IMECH-IR  > 流固耦合系统力学重点实验室
Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method
Zhang, QL; Yue, JC; Liu, C; Feng C(冯春); Li, HM
Corresponding AuthorLi, Huamin(lihm@hpu.edu.cn)
Source PublicationINTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
2019-10-01
Volume122Pages:16
ISSN1365-1609
AbstractIn order to investigate top-coal drawing regularity and automated top-coal caving technology in extra-thick coal seams, an approach coupling the particle element and the block element is presented based on the continuum-discontinuum element method (CDEM). Then, the constitutive model of hydraulic support is introduced into the CDEM to simulate the top-coal drawing process. Meanwhile, the Bergmark-Roos model for coal drawing of single support is extended into the collaborative coal drawing of multiple supports to optimize the automated top-coal caving technology. Finally, CDEM models of hydraulic support, armored face conveyer and coal-rock strata are established according to the field conditions of the "Tongxin Coal Mine". Then, the top-coal drawing mechanism is analyzed, and an automated top-coal caving technology is proposed. The results show that under the interaction between hydraulic support and surrounding rocks, the final drawing body of initial top-coal drawing appears as an irregular, deflected ellipsoid shape. During different support-moving cycles, the coal-rock structure affects the coal drawing amount and support resistance. A statistical comparison of the coal-rock drawing amount based on 100 drawing openings indicates that the standard deviation of the coal drawing amount in automated, one-round coal caving is 1.83 m(2) less than that in traditional coal caving (8.23 m(2)), and the coal drawing amount from each drawing window is more uniform. For multi-round coal caving techniques, the average recovery rate remains at 79.4% and the rock mixed rate is less than 1%. Based on a comparison of several coal caving techniques, automated four-round coal caving technology is the optimal technology, in which the change rate of the standard deviation of the coal drawing amount as well as the top-coal recovery rate are both largest.
KeywordExtra-thick coal seam Automated top-coal caving Continuum-discontinuum element method Constitutive model of hydraulic support Bergmark-Roos model
DOI10.1016/j.ijrmms.2019.04.019
Indexed BySCI ; EI
Language英语
WOS IDWOS:000485253500013
WOS KeywordBERGMARK-ROOS ; LONGWALL ; SIMULATION ; SUBSIDENCE ; MECHANISM ; BASIN ; ANGLE ; DEM
WOS Research AreaEngineering ; Mining & Mineral Processing
WOS SubjectEngineering, Geological ; Mining & Mineral Processing
Funding ProjectNational Key R&D Program of China[2018YFC0604502] ; project of automated top-coal caving system research - Datong Coal Mine Group ; National Natural Science Foundation of China[51708513]
Funding OrganizationNational Key R&D Program of China ; project of automated top-coal caving system research - Datong Coal Mine Group ; National Natural Science Foundation of China
Classification一类
Ranking4
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/80001
Collection流固耦合系统力学重点实验室
Recommended Citation
GB/T 7714
Zhang, QL,Yue, JC,Liu, C,et al. Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2019,122:16.
APA Zhang, QL,Yue, JC,Liu, C,冯春,&Li, HM.(2019).Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,122,16.
MLA Zhang, QL,et al."Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 122(2019):16.
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