as a fuel source for the steel and cement industries. ... Mine designs based on a resource model. ... Mine depth. Today, coal …
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Research highlights Investigate the deformation of overlying coal seams using physical scaled model. Study the deformation behaviors the double-seam extraction has using numerical simulation. The laboratorial findings are instructive to the configuration of surface boreholes and drainage management. The field degasification practice is …
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Taking into account the gas deposition and flow conditions in the Chinese coal basins, this paper describes the status of the theory and key technologies of this …
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From Fig. 3, the mathematical model is observed to be quite for the evaluation of the gas extraction with slotted borehole.The gas-drained influence radius is closely related to properties of coal seam, such as the permeability, the CH 4 pressure, the temperature and the coal adsorption characteristics. In addition, the engineering tests …
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This method, exemplified by the 1075 intelligent working face at the Yangliu coal mine, integrates temporal and spatial considerations for comprehensive extraction. …
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Jincheng mode further highlights the overall planning of coal mining and integrates the surface and underground gas extraction with coal mining in time and …
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This manuscript presents examples of the modelling of the impacts of coal mining and coal seam gas extraction on streamflow in five study catchments in Australia.
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The pertinence and effectiveness of gas extraction for underground coal mining is an important issue for simultaneous exploitation of coal and gas. The key issue is the definition and analysis of mining-enhanced permeability of mining-induced fracture network. In order to describe the permeability evolution process during coal mining, the …
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Coal obtained in different places is not the same and varies widely depending on the nature of the soil and geographic conditions. There are two major types of coal mining: underground mining and surface mining. Coal mining satiates roughly 1/4 of our global energy demands, and it is coal that has powered America's power needs for …
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1 THE CURRENT SITUATION OF COAL AND COALBED METHANE DEVELOPMENT IN CHINA. According to recent statistics, 1 the reserves of coal resources in China are approximately 249.23 billion tons, and the reserves of coalbed methane (CBM) resources, with a depth of 2000 m, are approximately 31.46 Tm 3.The latter is …
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This study aimed to examine gas extraction technology in the goaf of an L-shaped borehole in the mining fissure zone of a short-distance coal seam group. The numerical …
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Before a coal mining operation, it is necessary to carry out coal-bed methane (CBM) pre-extraction to prevent coal and gas explosions, causing accidents. However, gas extraction and coal mining will lead to coal damage, which results in a change in the gas migration law. Especially, under deep mining conditions, the gas …
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Stress-damage-flow coupling model for methane extraction. Coal seam methane extraction is a complex process, including multiphysical field effects such as methane seepage and adsorption, coal deformation damage, and temperature exchange. ... Influence of hydraulic flushing cavity on methane extraction. The coal seam of …
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To study the fracture evolution of overlying strata for ascending mining in a short-distance coal seam group, a two-dimensional physical simulation model was designed based on a specific geological condition. The fracture development zone was divided into the compaction zone and active zone by monitoring and analyzing the …
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Abstract. Gas drainage is the main technical measure to prevent and control coal and gas disasters. Reasonable extraction parameters can improve extraction efficiency and reduce the risk of gas accidents.
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Coal mining in regions characterized by high groundwater table markedly predisposes to surface subsidence and water accumulation, thereby engendering substantial harm to surface vegetation, soil, and hydrological resources. Developing effective methods to extract surface disturbance information aids in quantitatively …
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Leverage Advanced Coal Processing Technologies. As the coal mining industry faces increasing pressure to adopt sustainable practices, EcoCoal Solutions is poised to lead the charge by leveraging advanced coal processing technologies. By embracing innovative approaches to coal extraction and processing, the company can not only improve …
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simultaneous extraction of coal and CBM is the best measure for the utilization of coal mine CBM resources and the control of CBM disasters.10−12 The seepage law of CBM in coalbeds is one of the basic problems in the research fieldof coal mine CBM disaster prevention and control, which has important guiding
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Fully coupled compositional (coal seam gas and air) model of coal deformation, coal gas flow and transport, and air flow in coal seams is developed to better understand the gas drainage processes and the coal gas–air mixing mechanisms during pre-mining coal seem gas extraction. The model was first verified by showing that the …
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As intelligent mining operations evolve, stringent standards for gas management and extraction are imperative. To mitigate the risks associated with coal and gas outburst and to prevent gas concentration from exceeding safe limits, a comprehensive three-dimensional gas extraction system is introduced.
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While the world pivots towards green energy, coal still holds a critical position in the energy landscape, yet the environmental impacts of its extraction, particularly in small-scale operations, remain insufficiently explored. This study presents the first results regarding environmental impacts stemming from small-scale coal mines with equivalent …
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This research findings could offer novel insights into enhancing CBM extraction, indicating potential for safer and more efficient coal mine production. …
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The coal mining industry remains a critical component of the global energy supply, despite the rise of renewable energy sources. According to recent reports, the United States alone consumes over 600 million tons of coal annually, underscoring the enduring demand from power plants and industrial sectors.
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4.1. Engineering Background and Establishment of Physical Model. The simulated mine is located in the eastern part of the Pingdingshan mining area. The designed production capacity of the mine is 3 million tons per year, and the mineable coal seams in the mine consist of three groups of 4 layers, that is, Ding, Wu, and Ji.
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Learn how coal is extracted from surface and underground mines, and how it is beneficiated in coal processing plants. Compare different mining methods and their …
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DOI: 10.1016/J.IJRMMS.2014.08.012 Corpus ID: 129721476; A fully coupled coal deformation and compositional flow model for the control of the pre-mining coal seam gas extraction
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A remote sensing model to extract a coal area was developed by analysis of the features of the coal reflectance spectrum. The spectrum data of coal and other object samples from the Huolinhe (HLH ...
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