The concept of a thick seam varies from country to country, the basis for the lower limit of a thick seam being the thickness up to which a seam could be extracted in one lift (pass) with the available equipment and technology . In India, over 60% of coal reserves are thick seams, and a considerable % of coking coal belongs to thick seams.
For thick coal seams, if the interlayer spacing is large and there is a thick hard roof, reducing the mining height of the first level can lower the static stress on the gob-side coal seam. At the same time, backfilling is also an effective method to control the development height of the collapse zone, thereby reducing the subsidence of the ...
law of gas migration in the bottom coal of the horizontal slicing mining face in steeply inclined and extra-thick coal seams. At the same time, it has important theoretical and practical Figure 1. Proportion of gas emission from the bottom coal of the horizontal slicing mining face in steeply inclined and extra-thick coal seams.
Although the future of coal mining lies belowground, the present status of Indian underground (UG) mining and, in particular, thick seam mining is not inspiring. Thick seams share about 40% of the proven Indian coal reserves. However, several consistent efforts were...
DOI: 10.1016/j.jappgeo.2022.104774 Corpus ID: 251364709; Comprehensive research on the failure evolution of the floor in upper mining of deep and thick coal seam @article{Liu2022ComprehensiveRO, title={Comprehensive research on the failure evolution of the floor in upper mining of deep and thick coal seam}, author={Chang Liu and …
thick seam mining, this problem becomes very high. Further heavy coal loss takes place in bord and pillar mining. Therefore, longwall mining (with multi slicing) is the preferred method of mining for extraction of coal from thick seams. This is also suitable for mining thick as well as steep seams. However, BG
In India, over 60% of all known coal reserves are contained in thick seams. Some of these thick seams are nearly 30 m thick. One exceptionally thick seam in Singrauli Coalfield is 162 m thick.6 2. REVIEWS 2.1. Problems associated with mining of thick coal seams Following problems are associated with thick seam mining
Although the future of coal mining lies belowground, the present status of Indian underground (UG) mining and, in particular, thick seam mining is not inspiring. …
Thick coal seam is the main coal seam to achieve high efficiency coal mining. In this chapter, the common mining methods for thick coal seams are …
The Indian thick seam coal mining by underground methods evolved with tremendous growth in terms of production and technology and the 21st century witnessed mile stones. ... 2395-0072 3 Jhanjra Project, ECL R VI, 4.8m 4.5 4 Khottadih ug Project, ECL PVK 5 Incline, SCCL GDK 11 Incline, SCCL Santhikhani, SCCL R VI,4.8m 4 King Seam ...
Ultra-thick steep coal seam mining will inevitably lead to the increase of greater and violent ground subsidence and deformation. A subsidence control method by inversely-inclined slicing and upward mining is proposed in this paper. By this method, the sequence of collapse of overlying strata and the direction of propagation of strata …
Gob-side entry retaining (GER) was tested and applied in the UK, Germany, Poland, and Russia in the past few decades, while GER is widely applied in coal mining in China [1,2,3,4,5,6,7].GER is a safe, green and efficient mining technology with advantages including reduced excavation rates, relief of the rapid movement of mining activities, …
The coal seam mined at the S1201 mining panel is the Jurassic Middle Yan'an Formation coal seam, with a thickness of 3.95–4.45 m and a designed mining height of 4.17 m, which belongs to the category of thick coal seam. The coal seam has a dip angle of 0°–2° and a burial depth of 80–160 m. The width of the test mining panel is …
Along with it, a prospect of thick seam mining by mechanized longwall and its variants like Longwall Top Coal Caving (LTCC), Sub-Level Caving, etc. is proposed as a future thick seam mining method ...
Thick coal seam is the main coal seam to achieve high efficiency coal mining. In this chapter, the common mining methods for thick coal seams are introduced. There is a large-cutting-height mining method and a top-coal caving mining method. Also, the ground control for the thick coal seam mining is described in this chapter.
1. Introduction. China's current coal-based energy consumption structure is determined by the resource endowment characteristics of 'rich in coal, poor in oil, and little in gas' (Li et al., 2020).As the coal resources in the mining areas of eastern China have been exploited for a long time, the mining depth has become deeper and the mining …
The study describes the strata mechanics and convergence monitoring while depillaring in a single lift of thick coal seam by cable bolting method. Based on the rock mechanical investigation, the use of a 19-mm diameter rope as support was applied to hold the immediate roof over the coal seam. The field application was carried out in …
Moreover, the annual mining amount of underground thick coal seams accounts for about 40% to 50% of the national coal production each year. To achieve high yield and high efficiency in the mining areas of extra-thick coal seams, the fully mechanized caving mining technology has become the dominant technical approach …
In this study, we discuss the applicability of IUAMM-based fluidized mining technology to thick-seam coal recovery, and its potential impacts on geological …
characteristics in deep thick loose seam and thick coal seam mining, Geomatics, Natural Hazards and Risk, 11:1, 632-653, DOI: 10.1080/19475705.2020.1737584 To link to this article: https://doi ...
