Opening: 00AM - 24PM
Highwall mining of thick, steeply dipping coal–a case ...

Sep 01, 2019 · For thick seams, production may be increased by mining cross-seam, cutting vertically across the seam at a flatter dip, to obtain greater penetration depth. The machine may ultimately contact the seam roof before maximum penetration is achieved; therefore, the opening should be initiated at the base of the seam to optimize penetration.

Get Price
Research on Surface Failure Law of Working Faces in Large ...

In the initial mining stage of working face 52307 in the Daliuta Mining Area, there is a stratum of fine sandstone about 31 m thick above the working face. Then this stratum is determined as the main key strata of the working face by the discriminant condition.

Get Price
Dynamic Changes in Surface Damage Induced by High ...

This study proposes a novel approach to study the mechanism of mining and dynamic changes in surface subsidence and geological hazard-prone regions caused by shallow, thick coal seam mining in gully areas. This approach combines field observation, three-dimensional modeling, numerical simulation, and theoretical analysis based on the conditions of the Chuancao Gedan coal mine.

Get Price
Control of the Chamber in Extra-Thick Coal Seam Based on ...

The main coal seam of those modernized mines exploits generally thick and extra-thick coal seams [3, 4]. Due to the large coal output of these mines, the sections of underground electromechanical chambers, gangue washing chambers, and assembly chambers are usually above 70 m 2 . When the coal seam is thick and the strength is high, the chamber ...

Get Price
Thick Seam Mining Techniques In Japan - AusIMM

Practices of thick seam mining methods experienced in Taiheiyo Coal Mine. Currently, thick single lift, simultaneous lift and non simul- taneous lift mining methods are adopted as underground flat thick seam excavations in Japan. These are now reliable and effective in increasing the extraction ratio.

Get Price
Black Country - Wikipedia

Coal mining was carried out for several centuries in the Black Country, starting from medieval times, and metalworking was important in the Black Country area as early as the 16th century spurred on by the presence of iron ore and coal in a seam 30 feet (9 m) thick, the thickest seam in Great Britain, which outcropped in various places.

Get Price
Safe strategy for coal and gas outburst prevention in deep ...

To verify the pressure relief of the soft rock layer mining on deep-and-thick coal seams, the FLAC 3D numerical simulation method was used to analyze the stress distribution and deformation of the coal seam under the protection of the soft rock protective layer and 0 coal seam protective layer.

Author: Liang Wang, Zhuang Lu, Da-peng Chen, Qing-quan Liu, Peng Chu, Long-yong Shu, Barkat Ullah, Zhi-jie W...Get Price
Research on Surface Failure Law of Working Faces in Large ...

In the initial mining stage of working face 52307 in the Daliuta Mining Area, there is a stratum of fine sandstone about 31 m thick above the working face. Then this stratum is determined as the main key strata of the working face by the discriminant condition.

Get Price
EXTRACTION OF THICK COAL SEAM - National Institute of ...

2.1 Problems associated with mining of thick coal seams 16 2.2 Methods of mining thick coal seams 16 2.2.1 Slice mining 17 2.2.2 Sublevel caving method 18 2.2.3 Integral caving method 19 2.2.4 Blasting Gallery method 21 2.2.5 Thick seam mining with cable bolting 22 2.3 Numerical Modelling 23 2.3.1 Comparison with other methods 24

Get Price
CN1190693A - All thickness coal mining method for seam ...

CN1190693A - All thickness coal mining method for seam misplaced coal tunnel distribution on thick seam - Google Patents In coal seam the intake (generally, at the same time it also is haulage...

Get Price
Splits, Coal Mining Geology, Kentucky Geological Survey ...

Sep 18, 2019 · Splits commonly thin laterally into a persistent and relatively thick parting in the coal. Split in the Whitesburg coal seam in eastern Kentucky. Discontinuities and obstacles: Splitting causes major obstacles to mining and often permanent lateral barriers to mining in the direction of splitting. Splitting commonly results in a change in seam ...

Get Price
Longwall Mining in Seams of Medium Thickness

2 Underground mining in low seams Mining of low seams will be more important in the future because thick seams have been mined intensely in the past. Therefore, there are numerous reserves of high-quality coal remaining in thin seams. Fig. 2 presents the distribution of reserves as the function of seam thickness in the German Ruhr District [7].

[PDF]Get Price
Thick Seam Mining Techniques In Japan - AusIMM

The author describes 1. The classification and characteristics of various thick seam mining techniques in various Japanese coal mines. 2. Practices of thick seam mining methods experienced in Taiheiyo Coal Mine. Currently, thick single lift, simultaneous lift and non simul- taneous lift mining methods are adopted as underground flat thick seam excavations in...

Get Price
EXTRACTION OF THICK COAL SEAM - National Institute of ...

2.1 Problems associated with mining of thick coal seams 16 2.2 Methods of mining thick coal seams 16 2.2.1 Slice mining 17 2.2.2 Sublevel caving method 18 2.2.3 Integral caving method 19 2.2.4 Blasting Gallery method 21 2.2.5 Thick seam mining with cable bolting 22 2.3 Numerical Modelling 23 2.3.1 Comparison with other methods 24

Get Price
Effect of Mining Thickness on Overburden Movement and ...

Abstract Because the coal seam is particularly thick and the mining intensity is large, the mining of extremely thick coal seams often causes a wide range of disturbed fractures, which in turn induces the phenomenon of strong underground pressure such as induced support crushing and water inrush.

[PDF]Get Price
Field and simulation study of the rational coal pillar ...

1 INTRODUCTION. Longwall mechanized top coal caving mining (LMTCCM) is the most universal method for the mining of extra‐thick coal seams in China. 1 A gob‐side entry (GSE) as walking, ventilation, and transportation passage is extremely important for the efficient production and safety of coal mines. 2 The coal pillar width directly affects the stability of the GSE. 3 The importance of ...

Get Price
The Mechanism and Control Technology of Strong Strata ...

The No.3-5 extra-thick coal seam of Carboniferous system is mainly mined in Tashan coal mine. The burial depth and thickness of No.3-5 coal seam are 400m to 600 m, 15m to 20 m, respectively. The No.3-5 coal seam was mined by the method of caving mining, as the mining height was 3m to 5m and caving height was 10m to 17m.

Get Price
Study on Coal Pillar Width and Surrounding Rock Control of ...

This paper adopts an integrated method of field test and numerical simulation to study coal pillar width and surrounding rock control of gob-side entry in extra-thick coal seam. Field test showed that when the coal pillar width was 30 m, the average plastic failure areas of the roof, coal pillar rib and coal rib were 7.6 m, 4.9 and 3.8 m, respectively, and severe roof subsidence and ...

Get Price
Longwall Mining Method and Design

Wilson cites foreign experiences with lift thick-seam mining and presents design considerations. Probably the most important factor in simultaneous extraction of two seams is co-ordination. Gate road development and longwall panel extraction in both mines should be .

Get Price
Fully mechanized coal mining technology for thin coal seam ...

seams with thickness of 0.8~1.3 m are in the thin coal seam group and thickness of less than 0.8 m are in the extremely thin coal seam group (Chai, 2007; Dong and Pan, 2008). With the decreasing of coal resources with seam thickness in the middle to

Get Price