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The influence of advance speed on overburden movement characteristics in longwall coal mining: insig...

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Journal Title: Journal of Geophysics and Engineering
Authors and Corporations: Han, Penghua, Zhang, Cun, Ren, Zhaopeng, He, Xiang, Jia, Sheng
In: Journal of Geophysics and Engineering, 18, 2021, 1, p. 163-176
Media Type: E-Article
Language: English
published:
Oxford University Press (OUP)
Subjects:
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rft.atitle The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
rft.epage 176
rft.genre article
rft.issn 1742-2132
1742-2140
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rft.jtitle Journal of Geophysics and Engineering
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rft.pub Oxford University Press (OUP)
rft.date 2021-02-15
x.date 2021-02-15T00:00:00Z
rft.spage 163
rft.volume 18
abstract <jats:title>Abstract</jats:title> <jats:p>The advance speed of a longwall face is an essential factor affecting the mining pressure and overburden movement, and an effective approach for choosing a reasonable advance speed to realise coal mine safety and efficient production is needed. To clarify the influence of advance speed on the overburden movement law of a fully mechanised longwall face, a time-space subsidence model of overburden movement is established by the continuous medium analysis method. The movement law of overburden in terms of the advance speed is obtained, and mining stress characteristics at different advance speeds are reasonably explained. The theoretical results of this model are further verified by a physical simulation experiment. The results support the following conclusions. (i) With increasing advance speed of the longwall face, the first (periodic) rupture interval of the main roof and the key stratum increase, while the subsidence of the roof, the fracture angle and the rotation angle of the roof decrease. (ii) With increasing advance speed, the roof displacement range decreases gradually, and the influence range of the advance speed on the roof subsidence is 75 m behind the longwall face. (iii) An increase in the advance speed of the longwall face from 4.89 to 15.23 m/d (daily advancing of the longwall face) results in a 3.28% increase in the impact load caused by the sliding instability of the fractured rock of the main roof and a 5.79% decrease in the additional load caused by the rotation of the main roof, ultimately resulting in a 9.63% increase in the average dynamic load coefficient of the support. The roof subsidence model based on advance speed is proposed to provide theoretical support for rational mining design and mining-pressure-control early warning for a fully mechanised longwall face.</jats:p>
authors Array ( [rft.aulast] => Han [rft.aufirst] => Penghua )
Array ( [rft.aulast] => Zhang [rft.aufirst] => Cun )
Array ( [rft.aulast] => Ren [rft.aufirst] => Zhaopeng )
Array ( [rft.aulast] => He [rft.aufirst] => Xiang )
Array ( [rft.aulast] => Jia [rft.aufirst] => Sheng )
doi 10.1093/jge/gxab005
languages eng
url http://dx.doi.org/10.1093/jge/gxab005
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author Han, Penghua, Zhang, Cun, Ren, Zhaopeng, He, Xiang, Jia, Sheng
author_facet Han, Penghua, Zhang, Cun, Ren, Zhaopeng, He, Xiang, Jia, Sheng, Han, Penghua, Zhang, Cun, Ren, Zhaopeng, He, Xiang, Jia, Sheng
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container_title Journal of Geophysics and Engineering
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description <jats:title>Abstract</jats:title> <jats:p>The advance speed of a longwall face is an essential factor affecting the mining pressure and overburden movement, and an effective approach for choosing a reasonable advance speed to realise coal mine safety and efficient production is needed. To clarify the influence of advance speed on the overburden movement law of a fully mechanised longwall face, a time-space subsidence model of overburden movement is established by the continuous medium analysis method. The movement law of overburden in terms of the advance speed is obtained, and mining stress characteristics at different advance speeds are reasonably explained. The theoretical results of this model are further verified by a physical simulation experiment. The results support the following conclusions. (i) With increasing advance speed of the longwall face, the first (periodic) rupture interval of the main roof and the key stratum increase, while the subsidence of the roof, the fracture angle and the rotation angle of the roof decrease. (ii) With increasing advance speed, the roof displacement range decreases gradually, and the influence range of the advance speed on the roof subsidence is 75 m behind the longwall face. (iii) An increase in the advance speed of the longwall face from 4.89 to 15.23 m/d (daily advancing of the longwall face) results in a 3.28% increase in the impact load caused by the sliding instability of the fractured rock of the main roof and a 5.79% decrease in the additional load caused by the rotation of the main roof, ultimately resulting in a 9.63% increase in the average dynamic load coefficient of the support. The roof subsidence model based on advance speed is proposed to provide theoretical support for rational mining design and mining-pressure-control early warning for a fully mechanised longwall face.</jats:p>
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spelling Han, Penghua Zhang, Cun Ren, Zhaopeng He, Xiang Jia, Sheng 1742-2132 1742-2140 Oxford University Press (OUP) Management, Monitoring, Policy and Law Industrial and Manufacturing Engineering Geology Geophysics http://dx.doi.org/10.1093/jge/gxab005 <jats:title>Abstract</jats:title> <jats:p>The advance speed of a longwall face is an essential factor affecting the mining pressure and overburden movement, and an effective approach for choosing a reasonable advance speed to realise coal mine safety and efficient production is needed. To clarify the influence of advance speed on the overburden movement law of a fully mechanised longwall face, a time-space subsidence model of overburden movement is established by the continuous medium analysis method. The movement law of overburden in terms of the advance speed is obtained, and mining stress characteristics at different advance speeds are reasonably explained. The theoretical results of this model are further verified by a physical simulation experiment. The results support the following conclusions. (i) With increasing advance speed of the longwall face, the first (periodic) rupture interval of the main roof and the key stratum increase, while the subsidence of the roof, the fracture angle and the rotation angle of the roof decrease. (ii) With increasing advance speed, the roof displacement range decreases gradually, and the influence range of the advance speed on the roof subsidence is 75 m behind the longwall face. (iii) An increase in the advance speed of the longwall face from 4.89 to 15.23 m/d (daily advancing of the longwall face) results in a 3.28% increase in the impact load caused by the sliding instability of the fractured rock of the main roof and a 5.79% decrease in the additional load caused by the rotation of the main roof, ultimately resulting in a 9.63% increase in the average dynamic load coefficient of the support. The roof subsidence model based on advance speed is proposed to provide theoretical support for rational mining design and mining-pressure-control early warning for a fully mechanised longwall face.</jats:p> The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation Journal of Geophysics and Engineering
spellingShingle Han, Penghua, Zhang, Cun, Ren, Zhaopeng, He, Xiang, Jia, Sheng, Journal of Geophysics and Engineering, The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation, Management, Monitoring, Policy and Law, Industrial and Manufacturing Engineering, Geology, Geophysics
title The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
title_full The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
title_fullStr The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
title_full_unstemmed The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
title_short The influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
title_sort the influence of advance speed on overburden movement characteristics in longwall coal mining: insight from theoretical analysis and physical simulation
topic Management, Monitoring, Policy and Law, Industrial and Manufacturing Engineering, Geology, Geophysics
url http://dx.doi.org/10.1093/jge/gxab005