Detecting the development height of the water-flowing fractured zone in the overburden of coal seam is of great significance for the overburden safety of working face with developed sandstone and thick loose layer. In this paper, the dual-mode parallel electrical method was used for dynamic monitoring of overlying rock in shallow and large …
DOI: 10.1016/J.JAPPGEO.2021.104337 Corpus ID: 234877180; Research on the overburden deformation and migration law in deep and extra-thick coal seam mining @article{Binyang2021ResearchOT, title={Research on the overburden deformation and migration law in deep and extra-thick coal seam mining}, author={Sun Binyang …
The thick coal seam reserves are abundant in China, accounting for 44% of the total reserves, of which extra-thick coal seams account for more than 50%, and the annual output of thick and extra-thick coal seams accounts for more than 45% of the total annual output (Wang 2013).As the main coal seam, the extra-thick coal seam has a …
Underground extraction of thick coal seams in United States of America is not much visible in literature. However, application of hydraulic mining for thick coal seams in New Zealand has shown good results [7], [36] but for a scanty band width of the geo-mining conditions. This approach offered considerable financial benefits, but has …
This paper reviews underground mining methods for total thickness of a thick coal seam in single lift (TTTCSSL). Review shows the required engineering for …
The mining-induced failure of the coal seam floor is essential for water inrush. The mining disturbance to the floor, especially in the thick coal seam, is severe, and the water inrush risk is also higher than that in regular thick coal seam excavation. The superposition of many stresses, including in situ stress, mining-induced stress, and …
A coal seam is a dark brown or black banded deposit of coal that is visible within layers of rock. These seams are located underground and can be mined using either deep mining or strip mining techniques depending on their proximity to the surface. These seams undergo normal coal formation and serve as a conventional coal resource.The reserves of coal …
The evolution of thick coal seams mining methods in China Qiao Jianyong1,2, Wang Zhiqiang*1, Zhao Jingli1 1China University of Mining and Technology (Beijing) Ding 1 Xueyuan Road, Haidian District, Beijing China, 100083 2Beijing University of Posts and Telecommunications 10 Xitucheng Road, Beijing, China, 100876 Abstract.The article is …
High Wall Mining : This technology is suitable for thin (minimum 0.9m) and moderate coal seams where neither opencast nor the conventional underground mining methodology is possible to exploit the coal seams economically. It enables recovery of coal from surface pits that have reached the final high wall position due to uneconomic stripping ...
The thick coal seam mining method prediction model based on artificial neural network (TCSMMPM-ANN) was established through the analysis of thick coal seam mining by using Levenberg – Marquardt (L-M) improved algorithm to train network, the simulation results of network test show that this model can provide a new research idea …
India has huge untapped potential for underground (UG) mining with extractable reserve up to a depth of 600 m. Production from UG mines in India by longwall (L/W) method is meagre, about 4% of ...
The major candidates of MPT in underground coal mining are longwall, high wall, and continuous miner. However, these methods are mostly applicable to medium …
In the thick of wanbei mining area coal seam fully mechanized hydraulic support adaptive study. Etc Wang; Journal of determining the rational supporting intensity, coal mining. Hao Cunyi Duan;
The no. 3–5 extra-thick coal seam is mainly mined in the Tashan coal mine of the Datong mining area; the coal seam thickness ranges from 14 to 20 m and the burial depth ranges from 400 to 800 m. The overlying rock comprises multiple hard roofs with compressive strengths of 60–120 MPa.
Ultra-thick seams in this article refer to those equal to or greater than 6-m (20-ft) thick, but the majority are seams that are 7-m (23-ft) thick. For seams that are this thick, there are two major mining methods; one is top coal caving that was first adopted in the 1980s, while the other is the ultra-thick whole seam one-slice longwall mining ...
A novel method for UG extraction of a critically thick coal seam standing on pillars and the development made along the roof horizon. Minetech 23, 1, 2, and 3–11 (2002) A. Kushwaha, S.K. Singh, S. Tewari, A. Sinha, Empirical approach for designing of support system in mechanised coal pillar mining.
The (LTCC) method is used extensively deployed for extracting thick and extra thick coal seams in China with more than 100 faces producing over 200 MT in conditions ranging …
Gob-side entry retaining (GER) is a popular non-pillar mining technique regarding how to reserve a gateroad for the use of next panel mining. When used in thick coal seams, the conventional entry retaining method requires a huge amount of filling materials and may cause entry (gateroad) accidents. Thus, an innovative non-pillar longwall mining …
A coal seam is considered thick, if the entire seam thickness cannot be extracted in a single lift with available equipment and technology. In India, seams more than 4.8m are …