LAPSE:2019.0438
Published Article
LAPSE:2019.0438
Analysis on Filling Ratio and Shield Supporting Pressure for Overburden Movement Control in Coal Mining with Compacted Backfilling
Yanli Huang, Junmeng Li, Tianqi Song, Guoqiang Kong, Meng Li
March 26, 2019
Since the weight of overburden is sustained by both the backfill body and the unmined solid coal in coal mining with compacted backfilling (CMCB) panels, the stress and deformation characteristics of the surrounding rocks in coal mining are radically changed. The overburden movement control mechanism by coordinating with backfill body and shield in CMCB was studied systematically in this paper. Based on the analysis of deformational and structural characteristics of surrounding rock in CMCB panels, the methods of theoretical analysis, numerical simulation and engineering test are employed. The results show that the fracture of the main roof is mainly controlled by the filling ratio φ and is non-correlated to the shield supporting pressure p. However, p has a significant control effect on the deflection of roof within the shield canopy length, and adversely affects the filling ratio. With the increase of the filling ratio of the gob, the maximum sagging of the immediate and the main roofs, the peak front and the influence range of the abutment pressures are gradually reduced. Correspondingly, the stable period of internal pressure of backfill body in the gob is shortened. Engineering practice shows that the sagging of the gob roof, the distribution of the abutment pressure, the distribution of the internal pressure in the backfill body, and the ground surface sagging results obtained by the in-situ measurement are approximately corresponding to the theoretical analysis and numerical simulation results.
Keywords
coal mining with compacted backfilling (CMCB), elastic-thin-plate mechanical model, filling ratio, numerical simulation, overburden movement, shield supporting pressure
Suggested Citation
Huang Y, Li J, Song T, Kong G, Li M. Analysis on Filling Ratio and Shield Supporting Pressure for Overburden Movement Control in Coal Mining with Compacted Backfilling. (2019). LAPSE:2019.0438
Author Affiliations
Huang Y: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Li J: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China [ORCID]
Song T: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Kong G: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Li M: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
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Journal Name
Energies
Volume
10
Issue
1
Article Number
E31
Year
2016
Publication Date
2016-12-30
Published Version
ISSN
1996-1073
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Original Submission
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PII: en10010031, Publication Type: Journal Article
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LAPSE:2019.0438
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doi:10.3390/en10010031
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Mar 26, 2019
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Mar 26, 2019
 
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Calvin Tsay
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