theory of underground coal mining

India is the second-largest coal producer globally, where 93.7% of coal is produced from opencast mining [], and the rest of the coal is produced from underground coal mining.With the high rate of extraction from opencast mining and the increase in the number of new open cast mining fields, it is essential to depend on underground coal …

The steady trend of complication of mining and geological factors in underground coal mining and at the same time the processes of mining intensification cause growth of dynamic manifestations of ...

The intended purpose of this Website is to provide a reference document for all aspects of underground coal mining in Australia (though there may be references to overseas practices where these could be of interest). The aim is to be of use to all levels of expertise from people with no, or at least a very limited knowledge of mining through to ...

DOI: 10.1016/j.ress.2021.107433 Corpus ID: 232041343; Analysis and measurement of multifactor risk in underground coal mine accidents based on coupling theory @article{Qiao2021AnalysisAM, title={Analysis and measurement of multifactor risk in underground coal mine accidents based on coupling theory}, author={Wanguan Qiao}, …

A coal burst event can be accompanied by an airblast or windblast, which may disrupt mine ventilation, throw out equipment and fragmented rock blocks, release strata gas and propagate explosive dust into the air. 1, 2 With the increasing depth of underground coal mining, coal extraction is facing ever-increasing stress conditions …

The problem of subsidence and damages on buildings above mining works is an inevitable consequence of underground coal mining in large mining basins. Significant development of various methods for prediction of the displacement parameters of the undermined terrain took place in the period from the middle of the last to the …

PDF | On Nov 1, 2016, Horst Wagner published Ground engineering - Principles and practices in underground coal mining | Find, read and cite all the research you need on ResearchGate.

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 …

ABSTRACT: Underground coal mining continues to evolve in the U.S., and more reserves are being mined under deeper cover, with worse roof, or with interactions from previous …

Written by an expert in underground coal mining and risk management, this book will help students and practitioners gain a deep understanding of the basic principles behind designing and ...

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 …

The decision on whether to operate an above- or underground mine is heavily influenced by a couple of important factors. The major factor in deciding on whether to go underground or open cut is the stripping ratio (Whittles et al. 2007).This is defined as the ratio of the volume of overburden (BCM) moved to the amount of coal produced …

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 …

In western China( Shanxi,Shaanxi,Inner Mongolia,Ningxia and Gansu),there are rich coal resources,while there are also water resource shortage. A surface evaporation capacity is above six times of rainfall. The largescale,intensive,modern coal mining can result in the formation of crack,destroy the original underground water system,and the generation of …

As one of the dynamic disasters of coal mines, rockburst seriously affects underground safe coal mining. Based on the laboratory test, field test, and theoretical analysis, this study proposed the principle of the rock burst induced by the combination of dynamic and static stresses and divided such rock burst into three types, including …

The calculation equation of mining loess slope slip with K ms as the key parameter is established by strata movement theory and probability integral theory, and a prediction method of loess slope surface movement and deformation in underground coal seam mining is designed. The deviation between the theoretical prediction results of the …

(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 …

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.

Underground coal mining has a strong disturbance on surrounding rock strata, causing inevitable water inflow into mined spaces, which seriously affects safety production. Mine water disaster is regarded as one of the most critical problems in coal mining and, thus, has been a research hotspot in coal mining. This review focuses on …

Based on underground pressure control theory, this paper expounds the distribution characteristics of abutment stress and the resulting damage to a coal seam in front of a working face. In addition, the distribution and propagation features of vertical underground pressure in floor strata is characterized by simulation results obtained from …

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 …

In western China( Shanxi,Shaanxi,Inner Mongolia,Ningxia and Gansu),there are rich coal resources,while there are also water resource shortage. A surface evaporation capacity …

It is shown that the underground coal mine reservoir is a safe, economical and scaled water storage technology, using natural underground space and natural …

The Coal Mine Health and Safety Act of 1969 [4] recognizes roof bolting as the sole means of underground entry (roadway) support.Subsequently with the development of roof bolters with rotary drilling, roof bolting for underground coal mine entry (roadway) support took off, replacing timber supports, and soon became the sole …

In this study, an optimization model was established based on the generalized contrastive weighted comprehensive scale index method. This model gives the evaluation indicators of SO2, NOx, CO, and TSP. It also innovatively introduces gas, the most harmful substance in underground coal mines, into the evaluation indicators. …

The research related to WRI in underground coal mining mainly focuses on the water inrush form roof and floor, water weakening of roadway surrounding …

An example study was conducted on a mine of a large state-owned coal mine enterprise in Shaanxi Province, China. The results show that the method helps coal mine enterprises to accurately assess gas explosion risks, identify weak links in risk prevention and control, and provide a powerful means for continuous improvement of risk …

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 …

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 …

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 …

Underground coal mining means more deadly hazards due to confined spaces, toxic and harmful gases, mine water, machinery, surrounding rock, and other dangerous sources . These hazards lead to significant casualties, environmental degradation, and coal resource depletion. ... The theory of coal oxygen compounds has …

The underground coal mine reservoir utilizes overburden fractures caused by mining to direct water from the aquifer into the goaf, creating a sealed …

The overburden subsidence induced by underground mining has caused great damage to the ecological environmental and seriously threatens the safe use of underground structures. Focusing on the overburden subsidence, this paper uses theoretical analysis method to study the overburden subsidence boundary with a …

The following topics are addressed in twelve chapters: scope of ground engineering, fundamental principles of ground engineering, excavation …

Mining conditions of the target coal mine. Zhaogu mining area locates at Xinxiang city of Henan province, China. There are two underground coal mines existing in this area as shown in Fig. 1, among which the second one is the target mine of this study.The mine is located at the Lower Yellow River, where North China Plain is formed …

A systematic method was developed to evaluate the risk of water inrush through a coal seam floor using the geographic information system (GIS) and the fuzzy set theory. The main geological and hydrogeological indicators that control water inrush were first considered using a fuzzy mathematics approach, in which fractal analysis was …

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 …