Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope

In the mining stage of shallow thick coal seam in the western mining area of China, there is often severe mine pressure and serious surface subsidence and damage. In this paper, theoretical analysis and PFC (Particle Flow Code) numerical simulation are combined to study the caving characteristics an...

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Autores principales:	Yanjun Zhang, Yueguan Yan, Huayang Dai, Yuanhao Zhu, Tianhui Wu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	shallow depth force chain particle flow structural stability inclined step cutting body Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/c32af01c6c514950824d676020c2f6e4
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spelling	oai:doaj.org-article:c32af01c6c514950824d676020c2f6e42021-11-11T15:18:50ZStability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope10.3390/app1121102762076-3417https://doaj.org/article/c32af01c6c514950824d676020c2f6e42021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10276https://doaj.org/toc/2076-3417In the mining stage of shallow thick coal seam in the western mining area of China, there is often severe mine pressure and serious surface subsidence and damage. In this paper, theoretical analysis and PFC (Particle Flow Code) numerical simulation are combined to study the caving characteristics and force chain evolution characteristics of the overlying strata of stope. We analyze the stability of the structure of the “inclined step cutting body” on the overlying strata and obtain the calculation formula of the support force of the working face based on the instability of the structure. The force chain arch curve equation is modified according to the evolution law of force chains, from which the force chain can be the basis for judging the large area damage of the surface. The results demonstrate that the rock mass <i>i</i><sub>1</sub> ≤ 0.86, the structure of “inclined step cutting body,” is not prone to sliding and instability. Considering that <i>i</i> = 1.0~1.4 under the condition of shallow buried thick coal seam, the structure of the “inclined step cutting body” is prone to being destroyed leading to instability, resulting in severe rock pressure.The minimum supporting force to maintain structural stability is 0.2<i>F<sub>n</sub></i>, which is in line with the actual support force in the mining process of the working face. Taking the mining technical parameters of the nearby working face into the force chain arch formula, it can be concluded that, when the working face advances to 175 m, large-scale subsidence damage begins to appear on the surface, which agrees with the survey results. Therefore, the force chain is the main force system to bear the load of the overlying strata. PFC has unique advantages in simulating discontinuous deformation of overburden rock. The results of the study reasonably explain the phenomena of severe mine pressure and serious surface damage caused by the mining of the shallow thick coal seam working face, which has a certain reference value for preventing ground disasters caused by underground mining and land ecological restoration.Yanjun ZhangYueguan YanHuayang DaiYuanhao ZhuTianhui WuMDPI AGarticleshallow depthforce chainparticle flowstructural stabilityinclined step cutting bodyTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10276, p 10276 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	shallow depth force chain particle flow structural stability inclined step cutting body Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	shallow depth force chain particle flow structural stability inclined step cutting body Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Yanjun Zhang Yueguan Yan Huayang Dai Yuanhao Zhu Tianhui Wu Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
description	In the mining stage of shallow thick coal seam in the western mining area of China, there is often severe mine pressure and serious surface subsidence and damage. In this paper, theoretical analysis and PFC (Particle Flow Code) numerical simulation are combined to study the caving characteristics and force chain evolution characteristics of the overlying strata of stope. We analyze the stability of the structure of the “inclined step cutting body” on the overlying strata and obtain the calculation formula of the support force of the working face based on the instability of the structure. The force chain arch curve equation is modified according to the evolution law of force chains, from which the force chain can be the basis for judging the large area damage of the surface. The results demonstrate that the rock mass <i>i</i><sub>1</sub> ≤ 0.86, the structure of “inclined step cutting body,” is not prone to sliding and instability. Considering that <i>i</i> = 1.0~1.4 under the condition of shallow buried thick coal seam, the structure of the “inclined step cutting body” is prone to being destroyed leading to instability, resulting in severe rock pressure.The minimum supporting force to maintain structural stability is 0.2<i>F<sub>n</sub></i>, which is in line with the actual support force in the mining process of the working face. Taking the mining technical parameters of the nearby working face into the force chain arch formula, it can be concluded that, when the working face advances to 175 m, large-scale subsidence damage begins to appear on the surface, which agrees with the survey results. Therefore, the force chain is the main force system to bear the load of the overlying strata. PFC has unique advantages in simulating discontinuous deformation of overburden rock. The results of the study reasonably explain the phenomena of severe mine pressure and serious surface damage caused by the mining of the shallow thick coal seam working face, which has a certain reference value for preventing ground disasters caused by underground mining and land ecological restoration.
format	article
author	Yanjun Zhang Yueguan Yan Huayang Dai Yuanhao Zhu Tianhui Wu
author_facet	Yanjun Zhang Yueguan Yan Huayang Dai Yuanhao Zhu Tianhui Wu
author_sort	Yanjun Zhang
title	Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
title_short	Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
title_full	Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
title_fullStr	Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
title_full_unstemmed	Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope
title_sort	stability and force chain characteristics of “inclined step cutting body” in stope
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c32af01c6c514950824d676020c2f6e4
work_keys_str_mv	AT yanjunzhang stabilityandforcechaincharacteristicsofinclinedstepcuttingbodyinstope AT yueguanyan stabilityandforcechaincharacteristicsofinclinedstepcuttingbodyinstope AT huayangdai stabilityandforcechaincharacteristicsofinclinedstepcuttingbodyinstope AT yuanhaozhu stabilityandforcechaincharacteristicsofinclinedstepcuttingbodyinstope AT tianhuiwu stabilityandforcechaincharacteristicsofinclinedstepcuttingbodyinstope
_version_	1718435391312232448

Stability and Force Chain Characteristics of “Inclined Step Cutting Body” in Stope

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