Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance

Because of daily maintenance, equipment damage, gas overrun, and other force majeure factors, the continuous stopping of the working face causes the roof pressure to accumulate, which leads to causing accidents such as coal wall spalling and roof falling. To address the roof safety problem caused by...

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Main Authors: Xiaoxu Gao, Xinyu Shi, Weibin Guo
Format: Article
Language:English
Published: Hindawi Limited 2021-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2021/5574693
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spelling doaj-2f23b6c798c2491f855944579f2171a42021-08-02T00:00:47ZengHindawi LimitedAdvances in Civil Engineering1687-80942021-01-01202110.1155/2021/5574693Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of AdvanceXiaoxu Gao0Xinyu Shi1Weibin Guo2Xi’an University of Science and TechnologyXi’an University of Science and TechnologyXi’an University of Science and TechnologyBecause of daily maintenance, equipment damage, gas overrun, and other force majeure factors, the continuous stopping of the working face causes the roof pressure to accumulate, which leads to causing accidents such as coal wall spalling and roof falling. To address the roof safety problem caused by continuous stoppages, the 620 working face in the Huangling mining area is taken as the research object. Through field measurement, theoretical analysis, numerical simulation, and other research methods, the influence and mechanism of stopping pressure under different rates of advance are studied. The results show that the velocity factor of roof load transfer is positively correlated with the advancing velocity of the working face; the reasonable length of the suspended roof is mainly affected by the number of caving holes and the effect of pressure relief; and comparing the two stages of advance speed of 4.8 m/d and 12.8 m/d, the periodic weighting step distance of the latter increases by 24.4% compared with the former, and the rate of increase of support load caused by stopping mining increases by 42.1% compared with the former. The roof pressure accumulation caused by stopping mining is increased. Taking appropriate measures for local forced caving of the working face can release the roof pressure and reduce the risk of local caving of the working face. The study can provide a theoretical basis for roof control of continuous stopping under similar engineering conditions.http://dx.doi.org/10.1155/2021/5574693
collection DOAJ
language English
format Article
sources DOAJ
author Xiaoxu Gao
Xinyu Shi
Weibin Guo
spellingShingle Xiaoxu Gao
Xinyu Shi
Weibin Guo
Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
Advances in Civil Engineering
author_facet Xiaoxu Gao
Xinyu Shi
Weibin Guo
author_sort Xiaoxu Gao
title Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
title_short Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
title_full Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
title_fullStr Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
title_full_unstemmed Case Study on the Mechanism of Influence of Stoppage on Ground Pressure under Different Rates of Advance
title_sort case study on the mechanism of influence of stoppage on ground pressure under different rates of advance
publisher Hindawi Limited
series Advances in Civil Engineering
issn 1687-8094
publishDate 2021-01-01
description Because of daily maintenance, equipment damage, gas overrun, and other force majeure factors, the continuous stopping of the working face causes the roof pressure to accumulate, which leads to causing accidents such as coal wall spalling and roof falling. To address the roof safety problem caused by continuous stoppages, the 620 working face in the Huangling mining area is taken as the research object. Through field measurement, theoretical analysis, numerical simulation, and other research methods, the influence and mechanism of stopping pressure under different rates of advance are studied. The results show that the velocity factor of roof load transfer is positively correlated with the advancing velocity of the working face; the reasonable length of the suspended roof is mainly affected by the number of caving holes and the effect of pressure relief; and comparing the two stages of advance speed of 4.8 m/d and 12.8 m/d, the periodic weighting step distance of the latter increases by 24.4% compared with the former, and the rate of increase of support load caused by stopping mining increases by 42.1% compared with the former. The roof pressure accumulation caused by stopping mining is increased. Taking appropriate measures for local forced caving of the working face can release the roof pressure and reduce the risk of local caving of the working face. The study can provide a theoretical basis for roof control of continuous stopping under similar engineering conditions.
url http://dx.doi.org/10.1155/2021/5574693
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