Numerical investigation of the effects of coal seam dip angle on coal wall stability

Yao, Qiangling; Li, Xuehua; Sun, Boyang; Ju, Minghe; Tian, Chen; Zhou, Jian; Liang, Shun; Qu, Qundi

doi:10.1016/j.ijrmms.2017.10.002

Cited by 50 publications

(35 citation statements)

References 11 publications

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“…Moreover, the rib spalling in the SDCS has multiple localized and alternating evolutions. The middle of the working face tends to be a high-incidence area of the rib spalling, which is consistent with the asymmetric loading of the surrounding rock of the stope Yao et al, 2017;Zhang and Wu, 2019). The anti-overturning and anti-skid of the support in the SDCS are its main technical challenges during ground pressure control.…”

Section: Introductionsupporting

confidence: 68%

Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

Chi

Yang

2019

Energy Exploration & Exploitation

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Roof regeneration in coal mining occurs when the remaining bottom slice of thick coal is re-mined. In view of the challenges of roof fall and instability support of a regenerative roof in the mining of steeply dipping coal seams, combined with the geological and engineering conditions of the working face in the Panbei Coal Mine, the mechanism of the instability of the regenerative roof and support is studied, and control countermeasures are proposed. Based on the comprehensive combination of the measurement of the roof structure, physical simulation, numerical simulation, and theoretical analysis, the cementation and compaction degree of the regenerated roof were described. The caving and sliding law of the regenerated roof after bottom slice mining was explored, and the model of support dumping and sliding instability under the roof fall state was established. The results obtained yielded three main findings. Firstly, the compaction degree of the regenerative roof is higher than that of the middle part of the working face, and the compaction degree of the upper part of the working face is the smallest. Secondly, the overburden structure instability of the bottom slice underwent six stages. The fracture of the cantilever beam and the slippage of gangue are the reasons for the enhancement of the acoustic signal at each stage. Finally, the upper part of the stope was identified as the crucial zone in the prevention and control of the support instability. A moving method of metal mesh with pressure and roof scraping was developed, and the support anti-overturning and anti-skid jack was set up to effectively control the stability of the support and roof fall, for safe and efficient mining of a steeply dipping coal seam under a regenerative roof.

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Section: Introductionsupporting

confidence: 68%

Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

Chi

Yang

2019

Energy Exploration & Exploitation

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“…The generalized Hoek‐Brown criterion was used by the rock mass . The Mohr‐Coulomb strain softening model was used by the coal mass . The horizontal displacement was restrained by the right and left side of the model, and the vertical displacement was restrained by the bottom of the model.…”

Section: The Surrounding Rock Failure Characteristics During the Excamentioning

confidence: 99%

“…27 The Mohr-Coulomb strain softening model was used by the coal mass. 28 The horizontal displacement was restrained by the right and left side of the model, and the vertical displacement was restrained by the bottom of the model. A 12.5 MPa uniform loading was applied on the top to replace the weight of the overlying 500 m rock strata.…”

Section: Strain Softening Model Of the Coal Massmentioning

confidence: 99%

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Tai

Xia

Kuang

2019

Energy Science & Engineering

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The coal production exploited from extra‐thick coal seams accounts for 45% of China's total coal production. With large coal output, the extra‐thick coal seams require that the chamber section be more than 100 m2. In case of parting (the noncoal rock, usually mudstone, sandwiched in the coal seam) in the extra‐thick coal seams, the integrity of the coal seams will be damaged and the large‐section chamber is extremely easy to occur rib spalling and roof leakage, which will increase the chamber's supporting difficulty. To solve such problems, this paper took the electromechanical chamber in Tashan Coal Mine as the engineering background and analyzed the deformation and failure characteristics of this chamber surrounding rocks by the numerical simulation method during the excavation process. The results indicated that the failure areas of surrounding rocks were mainly in partings, chamber ribs, and chamber dome with the failure depths of 15 m, 10 m, and 5 m, respectively. Based on the obtained deformation and failure characteristics, the supporting method of grouting integrated with high‐strength bolts and anchor cables was put forward. The grouting method was firstly used to improve the integrity of the chamber surrounding rocks, and the high‐strength bolts and anchor cables were used for supporting. Then, the supporting parameters of the bolts and anchor cables and the grouting parameters were optimized by the numerical simulation method. The optimized parameters were applied in the electromechanical chamber in Tashan Coal Mine, and the on‐site chamber ribs lateral displacement and roof separation amounts were only 0.018 m and 0.012 m, respectively, indicating that the surrounding rocks were controlled effectively.

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“…The W-shaped steel strip and the metal mesh are equivalent to the structural beam elements in the numerical simulation. 27 The finite element software provides many beam elements, and the standard beam element can simulate shear and tensile effects. The specific mechanical parameters of bolt, anchor cable and W-shaped steel belt, and metal mesh are shown in Table 4.…”

Section: Calculation Of Support Parametersmentioning

confidence: 99%

Failure mechanism of the large‐section roadway under mined zones in the ultra‐thick coal seam and its control technology

Tai

Xia

Meng

et al. 2019

Energy Science & Engineering

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Aiming at serious deformation and failure of large‐section coal roadway under mined zones in ultra‐thick coal seam, its deformation and failure characteristics are analyzed based on the field measurement. This paper reveals the mechanism of roadway roof separation, roof leakage, and right rib extrusion. Based on the mechanism, two kinds of secondary support schemes are proposed, that is, “grouting + I‐steel support + bolt” (scheme I) and “grouting + U steel support + anchor + anchor cable” (scheme II). The industrial experiment is carried out at 1070 auxiliary transportation roadway in Tashan Coal Mine. The measured results show that the roadway roof separations of the secondary support scheme I and II are only 1/11 and 1/46 of the original support scheme, respectively, while the lateral displacements of the roadway are only 1/7 and 1/44 of the original support scheme. It could be seen that the deformation and failure of the roadway surrounding rock have been well controlled.

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Numerical investigation of the effects of coal seam dip angle on coal wall stability

Cited by 50 publications

References 11 publications

Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Failure mechanism of the large‐section roadway under mined zones in the ultra‐thick coal seam and its control technology

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