Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Abstract The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to inv...

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Main Authors: Ning Jiang, Changxiang Wang, Haiyang Pan, Dawei Yin, Junbiao Ma
Format: Article
Language:English
Published: Wiley 2020-06-01
Series:Energy Science & Engineering
Subjects:
Online Access:https://doi.org/10.1002/ese3.660
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author Ning Jiang
Changxiang Wang
Haiyang Pan
Dawei Yin
Junbiao Ma
author_facet Ning Jiang
Changxiang Wang
Haiyang Pan
Dawei Yin
Junbiao Ma
author_sort Ning Jiang
collection DOAJ
description Abstract The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to investigate the stress and surface subsidence of a filling body (or coal pillar) under two filling sequences through theoretical analysis, similar simulation tests, and numerical simulations. To achieve optimal filling materials for the Liudong Coal Mine, a low‐strength similar paste filling material composed of fly ash, gypsum, and sand was developed. The relationships between the strength and the cement ratio and between the strength and the sand‐binder ratio were discussed. Similar simulation tests showed that mining scheme 1 (mining before filling) could lead to the formation of an isolated island coal pillar in the mining process, mining scheme 2 (filling before mining) had less influence on surface subsidence, and the stress on the filling body was smaller for scheme 2 than for scheme 1. The distributions of the stress and plastic zone in the two different mining and filling sequences were obtained through numerical simulations. The method of first filling and then mining could greatly reduce the stress concentration and plastic zone during the mining process. In summary, mining scheme 2 (filling before mining) can avoid the formation of isolated island coal pillars in the process of mining, and without considering other factors, scheme 2 should be adopted as much as possible.
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spelling doaj.art-ff76fa110e984bf1a19081c3c6cb86f62022-12-22T00:25:19ZengWileyEnergy Science & Engineering2050-05052020-06-01862239225510.1002/ese3.660Modeling study on the influence of the strip filling mining sequence on mining‐induced failureNing Jiang0Changxiang Wang1Haiyang Pan2Dawei Yin3Junbiao Ma4State Key Laboratory of Mining Disaster Prevention and Control Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao ChinaState Key Laboratory of Mining Disaster Prevention and Control Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao ChinaState Key Laboratory of Mining Disaster Prevention and Control Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao ChinaState Key Laboratory of Mining Disaster Prevention and Control Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao ChinaState Key Laboratory of Mining Disaster Prevention and Control Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao ChinaAbstract The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to investigate the stress and surface subsidence of a filling body (or coal pillar) under two filling sequences through theoretical analysis, similar simulation tests, and numerical simulations. To achieve optimal filling materials for the Liudong Coal Mine, a low‐strength similar paste filling material composed of fly ash, gypsum, and sand was developed. The relationships between the strength and the cement ratio and between the strength and the sand‐binder ratio were discussed. Similar simulation tests showed that mining scheme 1 (mining before filling) could lead to the formation of an isolated island coal pillar in the mining process, mining scheme 2 (filling before mining) had less influence on surface subsidence, and the stress on the filling body was smaller for scheme 2 than for scheme 1. The distributions of the stress and plastic zone in the two different mining and filling sequences were obtained through numerical simulations. The method of first filling and then mining could greatly reduce the stress concentration and plastic zone during the mining process. In summary, mining scheme 2 (filling before mining) can avoid the formation of isolated island coal pillars in the process of mining, and without considering other factors, scheme 2 should be adopted as much as possible.https://doi.org/10.1002/ese3.6603U coal seam miningmining and filling sequenceproportioning experimentsurface subsidence
spellingShingle Ning Jiang
Changxiang Wang
Haiyang Pan
Dawei Yin
Junbiao Ma
Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
Energy Science & Engineering
3U coal seam mining
mining and filling sequence
proportioning experiment
surface subsidence
title Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
title_full Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
title_fullStr Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
title_full_unstemmed Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
title_short Modeling study on the influence of the strip filling mining sequence on mining‐induced failure
title_sort modeling study on the influence of the strip filling mining sequence on mining induced failure
topic 3U coal seam mining
mining and filling sequence
proportioning experiment
surface subsidence
url https://doi.org/10.1002/ese3.660
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AT daweiyin modelingstudyontheinfluenceofthestripfillingminingsequenceonmininginducedfailure
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