Evolution of mining‐induced stress in fully mechanized top ...

2020-2-22 · Therefore, Wangjialing Coal Mine was under high horizontal stress. Under high horizontal stress, due to influence of mining, the maximum principal stress was equal to the intermediate principal stress in top‐coal at 24 m along the measuring line, that is, σ 1 = σ 2. Three principal stresses were concentrated in top‐coal in front of the ...

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Subsidence from Underground Mining: Environmental …

2010-10-30 · effects of underground mining. The major em­ phasis is on coal mining. The time to plan for subsidence impacts is well before mining begins, not after surface effects are noticed. Because subsidence due to underground mining may be inevitable, the relevant questions to be asked are how much, when, and where, and

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KGS--Coal Resources of the Douglas Group--Geography ...

2021-1-16 · Shaft mining has been used more successfully than other methods in mining Douglas coal beds, because it allows the miner to remove coal economically from a much larger area. Under most favorable conditions a drift mine allows working of only a semicircular coal face. In contrast, shaft mining allows working of a full circle coal face (fig. 7).

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Evolution Characteristics of Pressure-Arch and Elastic ...

Abstract: To ensure safety mining during shallow horizontal coal mining based on the monitoring data of the roof weighting of a typical mining engineering in China, the load distribution characteristics of the roof in the mining field were analysed, and the mechanical model of the pressure-arch in the surrounding rock was established.

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Three Dimensional Numerical modelling Of Coal Mine ...

2018-9-21 · An investigation was undertaken on the detrimental effects of high horizontal stresses for a coal mine roadway. The analysis is carried out using Rocscience''s new three dimensional FEM program RS3. The model parameters were obtained from two mine fields from UK and India. Initially a simple model of a coal mine roadway was created,

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Evolution of mining‐induced stress in fully mechanized top ...

Therefore, Wangjialing Coal Mine was under high horizontal stress. Under high horizontal stress, due to influence of mining, the maximum principal stress was equal to the intermediate principal stress in top‐coal at 24 m along the measuring line, that is, σ 1 = σ 2. Three principal stresses were concentrated in top‐coal in front of the ...

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China Metallurgical Engineering & Project Corporation- ...

China Metallurgical Engineering & Project Corporation (MEPC) is a diversified Engineering and Project Group Corporation with vertical portfolios in Metallurgy, Mining, Coal & Coking, Energy and Non-Ferrous Metal, etc..MEPC''s principal activities are in proven technology, engineering, consultancy, supply, project contracting as well as financial

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Regional horizontal stress and its effect on longwall ...

1995-11-1 · Controlling coal mine roofs subjected to high-horizontal stress conditions has always been difficult and uncertain. Traditional supports such as wooden cribs and posts, concrete donut cribs, and standing supports collapse and fail when the roof and floor move horizontally as mining progresses.

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(PDF) Evolution Characteristics of Pressure-Arch and Elastic E…

CDC - Mining Topic - Horizontal Stress - NIOSH

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Coal Burst Induced by Horizontal Section Mining of a ...

LW5521-20 is the 20th section (+1400 m in the horizontal direction and at 520 m mining depth) of the No. 5 mining area in Yaojie No. 3 Coal Mine in which the width of the working face, the thickness of the section, mining height, caving height, and mining-caving ratio were 68 m, 14.5 m, 2.8 m, 11.7 m, and 1 : 4.18, respectively.

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STUDY ON EVOLUTION CHARACTERISTICS OF …

2020-11-6 · multi-horizontal sectional mining in steeply inclined coal seams are studied. Based on the typical engineering background of steeply inclined coal seams mining in Wudong Coal Mine, the physical simulation model is build. The evolution charac-teristics of overburden caving and void during multi-horizontal sectional mining is

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Directional Drilling

Diagrams showing (A) vertical and horizontal drillholes drilled at various radii or arcs into horizontal coal beds and (B) slant directional drillholes in front of coal mining in order to drain the coalbed gas from a vertical well in Australia. Source: Diagram (B) courtesy of Dave Mathew.

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Mechanism of Coal Bump among Mine Group under the ...

2021-7-8 · The vertical stress of the 13230 face is relatively low at the beginning, and high horizontal stress by fault activation causes typical bump accident with the horizontal sliding of coal body. With the increasing development of 13230 face, the intensity and frequency of coal bump in horizontal direction decrease obviously, but with high proportion in vertical direction.

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Vertical stress and stability of interburden over an ...

Upward mining of residual coal seam No. 6 over the abandoned pillar working has become a focus in recent years due to the lack of coal resources. However, it is restricted by the stability of residual coal pillars and the interburden, which are closely related to mining feasibility and safety.

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2020-5-27 · BBR study of top-coal drawing law in longwall top-coal caving mining. Journal of the China Coal Society, 2015, 40(3): 487-493. (10) Wang JC, Zhang JW, Yang SL, Song ZY. 3-D movement law of top-coal in near horizontal coal seam with multi-gangue under caving mining technique.

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Analysis of main factors influencing the apertures of ...

