Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock

Gently inclined medium-thick orebodies are generally recognized as the most difficult type of orebody to mine, using current available strategies (i.e., the room and pillar method). In the present study, a similar physical model was used to investigate the roof stress and subsidence for mining gentl...

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Main Authors: Xiaoshuang Li, Zhifang Liu, Shun Yang
Format: Article
Language:English
Published: Hindawi Limited 2021-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2021/6686981
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spelling doaj-6b4096cf413d4ee19797d6ccb67a40052021-05-10T00:27:02ZengHindawi LimitedAdvances in Civil Engineering1687-80942021-01-01202110.1155/2021/6686981Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate RockXiaoshuang Li0Zhifang Liu1Shun Yang2School of Resources and Environmental EngineeringSchool of Resources and Environmental EngineeringSchool of Resources and Environmental EngineeringGently inclined medium-thick orebodies are generally recognized as the most difficult type of orebody to mine, using current available strategies (i.e., the room and pillar method). In the present study, a similar physical model was used to investigate the roof stress and subsidence for mining gently inclined medium-thick phosphate rock from the Jinning Phosphate Mine, Yunnan Province, China. The stress field, displacement field, and roof failure evolution characteristics of the surrounding rock with stope structures of 3 m, 5 m, or 8 m ore pillars were considered. The results showed that, after mining stopped, obvious pressure relief areas formed above the three stope structures, and pressure-bearing areas formed at the front of the roof. With extending the mining in the working face, the stress relief boundary also gradually increased, and the top of the roof tended to sink with a maximum subsidence of –14.58 mm, –4.67 mm, and –3.48 mm. Due to the mining activity, the overlying strata bent and subsided from top to bottom, creating bending subsidence, fracture, and caving zones.http://dx.doi.org/10.1155/2021/6686981
collection DOAJ
language English
format Article
sources DOAJ
author Xiaoshuang Li
Zhifang Liu
Shun Yang
spellingShingle Xiaoshuang Li
Zhifang Liu
Shun Yang
Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
Advances in Civil Engineering
author_facet Xiaoshuang Li
Zhifang Liu
Shun Yang
author_sort Xiaoshuang Li
title Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
title_short Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
title_full Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
title_fullStr Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
title_full_unstemmed Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
title_sort similar physical modeling of roof stress and subsidence in room and pillar mining of a gently inclined medium-thick phosphate rock
publisher Hindawi Limited
series Advances in Civil Engineering
issn 1687-8094
publishDate 2021-01-01
description Gently inclined medium-thick orebodies are generally recognized as the most difficult type of orebody to mine, using current available strategies (i.e., the room and pillar method). In the present study, a similar physical model was used to investigate the roof stress and subsidence for mining gently inclined medium-thick phosphate rock from the Jinning Phosphate Mine, Yunnan Province, China. The stress field, displacement field, and roof failure evolution characteristics of the surrounding rock with stope structures of 3 m, 5 m, or 8 m ore pillars were considered. The results showed that, after mining stopped, obvious pressure relief areas formed above the three stope structures, and pressure-bearing areas formed at the front of the roof. With extending the mining in the working face, the stress relief boundary also gradually increased, and the top of the roof tended to sink with a maximum subsidence of –14.58 mm, –4.67 mm, and –3.48 mm. Due to the mining activity, the overlying strata bent and subsided from top to bottom, creating bending subsidence, fracture, and caving zones.
url http://dx.doi.org/10.1155/2021/6686981
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AT shunyang similarphysicalmodelingofroofstressandsubsidenceinroomandpillarminingofagentlyinclinedmediumthickphosphaterock
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