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Deformation Failure Characteristics of Coal Body .Traduire cette page

The results provide theory reference for the research on the range of mining-induced stress and broken coal wall. 1. Introduction. With the deterioration of occurrence condition of coal resources, mechanical environment for coal mining, organization structure of coal and rock mass, its mechanical behavior and failure characteristics become complicated, so the characteristics of engineering ...

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Coal Burst Induced by Horizontal Section Mining .Traduire cette page

3. Mechanism of Coal Bursts Induced by Horizontal Section Mining of SICSs 3.1. Superposition of Dynamic and Static Loads. A number of studies and field cases have shown that coal bursts are induced by tremors under concentrated stress, i.e., coal bursts induced by dynamic combined with static loads.

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Mining Induced Seismicity | SpringerLinkTraduire cette page

One or combination of the above factors may contribute significantly to mining seismcity in any specific case (Gibowicz and Kijko, 1994; Mendecki, 1997; Holub, 1997; Holub et. al., 1995)). It is often observed that most of the damaging events, commonly known as rockbursts, are induced at the geological discontinuity in the mining area, Figure 5 ...

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Coal mine subsidence—western United States | .

Coal mine subsidence is the local lowering of the ground surface caused by coal mining. Subsidence processes above underground mines consist of a gradual downwarping of the overburden into coal extraction panels, which causes depressions, or a sudden collapse into individual mine openings, which causes pits. Subsidence type (depressions, pits), amount, areal extent, rate, and duration are ...

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Deformation Failure Characteristics of Coal Body .Traduire cette page

The results provide theory reference for the research on the range of mining-induced stress and broken coal wall. 1. Introduction. With the deterioration of occurrence condition of coal resources, mechanical environment for coal mining, organization structure of coal and rock mass, its mechanical behavior and failure characteristics become complicated, so the characteristics of engineering ...

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Seismicity induced by longwall coal mining at the .Traduire cette page

The United Kingdom has a long history of deep coal mining, and numerous cases of mining-induced seismicity have been recorded over the past 50 yr. In this study, we examine seismicity induced by longwall mining at one of the United Kingdom's last deep coal mines, the Thoresby Colliery, Nottinghamshire. After public reports of felt seismicity in late 2013 a local seismic monitoring network ...

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Three-dimensional time-varying large surface .Traduire cette page

01/04/2020 · Due to the complexity of mining geology and its three-dimensional (3D) nature, previous studies on coal-mining-induced subsidence are primarily based on ground measurements in the field. Traditional monitoring techniques of coal mining subsidence mainly consist of .

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Numerical modelling of microseismicity associated .Traduire cette page

01/06/2018 · In contrast, microseismic events induced from longwall coal mining can occur up to 100 m ahead of a working face. Jackson (1984) reported that the majority of microseismic activities are located at a distance 10–80 m ahead of longwall faces, and yet little activity was detected in close proximity of the faces in Polish collieries.

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Coal mining - Wikipedia

Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is a 'pit', and ...

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A review of coal mining induced fault reactivation .Traduire cette page

In some circumstances, such as minewater rebound or residual mining subsidence, further movements along a previously reactivated fault are possible. The objectives of this paper are to provide, for the first time, a comprehensive account of reported and recorded cases of mining-induced fault reactivation in Britain. These have been compiled ...

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New Method to Design Coal Pillar for Lateral Roof .Traduire cette page

Mining-induced stress contour presents a concave-upward type from coal seam to the overlying strata that cannot be merged into a straight one due to their different characteristics of movement and deformation. With this in mind, this study proposed a method to design the width of coal pillar for lateral roof roadway according to the mining-induced stress contour. According to mining-induced ...

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Rapid decompression and desorption induced energetic ... · Fichier PDF

outburst and represents a major coal mining hazard. T D ACCEPTED MANUSCRIPT Rapid decompression and desorption induced energetic failure in coal Shugang Wang a, *, Derek Elsworth a, Jishan Liu b a Department of Energy and Mineral Engineering, EMS Energy Institute and G 3 Center, Pennsylvania State University, University Park, PA, USA b School of Mechanical and Chemical .

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Numerical analysis and prediction of ground surface ...Traduire cette page

25/07/2020 · Ground surface movement shows different features during mining and post-mining period. If the mine goaf is dry, surface subsidence is observed in both.

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Floor failure and roadway deformation induced .

Mining-induced floor failure of contiguous coal seams, numbered 1#, 3#, 5#, 7#, and 12#, is studied by theoretical calculation and numerical simulation based on the geological conditions at Huopu Mine. The results indicate that pressure relief failure of the floor in the mining of contiguous coal seams is notably different from that in the mining of a single coal seam.

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link.springerTraduire cette page

The accuracy of using these seismic parameters for the prediction of HE events has been assessed based on the seismic data collected from a Chinese coal mine. Mining-induced seismicity has been reported almost in every mining country. Large seismic events with high-energy (HE) radiation can pose a .

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Acoustic Emission Characteristics of Coal Samples .Traduire cette page

Research on the mining-induced mechanical behavior and microcrack evolution of deep-mined coal has become increasingly important with the sharp increase in mining depth. For rock units in front of the working face, the microcrack evolution characteristics, structural characteristics, and stress state correspond well to mining layouts and depths under deep mining.

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Study on Roof Breakage-Induced Roadway Coal .

In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the breakage of a thick hard roof. The aim of this research is to study failure laws of SICS roadways under the superposition of dynamic load ...

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Automated full moment tensor inversion of coal .Traduire cette page

30/08/2013 · Seismicity induced by coal mining in the Ruhr region, Germany, has been monitored continuously over the last 25 yr. In 2006, a dense temporary network (HAMNET) was deployed to locally monitor seismicity induced by longwall mining close to the town of Hamm.

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Assessing risks from mining-induced ground .Traduire cette page

01/01/2020 · Hundreds of planned and actively producing wells penetrate protective coal pillars or barriers within active mine boundaries, including chain pillars located between longwall panels. Gas released from a well damaged by mining-induced ground movements could pose a risk to miners by flowing into the mine atmosphere.

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Numerical Modelling Of Mining Induced Subsidence

2006 Coal Operators' Conference The AusIMM Illawarra Branch 6 – 7 July 2006 313 NUMERICAL MODELLING OF MINING INDUCED SUBSIDENCE Walter Keilich 1, Ross Seedsman 2, and Naj Aziz 1 ABSTRACT: A methodology of subsidence prediction using the Distinct Element code UDEC has been developed as an alternative for subsidence modelling in the Southern Coalfield, New South Wales, .

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