2020-4-17 · Large mining-induced fractures can conduct or accumulate the significant volume of methane and water, and also may cause concentrated deformations of the rock mass and ground surface. In this paper, analysis of main factors influencing the apertures of mining-induced horizontal fractures at longwall coal mining …

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Horizontal-Regional Stress, Coal Mining Geology, Kentucky ...

2019-9-19 · Horizontal-Regional Stress. The stress field caused by continental-scale tectonic motion of the earth''s crust is called the "regional stress field." The regional stress field creates directionally oriented horizontal stresses in the crust, called "in-situ stress." Fractures resulting from horizontal stress commonly form in mines as rib ...

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(PDF) Evolution Characteristics of Pressure-Arch and ...

PDF | To ensure safety mining during shallow horizontal coal mining based on the monitoring data of the roof weighting of a typical mining engineering... | Find, read and cite all the research you ...

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Mechanisms of Rock Burst in Horizontal Section Mining of a ...

2020-11-19 · Rock bursts have recently become a serious problem in the horizontal section mining of steeply inclined extra-thick coal seams (SIETCSs). However, few studies have been carried out to investigate their mechanisms and prevention. In this study ...

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EuroCMA

EuroCMA for the global mining companies, thermal power plant, bulk cargo terminal, container transport enterprises specialized in designing, manufacturing and mining activation feeder leading position. Accessory. EuroCMA can produce all kinds of …

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Waterjetting 22a

2014-6-10 · Waterjetting 22a – Mining horizontal coal. Posted on June 10, 2014. April 10, 2018. by Energy Writer. 10. Jun. Over the last few posts I have discussed some of the problems that arise in dealing with the use of waterjets in mining coal, when the material mined has to be collected and transported away from the face where the coal is extracted.

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Mechanisms of Rock Burst in Horizontal Section Mining of a ...

Rock bursts have recently become a serious problem in the horizontal section mining of steeply inclined extra-thick coal seams (SIETCSs). However, few studies have been carried out to investigate their mechanisms and prevention. In this study, numerical simulation and field measurements were carried out to investigate the mechanism of rock bursts in the horizontal section mining of an SIETCS.

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CDC

Mining Publication: Global Trends in Coal Mine Horizontal Stress Measurements. Keywords: ... During the past 20 years, it has become clear that horizontal stress is a critical factor affecting roof stability in underground coal mines. The theory of plate …

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Horizontal Coal Mining Slurry Pump Manufacturers and ...

Horizontal coal mining slurry pump. Coal mining slurry pump is high efficient transfer of abrasive and high density slurries with extended wear life and reliable service intervals. All Milestone MAH coal mining slurry pumps are designed to be fully …

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mining

mining - mining - Horizontal openings: drifts: All horizontal or subhorizontal development openings made in a mine have the generic name of drift. These are simply tunnels made in the rock, with a size and shape depending on their use—for example, haulage, …

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Review of Horizontal Surface Movements Due to Longwall ...

2020-10-13 · 2016 Coal Operators'' Conference The University of Wollongong 10 –12 February 2016 213 REVIEW OF HORIZONTAL SURFACE MOVEMENTS DUE TO LONGWALL COAL MINING USING NUMERICAL MODELLING James Barbato1, Bruce Hebblewhite2, Rudrajit Mitra3 and Ken Mills4 Strain is an important parameter for assessing the potential for impacts on surface features due to ...

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Glossary of Coal Mining Terms

2020-5-20 · Butt cleat - a short, poorly defined vertical cleavage plane in a coal seam, usually at right angles to the long face cleat. Butt entry - a coal mining term that has different meanings in different locations. It can be synonymous with panel entry, sub-main entry, or in its

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Underground Mining Methods and Equipment

2020-8-25 · Longwall mining is used in horizontal, tabular deposits (mainly coal), while the others have applications in inclined or vertical, massive deposits, a lmost exclusively metallic or nonmetallic. Because the exploitation openings are intentionally destroyed in the progress of mining, the caving class is truly unique. Rock mechanics principles are

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Gas Drainage Technology in Fully Mechanized Caving Face ...

Due to the characteristics of horizontal sub-level fully mechanized top-coal caving face in steeply inclined super-thick coal seam, such as large mining and caving ratio, difficult control of top-coal, self-unloading gas desorption and migration of bottom coal body, more coal remaining in Goaf, etc., as a result, the work of gas prevention and ...

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CDC

 · High horizontal stresses produce extensive and sudden rock failures. The U.S., Australian, and United Kingdom coal and the Canadian hard rock industries have long recognized the significance of high horizontal stresses as a factor affecting the …

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Case study on the mining‐induced stress evolution of an ...

2020-6-17 · Datong mining area exhibits typical geological conditions: hard roof, hard coal, hard floor, large mining height (14.88 m), and high mining speed (5‐8 m/day). A hard roof results in an intensive mining condition. Under the mining effects of a strong disturbance, the loading rate increases with rapid mining, thereby causing dynamic disasters.

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Coal Mine Underground Horizontal Extension Transfer ...

At present, many coal mines in underground coal loading method are: first we will fill with the first tramcar, and then push the tramcar to another one. Finally, the electric locomotive will take all tramcar away. This method has brought many problems: the demand of roadway widened, the transmission efficiency is low, the transmission of high cost, labor intensive.

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