A model for hydrodynamic influence on a multi-layer deformable coal seam

Наседкина, А. А.; Наседкин, А. В.; Iovane, Gerardo

doi:10.1007/s00466-007-0194-6

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…However, when the distance between the UCS and LCS gradually decreases, mining of the UCS and LCS affects more and more on each other. Especially when the distance between the UCS and LCS is small, then these coal seams can be considered as CCSs, and the mining of the UCS will cause different levels of damages to the roof of the LCS, which is the floor of the UCS (Nasedkina et al., 2008; Tan et al., 2010). Also, stress can easily concentrate in the remaining protective coal pillar (RPCP) after the mining of the UCS (Singh et al., 2002; Zhang et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Zhang

et al. 2017

Energy Exploration & Exploitation

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The primary problem needed to be solved in mining close coal seams is to understand quantitatively the floor failure depth of the upper coal seam. In this study, according to the mining and geological conditions of close coal seams (#10 and #11 coal seams) in the Second Mining Zone of Caocun Coal Mine, the mechanical model of floor failure of the upper coal seam was built. Calculation results show that the advanced abutment pressure caused by the mining of the upper coal seam, resulted in the floor failure depth with a maximum of 26.1 m, which is 2.8 times of the distance between two coal seams. On this basis, the mechanical model of the remaining protective coal pillar was established and the stress distribution status under the remaining protective coal pillar in the 10# coal seam was then theoretically analysed. Analysis results show that stress distribution under the remaining protective coal pillar was significantly heterogeneous. It was also determined that the interior staggering distance should be at least 4.6 m to arrange the gateways of the #209 island coalface in the lower coal seam. Taken into account a certain safety coefficient (1.6-1.7), as well as reducing the loss of coal resources, the reasonable interior staggering distance was finally determined as 7.5 m. Finally, a novel method using radon was initially proposed to detect the floor failure depth of the upper coal seam in mining close coal seams, which could overcome deficiencies of current research methods.

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Section: Introductionmentioning

confidence: 99%

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Zhang

et al. 2017

Energy Exploration & Exploitation

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“…The former is more serious than the latter. Failure behavior breaks the integrity of interlayer rock mass and changes with the redistributed stress [19,20]. It indicates that numerical results are well coincident with the field experiment results.…”

Section: Failure State Of Interlayer Rock Massmentioning

confidence: 60%

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Zhang¹,

Shimada²,

Sasaoka³

et al. 2013

IJG

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To explore the impact of lateral stress concentration in interlayer rock stratum on the exploitation of protected coal seam, a field experiment was carried out in a multi-seam mining structure. Lateral stress redistribution and interlayer rock failure behavior were surveyed. Then an assistant numerical investigation was implemented to evolve the effect of liberated seam mining and its influence on stress reconstruction in surrounding rock mass. The cause of lateral stress concentration and its impact were discussed finally. Key findings turn out that a certain lateral stress increases in interlayer rock stratum and concentrates on its lower region. Lateral stress concentration and interlayer rock failure are interactional. The former is an inducing factor of the latter; the latter promotes the increase of concentration degree. Extent of lateral stress concentration increases to the maximum as seam distance is about 50 m. But the efficacy of liberated seam mining decreases as the seam spacing gets larger. Protected seam mining is then classified based upon the impact of lateral stress concentration, which helps to prevent the rock burst hazard and then to achieve a reliable mining in deep mines.

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“…The latter may reduce the occurrence of dynamic disasters, such as rock bursts and coal and gas outbursts [1][2][3][4][5]. However, for closely spaced coal seams (such as the bifurcation of coal), the stope stress distribution and rock stratum movement law may become more complex under the mutual disturbance of multiseam coal mining [6][7][8][9][10][11][12][13]. In addition, unreasonable mining layouts, such as residual coal pillars in goaf, are frequently more likely to cause local stress concentration and induce coal and rock dynamic disasters [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Case Study regarding the Stress Distribution and Microseismic Laws of Coal and Rock Underlying the Residual Coal Pillar

Liu

Zhang³

et al. 2022

Lithosphere

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The stress distribution characteristics, stress gradient evolution, and focal mechanism of microseism (MS) events during mining of working face 103_ (lower) 07 under an overlying residual coal pillar were investigated. Numerical simulations and MS observations were utilized. The coupling relationship between the stress gradient and MS activity was also analysed, which indicated the correlation between the fracture of coal/rock and stress gradient. In addition, the secondary disturbance of the coal mining underlying a fractured hard-thick roof is discussed. The following four points were addressed: (1) the high stress initially concentrated under the edge of the overlying residual coal pillar, and its contribution to both the local coal and rock fracture and the significant change in the stress gradient; (2) the deformation and fracture first occurred in coal and rock underlying the edge of the residual pillar. The stress concentration gradually transferred to the interior of the pillars and was accompanied by the failure of coal and rock; (3) a high correlation between the deformation and fracture of coal/rock and the stress gradient was observed. The fractures under the pillars principally appeared in the high-stress gradient area; (4) the disturbance caused by mining of the underlying working face may cause instability of the high-level fractured roof, accompanied by high-energy MS.

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A model for hydrodynamic influence on a multi-layer deformable coal seam

Cited by 11 publications

References 16 publications

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Case Study regarding the Stress Distribution and Microseismic Laws of Coal and Rock Underlying the Residual Coal Pillar

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