Failure Mechanisms of Rheological Coal Roadway
The roadway instability in deep underground conditions has attracted constant concerns in recent years, as it seriously affects the efficiency of coal mining and the safety of personnel. The large rheological deformations normally occur in deep roadway with soft coal mass. However, the failure mecha...
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doaj-5ae20b17f4cd48658c84ac45d5e4213e2020-11-25T03:37:14ZengMDPI AGSustainability2071-10502020-04-01122885288510.3390/su12072885Failure Mechanisms of Rheological Coal RoadwayYuantian Sun0Guichen Li1Junfei Zhang2Jiahui Xu3Key Laboratory of Deep Coal Resource Mining; School of Mines; China University of Mining and Technology, Xuzhou 221116, ChinaKey Laboratory of Deep Coal Resource Mining; School of Mines; China University of Mining and Technology, Xuzhou 221116, ChinaDepartment of Civil, Environmental and Mining Engineering, the University of Western Australia, Perth 6009, AustraliaKey Laboratory of Deep Coal Resource Mining; School of Mines; China University of Mining and Technology, Xuzhou 221116, ChinaThe roadway instability in deep underground conditions has attracted constant concerns in recent years, as it seriously affects the efficiency of coal mining and the safety of personnel. The large rheological deformations normally occur in deep roadway with soft coal mass. However, the failure mechanism of such roadways is still not clear. In this study, based on a typical soft coal roadway in the field, the in-situ measurements and rock mass properties were obtained. The rheological deformation of that roadway was revealed. Then a time-dependent 3D numerical model was established and verified. Based on the verified model, the deformation properties and evolutionary failure mechanism of deep coal roadway were investigated in detail. The results showed that the deformation of the soft coal roadway demonstrated rheological behavior and the applied support structures failed completely. After roadway excavation, the maximum and minimum stresses around the roadway deteriorated gradually with the increase of time. The failure zones in soft coal mass expanded increasingly over time, which had a negative effect on roadway stability in the long-term. According to the findings, helpful suggestions were further presented to control the rheological deformation in the roadway. This research systematically reveals the instability mechanism of the deep coal roadway and provides some strategies for maintaining roadway stability, which can significantly promote the sustainability of mining in deep underground coal mines.https://www.mdpi.com/2071-1050/12/7/2885soft coalmining safetytime-dependent behaviorfailure mechanismroadway deformationnumerical modelling |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuantian Sun Guichen Li Junfei Zhang Jiahui Xu |
spellingShingle |
Yuantian Sun Guichen Li Junfei Zhang Jiahui Xu Failure Mechanisms of Rheological Coal Roadway Sustainability soft coal mining safety time-dependent behavior failure mechanism roadway deformation numerical modelling |
author_facet |
Yuantian Sun Guichen Li Junfei Zhang Jiahui Xu |
author_sort |
Yuantian Sun |
title |
Failure Mechanisms of Rheological Coal Roadway |
title_short |
Failure Mechanisms of Rheological Coal Roadway |
title_full |
Failure Mechanisms of Rheological Coal Roadway |
title_fullStr |
Failure Mechanisms of Rheological Coal Roadway |
title_full_unstemmed |
Failure Mechanisms of Rheological Coal Roadway |
title_sort |
failure mechanisms of rheological coal roadway |
publisher |
MDPI AG |
series |
Sustainability |
issn |
2071-1050 |
publishDate |
2020-04-01 |
description |
The roadway instability in deep underground conditions has attracted constant concerns in recent years, as it seriously affects the efficiency of coal mining and the safety of personnel. The large rheological deformations normally occur in deep roadway with soft coal mass. However, the failure mechanism of such roadways is still not clear. In this study, based on a typical soft coal roadway in the field, the in-situ measurements and rock mass properties were obtained. The rheological deformation of that roadway was revealed. Then a time-dependent 3D numerical model was established and verified. Based on the verified model, the deformation properties and evolutionary failure mechanism of deep coal roadway were investigated in detail. The results showed that the deformation of the soft coal roadway demonstrated rheological behavior and the applied support structures failed completely. After roadway excavation, the maximum and minimum stresses around the roadway deteriorated gradually with the increase of time. The failure zones in soft coal mass expanded increasingly over time, which had a negative effect on roadway stability in the long-term. According to the findings, helpful suggestions were further presented to control the rheological deformation in the roadway. This research systematically reveals the instability mechanism of the deep coal roadway and provides some strategies for maintaining roadway stability, which can significantly promote the sustainability of mining in deep underground coal mines. |
topic |
soft coal mining safety time-dependent behavior failure mechanism roadway deformation numerical modelling |
url |
https://www.mdpi.com/2071-1050/12/7/2885 |
work_keys_str_mv |
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