scholarly journals The evolution of thick coal seams mining methods in China

2020 ◽  
Vol 192 ◽  
pp. 01023
Author(s):  
Qiao Jianyong ◽  
Wang Zhiqiang ◽  
Zhao Jingli
Keyword(s):  
Coal Mining ◽  
Spontaneous Combustion ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Recovery Coefficient ◽  
Increased Risk ◽  
Geological Conditions ◽  
Mechanized Method ◽  
Full Capacity ◽  
The Moment

The article is shown that the main methods used in China for coal mining from thick seams at the moment are two methods the Complex mechanized method of developing seams at their full capacity (used only in simple geological conditions and is an additional method for the following) and Complex mechanized mining method with coal production (which is used mainly, including in difficult conditions). Despite the fact that these methods have positively proven themselves over the years, their use has a number of significant drawbacks, including a low extraction rate, an increased risk of endogenous combustion and rock burst, and others. Currently, a promising way is a development method with a diagonal (cross-shaped) arrangement of drifts, which helps to eliminate many of the shortcomings of previous methods, including a low recovery coefficient, the risk of spontaneous combustion, the need to support the drift and others. It is expected that this method will be widely used for underground coal mining in deep mines in China with difficult mining and geological conditions.

Development of the properties of adaptability of the support sections of treatment complexes to variable mining and geological conditions

2021 ◽  
Vol 326 ◽  
pp. 00024
Author(s):  
Vasilisa Teremetskaya ◽  
Viktor Gabov
Keyword(s):  
Coal Mining ◽  
High Performance ◽  
Operating Conditions ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Functional Capabilities ◽  
Geological Conditions ◽  
Wide Range ◽  
Favorable Conditions ◽  
Working Out

In modern conditions, intensive underground coal mining is provided, as a rule by working out the dredging sections of coal seams with long cleaning faces using high-performance mechanized complexes. They consist of a dredging machine, a conveyor and a set of sections of mobile mechanized support (SMS). SMS, supporting the roof, controlling the mountain pressure (MP) and protecting the bottom-hole space, provide conditions in complex mechanized treatment faces (CMTF) for efficient and safe coal mining. However, the potential capabilities of modern complexes significantly exceed the values of efficiency indicators achieved when using them in operating conditions. One of the reasons for this situation is the insufficient adaptability of the SMS to the mining and geological conditions (MGC) changing in a wide range as the excavation sites are worked out. Therefore, at present, studies of the possibility of developing the properties of adaptivity (kinematic, power, contact, technological) of the SMS to the MGC variables are relevant. Their results will contribute to the expansion of the functional capabilities of the SMS to maintain favorable conditions in complex mechanized treatment faces for the effective operation of the mechanized treatment complex (MTC) in variable mining and geological conditions.

scholarly journals Methane Content Estimation in DuongHuy Coal Mine

2018 ◽  
Vol 35 ◽  
pp. 01005 ◽  
Author(s):  
Van Thinh Nguyen ◽  
Waldemar Mijał ◽  
Vu Chi Dang ◽  
Thi Tuyet Mai Nguyen
Keyword(s):  
Experimental Data ◽  
Coal Mining ◽  
Coal Mine ◽  
Coal Mines ◽  
Methane Content ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Underground Coal Mine ◽  
Different Depths ◽  
Quang Ninh

Methane hazard has always been considered for underground coal mining as it can lead to methane explosion. In Quang Ninh province, several coal mines such as Mạo Khe coal mine, Khe Cham coal mine, especially Duong Huy mine that have high methane content. Experimental data to examine contents of methane bearing coal seams at different depths are not similar in Duong coal mine. In order to ensure safety, this report has been undertaken to determine a pattern of changing methane contents of coal seams at different exploitation depths in Duong Huy underground coal mine.

scholarly journals Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

Interaction of risk-based approach and best available technologies in the environmental supervision system for underground coal mining

2020 ◽  
pp. 46-54
Author(s):  
V. Yu. Grishin ◽  
N. P. Udalova ◽  
P. P. Manevich
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Negative Impact ◽  
Regulatory System ◽  
Risk Category ◽  
Underground Coal Mining ◽  
Best Available Technologies ◽  
Mining Enterprise ◽  
Geological Conditions ◽  
The Russian Federation

The volume of coal mining by underground method in the Russian Federation is about 100 million tons annually and has no tendency to decrease. At the same time, with the development of underground mining, there is a constant complication of mining and geological conditions and an increasing negative impact on the environment. Over the past three years, there have been significant changes in the area of state environmental oversight. Some of them are the introduction of a risk-based approach and the best available technologies into the Russian regulatory system. Now it is legislatively established that development, introduction and application of the best available technologies in a life cycle of the coal-mining enterprise can serve as the basis for lowering of a risk category of coal-mining object. In turn, this should encourage the subsoil user to promote and implement environmental policy at their enterprise. In article features of introduction of risk-oriented approach and the best available technologies and an estimation of prospects of introduction of such methods at the underground coal-mining enterprise are considered. As a result of the analysis the hierarchy of relations of modern legislation in the sphere of ecological supervision, coal-mining enterprise, its possibilities on development of the best available technologies and branches of decisions according to the riskoriented approach is presented.

scholarly journals 3D modelling of coal seams for optimization of extraction

2021 ◽  
Vol 342 ◽  
pp. 02008
Author(s):  
Ábel Dániel Antonovits ◽  
József Molnár
Keyword(s):  
Coal Mining ◽  
Three Dimensional ◽  
Cost Effective ◽  
Eastern Region ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
The North ◽  
Comprehensive Knowledge ◽  
North Eastern

