Numerical Modeling and Onsite Detection Analysis of Upward Mining Feasibility of Residual Coal from Multi-Gobs in Close-Multiple Coal Seams

Yang, Li; Ren, Yuqi; Lei, Xinghai; Wang, Nan; Jin, Xiangyang

doi:10.1007/s42461-023-00796-0

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…[10][11][12][13][14][15][16] However, there is little or no research on the geological conditions of the upper and lower coal seams which are very close to each other. In this paper, the study of the upper and lower coal seam is 1 or 0 m spacing, the mining characteristics of double gobs, this study fills the previous study [17][18][19][20][21][22] of very close coal seams mining. At present, a large number of scholars [10][11][12][13][14][15][16][17][18][19][20][21][22] have focused on two main aspects in the support of lower coal roadway under close coal seams.…”

Section: Introductionsupporting

confidence: 68%

“…In this paper, the study of the upper and lower coal seam is 1 or 0 m spacing, the mining characteristics of double gobs, this study fills the previous study [17][18][19][20][21][22] of very close coal seams mining. At present, a large number of scholars [10][11][12][13][14][15][16][17][18][19][20][21][22] have focused on two main aspects in the support of lower coal roadway under close coal seams. On the one hand, it concentrates on the location of the lower coal roadway arrangement, and the roadway of the lower coal seam tries to avoid the stress concentration area of the coal pillar as much as possible, and it is applied more on the horizontal misalignment.…”

Section: Introductionsupporting

confidence: 68%

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Coupling support technique for coal roadway under double gobs in close coal seams

Wu,

Nan,

Chen

et al. 2024

Energy Science & Engineering

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In the process of lower coal roadway support under double gobs in close coal seams, there are problems such as the whole destruction of the lower coal seam and the intermediate strata, the thin roof of the lower coal roadway with the smaller support space, the upper rock of the lower coal roadway without anchor bearing layer, the roof falling, the anchor cable offing, and so on. On the basis of the engineering background of No. 11103 haulage roadway in Fenxi coal mine, the research methods of theoretical modeling analysis, numerical simulation analysis and field engineering test are comprehensively adopted. In this paper, the layout of the roadway with floor insertion in the lower coal seam, the distribution characteristics of surrounding rock deviatoric stress, the control principle of broken surrounding rock and the coupling support method of shed–cable–prop are systematically studied. The study shows that many measures are needed to ensure the stability of the surrounding rock in the strong mining roadway of the lower coal seam. The lower coal seam roadway section was modified from the original rectangular section to adopt an arched section to counteract the broken roof. The staggered position of the lower coal seam roadway layout was modified from the original coal roadway position to a coal–rock roadway, so as to avoid the area of high deviatoric stress in the coal pillar and the area of crushed coal body, and to leave an effective support space for the roof. The support scheme of the lower coal seam roadway was improved to use anchor cable and single prop to support the weak section of U‐type steel shed with local coupling, and realize unequal force coupling by adjusting the size of the force at different coupling points. In the field monitoring the deformation of the roadway is small, and the support effect is good.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionsupporting

confidence: 68%

Coupling support technique for coal roadway under double gobs in close coal seams

Wu,

Nan,

Chen

et al. 2024

Energy Science & Engineering

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Evaluation and Comparison of Rock Bolting Versus Steel Arch Support Systems in Thick Coal Seam Underground Galleries: A Case Study

Mesutoglu,

Ozkan

2024

Mining, Metallurgy & Exploration

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This study investigates the feasibility of rock bolting support in an underground coal mine gallery with a thick coal seam. The Ömerler underground coal mine working area, owned by the West Lignite Enterprise (GLI) of the Turkish Coal Enterprises (TKI), was selected for this purpose. Longwall top coal caving (LTCC) is implemented as the production method in the Ömerler underground coal mine. Field and laboratory studies were conducted to determine rock mass and rock material properties, followed by experimental, empirical, and numerical analyses based on the acquired data. The obtained design results were evaluated using a resin-grouted rebar (RBR) rock bolting system and steel arch support (SAS) pilot application areas. The numerical modeling results conducted using the Fast Lagrangian Analysis of Continua 3D (FLAC 3D) (v6.0) program indicated less displacement and secondary stress change in the RBR-supported zone compared to the SAS-supported zone. In situ measurements also demonstrated that RBR provided more successful support to the roof during coal production activities. The findings suggest that RBR is a more effective solution when evaluating the feasibility of rock bolting support systems in underground galleries with thick coal seams at the Ömerler underground coal mine. This study emphasizes the importance of more sustainable and safe support systems to enhance operational efficiency in the coal mining industry.

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Reasonable layout range of lower mining roadways in the close and variable interval coal seams mining: a case study

Wang,

Yang,

Wang

et al. 2024

Sci Rep

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In the context of close-distance coal seam mining, the stress transfer mechanism following the extraction of the upper coal seam is crucial for the layout of roadways in the lower coal seam. This study utilizes ground-penetrating radar (GPR) to analyze the stability and plastic zone extent of residual coal pillars after upper seam extraction. A theoretical model for the stress distribution of multiple goaves and coal pillars was established. Based on a case study with variable inter-seam spacing, the stress distribution and transfer mechanisms of the floor were analyzed. The results indicate that during the transition from the center of the coal pillar to the goaf, stress concentration initially decreases significantly and then gradually returns to the original rock stress, forming a distinct stress gradient distribution. As the depth of the floor strata increases, the weight of the overlying strata is more evidently transferred through the coal pillars to the goaf. Finally, a reasonable layout range for the lower seam mining roadways under different inter-seam spacings is proposed, providing a reference for optimizing roadway layout in similar geological conditions.

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Numerical Modeling and Onsite Detection Analysis of Upward Mining Feasibility of Residual Coal from Multi-Gobs in Close-Multiple Coal Seams

Cited by 3 publications

References 35 publications

Coupling support technique for coal roadway under double gobs in close coal seams

Coupling support technique for coal roadway under double gobs in close coal seams

Evaluation and Comparison of Rock Bolting Versus Steel Arch Support Systems in Thick Coal Seam Underground Galleries: A Case Study

Reasonable layout range of lower mining roadways in the close and variable interval coal seams mining: a case study

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