Investigation of the efficiency of longwall top coal caving method applied by forming a face in horizontal thickness of the seam in steeply inclined thick coal seams by using a physical model

Çelik, Arif; Özçelik, Yılmaz

doi:10.1016/j.ijrmms.2021.104917

Cited by 22 publications

(5 citation statements)

References 28 publications

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“…In recent years, the implementation of mechanized excavation systems, particularly in the longwall mining method within underground coal mines, has facilitated high-tonnage coal production [5,6,7]. The Longwall Top Coal Caving (LTCC) method, one of the longwall mining techniques, has been specifically developed for underground coal mining, enabling the effective and efficient extraction of thick coal seams [8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Determination by Numerical Modeling of Stress-Strain Variations Resulting From Gallery Cross-Section Changes in a Longwall Top Coal Caving Panel

MESUTOĞLU,

ÖZKAN,

RODRIGUEZ DONO

2024

KONJES

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As a major pillar of global energy production, coal mining requires continuous advancements in efficiency to contribute to the broader goal of energy sustainability, all the while the shift towards more sustainable energy sources is underway. Mechanized excavation systems employed in underground coal mines, particularly within the longwall mining method, enable high-tonnage coal production. The Longwall Top Coal Caving (LTCC) method, one of the longwall mining techniques, has been developed for the effective extraction of coal from thick coal seams. However, as mining operations delve deeper, various complex issues, such as gallery cross-sectional variation, emerge. Gallery cross-sectional variation can increase the risk of collapse by affecting the stress distribution in the rock mass, posing a threat to worker safety. This study centers on the numerical modeling and analysis of gallery cross-sectional variation in the Ömerler underground mine, operated by the Turkish Coal Enterprises (TKI), West Lignite Enterprise (GLI). To achieve this objective, an extensive database was established through field and laboratory rock mechanics studies. This database was then utilized in the Fast Lagrangian Analysis of Continua 3D (FLAC3D) (v6.0) program to simulate the cross-sectional variations of the A6 panel in the Ömerler underground mine. The numerical simulation results provide valuable insights into the secondary stress-deformation changes associated with gallery cross-sectional variation.

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Section: Introductionmentioning

confidence: 99%

Determination by Numerical Modeling of Stress-Strain Variations Resulting From Gallery Cross-Section Changes in a Longwall Top Coal Caving Panel

MESUTOĞLU,

ÖZKAN,

RODRIGUEZ DONO

2024

KONJES

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“…For the bottom maintaining coal roadway, the method of slicing mining is adopted to avoid the problem of difficult support of the roadway surrounding rock [2,3], which has a long recovery period, high mining cost, and serious floor heave problems [4,5]. For the top coal roadway, the coal was initially mined using the common fully mechanized caving mining method, and a pillar of more than ten meters or even dozens of meters was left between the working faces to resist the impact of mining [6,7], which caused a large waste of coal resources [8][9][10]. After continuous efforts and attempts by scholars, the width of the pillar was continuously improved under the premise of ensuring mining safety and was supplemented with corresponding support means [11][12][13], and small pillar mining was successfully tested and gradually promoted [14,15].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of Roof-Cutting Parameters on the Stability of Top Coal Gob-Side Entry Retaining by Roof Pre-Fracturing in Ultra-Thick Coal Seam

et al. 2023

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Gob-side entry retaining by roof cutting, a pillarless mining technique, plays a critical role in maintaining continuous production, rapid connection, and enhancing the coal recovery rate in fully mechanized top coal caving working faces. This technique stands as a sustainable development method in coal mining. The present research, set against the backdrop of the Yitang Coal Mine 100602 top coal gob-side entry retaining by roof cutting, investigates the influence of roof-cutting borehole depth, borehole dip angle, mining height, and coal seam thickness on stability in an ultra-thick coal seam under 12 distinct mining conditions. A typical model of overburden structure post-roof pre-splitting was established to study the failure mechanism of the top coal roof. The results reveal that the dip angle and depth of the roof pre-fracturing borehole significantly impact the movement characteristics of the overlying strata. Optimal conditions are found when the dip angle and depth of the roof pre-fracturing borehole, the mining height, and the top coal thickness are 10°, 16 m, 4 m, and 4 m, respectively. Under these circumstances, the load transfer from the goaf to the gob-side entry can be effectively intercepted, mitigating the influence of roof fracture activities on the top coal gob-side entry. Field measurements confirm that suitable anchor-net support can stabilize the roof’s rock structure. This research underpins the significance of roof pre-fracturing for the promotion and application of top coal gob-side entry retaining by roof cutting in ultra-thick coal seams.

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“…For a period of time, coal will still be the main support of China's energy. China's 6 ~20 m and above ultrathick coal seam reserves are rich, is the main coal seam of billion tons of large coal base, its resource reserves accounted for 45% ~50% of China's total coal resources [6][7][8][9]. China's extrathick coal seams are widely distributed in Shaanxi, Shanxi, Xinjiang, Inner Mongolia, and other regions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

et al. 2022

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In order to study the migration characteristics and strata behavior law of mining-induced rocks in fully mechanized caving face of coal mine, taking the actual geological mining of Longwanggou Coal Mine as the background, using computer software (KSPB) to identify the location of key strata. The physical similar material simulation test was used to monitor the movement characteristics of mining-induced rocks by using the internal displacement sensor (IDS) and distributed optical fiber sensor (DOFS). A three-dimensional physical model of 3.6 m × 2.0 m × 2.0 m was built; the internal displacement of rock was measured by IDS. BOTDA distributed optical fiber was used to monitor the dynamic movement and deformation law of coated rock. Finally, the two monitoring results were compared and analyzed. The results show that: (1) the displacement curve of the fractured rock mass in the key strata shows a “stepped” increase; (2) based on the analysis of displacement continuous monitoring results, the strata behavior law of working face is obtained. The first weighting interval of 61601 working face is 90 cm, and the periodic weighting steps are 105 cm, 115 cm, 135 cm, 150 cm, 165 cm, 180 cm, 215 cm, and 240 cm; (3) the average strain of fiber is proposed. The first weighting and periodic weighting laws of the working face are represented by the average strain, which are consistent with the experimental phenomena. The first weighting in the average strain curve shows the first mutation peak, and the periodic weighting shows the periodic mutation peak change of the average strain curve.

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Investigation of the efficiency of longwall top coal caving method applied by forming a face in horizontal thickness of the seam in steeply inclined thick coal seams by using a physical model

Cited by 22 publications

References 28 publications

Determination by Numerical Modeling of Stress-Strain Variations Resulting From Gallery Cross-Section Changes in a Longwall Top Coal Caving Panel

Determination by Numerical Modeling of Stress-Strain Variations Resulting From Gallery Cross-Section Changes in a Longwall Top Coal Caving Panel

Numerical Investigation of the Influence of Roof-Cutting Parameters on the Stability of Top Coal Gob-Side Entry Retaining by Roof Pre-Fracturing in Ultra-Thick Coal Seam

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

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