Underground coal mining was finished in the north-eastern region of Hungary after its operation of more than two centuries, as a result of economic, technical, environmental and political reasons. A fairly significant part of the reserve is still available to extract. With a different perspective of coal mining, considering different ways of utilization (such as coal chemistry, etc.) the extraction of the material can still be cost effective. In the past few years, several studies were conducted regarding the possible utilization of the available reserve. The properties of the coal are highly mutable, therefore, comprehensive knowledge about the geology is indispensable. Two and three-dimensional modelling of the coal seam is discussed in this paper, with the optimal coal face height, and the expected quality of mining products taken into consideration. Applying the method presented, the production can fulfil the desired properties, regarding to the utilization of the coal.

scholarly journals Control of the Internal and External Staggered Distance of Coal Mining Face to the Water-Conducting Fissures in the Overlying Strata of the Near Coal

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhiyuan Jin ◽  
Tao Peng
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Coal Mine ◽  
Calculation Formula ◽  
Coal Seams ◽  
Coal Face ◽  
Geological Conditions ◽  
Mining Face ◽  
Seam Mining ◽  
Water Proof

In Northwest China, rainfall is low, water resources are scarce, and the ecological environment is fragile. For shallow-buried and close-spaced coal seams with a thickness of upper coal bed >60∼70 m, the water-conducting fissures of the overlying rock will not penetrate the water-isolating layer after the upper coal seam is mined; the internal and external gap angles of the water-conducting fissures are not generated from the water-isolating layer. We set out to explore the critical internal and external dislocations for the second significant development of water-conducting fissures in the overlying rock after coal mining under control. A calculation model for the critical internal and external staggered distances of coal mining face in shallow-buried and close-spaced coal seams is established, the calculation formula is given, and the calculation formula for the critical seam mining ratio under the condition of internal staggered mining mode is given. Numerical simulation performed by UDEC methods: taking the overburden strata in the shallow-buried and close-spaced coal seam mining area of Shigetai Coal Mine as a prototype, it was verified that the critical internal and external offsets of the coal mining face in shallow-buried and close-spaced coal seams have a significant effect on the overlying water flow cracks in the mining of the lower coal seam. For the feasibility of developmental control, according to the engineering geological conditions of Shigetai, through the calculation method of external staggered distance, it is concluded that the distance of the open cut of the lower coal face and the upper coal face is only 21∼27 m, which is much smaller than the water barrier. It does not produce the critical distance of the water-conducting cracks. Therefore, in the process of mining the lower coal seam, the water-proof layer will produce water-conducting cracks, lose its water-proof performance, and cause water loss. This is also the cause of the water inrush accident in Shigetai Coal Mine.

scholarly journals Allocation of the geo-dynamically hazardous zones during intensive mining of flat-lying coal seams in the mines of SUEK-Kuzbass JSC

2019 ◽  
Vol 134 ◽  
pp. 01022
Author(s):  
Evgeny Yutiaev ◽  
Anatoly Meshkov ◽  
Anton Popov ◽  
Arcady Shabarov
Keyword(s):  
Rock Mass ◽  
Coal Mining ◽  
Coal Mines ◽  
Coal Industry ◽  
Comprehensive Approach ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Technological Level ◽  
The Cost

Hazardous and ineffective mines were closed, and a number of underground and strip mines of a modern technological level were built as a result of the restructuring of the coal industry in Russia. However, safety in the coal mines continues to be one of the urgent issues nowadays. In underground coal mining, the main types of risks are processes occurring in the rock mass as a result of mining operations. It is necessary to realize timeous and the most accurate prediction of harmful events, which occur during a development of coal fields, to increase the efficiency and reduce the cost of coal mining. The most optimal and, at the same time, comprehensive approach to predicting possible natural hazardous events in the process of modern coal mining are considered in this article. The results of implementation of integration of different methods of geodynamic and geomechanics researches are presented in this paper.

Methane content and relative methane releasability versus occurrence depth of coal seams in Mạo Khê mine

2020 ◽  
pp. 26-37
Author(s):  
Dik Thang Fam ◽  
Tuan An’ Fan ◽  
K. S. Kolikov
Keyword(s):  
Coal Mining ◽  
Mine Drainage ◽  
Mining Industry ◽  
Methane Content ◽  
Gas Content ◽  
Coal Seams ◽  
Methane Drainage ◽  
Geological Conditions ◽  
Coal Reserves ◽  
Full Conversion

Methane is one of the critical safety concerns in the modern coal mining industry. The current outputs per coal faces induce risk of explosion even at low gas content of coal. Methane drainage is an obligatory component of a coal mining technology; it enables full conversion of coal resources into coal reserves, safe operation of coal mine and utilization of coal methane. The approaches to introduction of norms on methane concentration in return ventilation air and to rating of coal mines by the gas criterion in the leading coal-producing countries are reviewed. Based on the analysis of underground measurements, the content and relative releasability of are estimated as functions of the occurrence depth of coal seams in Mạo Khê mine. The methane content-occurrence depth curves are obtained. Considering the geological conditions of the mine, the promising degassing technologies based on enhancement of coal permeability are discussed, and the required modification of standards to be imposed on geological exploration data for the purpose of introduction of new methane content prediction methods is described. The main problems of pre-mine drainage of methane are examined. The urgent nature of methane drainage in Mạo Khê mine is validated.

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