A water storage structure model for coal mine underground water reservoirs was established, taking into account the settlement boundaries of the bedrock …
Underground coal mining in South Africa accounts for 51%, long wall mining and room-and-pillar mining are main methods. Shelter as blind lane withcompressed air emerged in 1970s, while, study for
In this study, the hazards occurring in different sections of underground mining have been categorized, and associated risks have been predicted using different …
The major share of the world's production of coal pertains to underground mines which are mostly mined using three methods of longwall, short wall, and room and pillar. ... Ghasemi and Shahriar presented a new method for designing the coal pillars using the tributary area theory and abutment angle concept to improve the safety of room-and ...
Abstract. Underground coal mining leads to land subsidence, which, in turn, results in damage to buildings and infrastructure, disturbs the original ecological environment, and hinders the ...
With the large-scale mining of coal resources, the huge economic losses and environmental problems caused by underground coal fires have become increasingly prominent, and the research on the status quo and response strategies of underground coal fires is of great significance to accelerate the green prevention and control of coal …
This book is divided into nine key areas of underground mining. Beginning with a new look at conventional and continuous mining. The book covers advanced mining techniques, longwall mining, underground haulage, and control of roof, ventilation, dust, and methane. There are also extensive sections on coal transportation, maintenance, …
The following topics are addressed in twelve chapters: scope of ground engineering, fundamental principles of ground engineering, excavation …
A water storage structure model for coal mine underground water reservoirs was established, taking into account the settlement boundaries of the bedrock and loose layers in shallow coal seams, based on the key layer theory and the spatial structure model of the mining roof. The mathematical expression for the load on the coal …
Studying theory and practice of emergency refuge in mining-developed countries have reference and practical performance on domestic construction of emergency refuge system in underground coal mine. In Canada, research of underground emergency refuge system firstly began at Hollinger mine fire accident …
(a) Contour map of depth to underground water before coal mining, (b) Contour map of depth to underground water after coal mining (Yao et al., 2020a). Referencing to successful cases and considering the ecological characteristics of abandoned coalmines in China, Xie et al., 2015, Yuan et al., 2018, and Gu (2015) have …
China is the largest coal producer in the world and accounts for almost half the total coal production worldwide. Moreover, 90% of China's coal is obtained from underground mining (Hu et al. 2010; Wang et al. 1986; Wang et al. 2018).The hydrogeological configurations and conditions associated with underground mining are …
With the focus of traffic infrastructure construction gradually shifting to the central and western mountainous areas and karst areas, coal mine and underground engineering construction often face the baptism of complex structures, great changes in geological environment, and many disasters and accidents [].Water inrush is a serious …
This research utilized the variable weight theory (VWT) and improved the matter-element extension model (MEEM) to conduct an indicators sensitivity analysis of environmental engineering geological patterns (EEGPs) related to underground coal mining.First, four types of EEGPs, i.e., basically unaffected model, gradually restored …
This paper explores the definition, classification, coupling process and decoupling principle of multifactor risk in underground coal mine accidents. A multifactor risk measurement model based on coupling theory is proposed to measure the magnitude of the risk coupling effect using data of 375 major accidents from 2001 to 2016.
The EEGPs caused by coal mining are often the comprehensive effect of lithosphere, hydrosphere, biosphere, and coal mining conditions. To study the zoning for EEGPs in underground coal mining areas, the Yushenfu mining area was taken as an example. The mechanism of EEGPs caused by mining was elucidated, and four types of …
1. Introduction. Dust is generated in many industrial processes, such as coal mining, cement production, pharmaceutical production, and food transportation [1, 2].Dust in these workplaces may negative impact occupational health, causing skin diseases, respiratory diseases, pneumoconiosis, and so on [3, 4].With growing coal production, …
Despite being crucial for meeting the world's energy demands, coal mining operations present considerable health risks, especially when it comes to exposure to coal dust. Longwall coal mining, an advanced technique, has considerably enhanced production but made dust control more difficult. Due to its explosive nature, coal dust continues to be a …
1. Introduction. Worldwide, underground coal mining is recognized as one of the riskiest operations in terms of occurrences that can lead to fatal or nonfatal injuries (Sari et al., 2004, 2009; Paul, 2009; Shahriar and Bakhtavar, 2009; Onder et al., 2014).China is the largest underground coal producer in the world (Liu et al., 2016; Liu …
Currently, 35 coal mine underground water reservoirs have been established in the Shendong mining district and can cover 95% of the water used for industrial, domestic, and ecological uses in the ...
So coal is still an important energy source. To date most of the coal production is from underground coal mining operation. In the case of underground mining, the working space is relatively confined.
Deep rock mechanics & mining theory: Research progress: Technical system of in-situ rock mechanical tests Deep rock mechanics and mining method Experiential study of 3D virtualized mining [23] ... WSN technique in underground coal mines has potential to achieve transmission with high accuracy and reliability. Moreover, …
Grade control in underground mines aims to deliver quality tonnes to the process plant via the accurate definition of ore and waste. It comprises a decision-making process including data collection and interpretation; local estimation; development and mining supervision; ore and waste destination tracking; and stockpile management. The …
The triggering factors of coal and gas outburst disasters are complex and influenced by the coupling of gas, in situ stress, and mechanical properties of coal (Wang et al., 2022, Xue et al., 2020; Zhou et al., 2020a).At the early stage of mining, the basic parameters that are easy to test and directly related to the outburst risk are usually …
Therefore, the objectives of present study was focused to propose an approach of characterizing spatial variability of soil PSD in underground coal mining area combining multi-fractal theory and geo-statistical method, not considering the effects of different land subsidence and land rehabilitation stages. 2. Materials and methods2.1. …
The surface subsidence caused by underground mining is a global problem. The surface subsidence caused by underground mining attracted the attention of people in the mining field and related fields in the mid-19th century, and gradually formed the current mining subsidence prediction theory . In 1838, the Belgian engineer Gonot …
Underground mining. In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata. …
Mining. In Australia, nearly 80% of coal is produced from open-cut mines, in contrast to the rest of the world where open-cut mining only accounts for 40% of coal production. Open-cut mining is possible because coal seams are close to the surface. Such mining is cheaper than underground mining and enables up to 90% recovery of …
2.1 System Introduction. The technical method system for gob-side entry retaining, flat layer gas drainage, and not digging rock bottom pumping gas roadway of the rock is proposed on the basis of the existing construction of Lin Hua Coal Mine, which means that the technology of gob-side entry retaining is used to retain the return airway …
Step 3. For the sensor's reading, the sensor's output is connected to an Arduino analog input. So, the Arduino will read the input data from the sensors like the humidity and temperature of the room. …
This paper introduces a longwall mining attempt at Jining No. 3 Coal Mine. A solid backfill coal mining method was first applied to exploit the coal resources buried under the Nanyang Lake embankment.
The combustible and noxious gases are among the prominent issues affecting the life and the mining operations of underground coal mines (UCMs). Commonly adopted hazard monitoring methodologies in UCM are fuzzy, rule-based systems, statistical methods, and other expert systems, but these models are not reliable …
In order to clarify the impact of underground coal seam mining on the stability and slippage of the loess slope, theoretical analysis, numerical simulation and physical similarity simulation experiments are …