Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects
There is a huge amount of solid waste generated in coal resource exploitation and utilization, leading to effects on the environment and hindering sustainable development. Aiming at the difficulty of disposal of coal-based solid waste from high-yield, high-efficiency mines, this research proposed a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/5/609 |
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| author | Tailong An Zhongya Wu Jixiong Zhang Yexian Liu Gang Duan Nan Zhou Hao Yan |
| author_facet | Tailong An Zhongya Wu Jixiong Zhang Yexian Liu Gang Duan Nan Zhou Hao Yan |
| author_sort | Tailong An |
| collection | DOAJ |
| description | There is a huge amount of solid waste generated in coal resource exploitation and utilization, leading to effects on the environment and hindering sustainable development. Aiming at the difficulty of disposal of coal-based solid waste from high-yield, high-efficiency mines, this research proposed a technique of gangue grouting filling in subsequent space (GGFSS) for coal mining and explored the movement of key strata backfilled using GGFSS technique and surface deformation characteristics using theoretical analysis and a field measurement method. The results indicate that the equivalent backfilled ratio (EBR) when using GGFSS is defined as the ratio of the grouting volume to available void volume, which is mainly affected by bed separation void volume, grouting volume, and the void volume of the caving zone. Using an EBR ground control mechanical model, the changes in the displacement and bending moment of key strata with the variation of the EBR were investigated. The critical EBR for the rupture of key strata was determined to be 74.44%. On this basis, the calculation methods of equivalent mining height (EMH) and the subsidence factor of GGFSS were proposed and then a surface deformation prediction model of GGFSS was established based on the principle of the probability integration method. The predictions implied that, at an EBR greater than 75%, the surface deformation could be significantly reduced. Engineering applications verified the effect of GGFSS on the control of ground movement. In-situ measurements of concentration, density, and particle size of the filling body were all close to the those designed values: the GGFSS technique shows longer grouting duration and a larger amount of grouting and its filling body can support impervious key strata above the working face in a mine, significantly decreasing surface subsidence. |
| first_indexed | 2024-03-11T03:28:56Z |
| format | Article |
| id | doaj.art-fc220de4344f43ecaf3778fd08a3ae3c |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T03:28:56Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-fc220de4344f43ecaf3778fd08a3ae3c2023-11-18T02:36:02ZengMDPI AGMinerals2075-163X2023-04-0113560910.3390/min13050609Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical EffectsTailong An0Zhongya Wu1Jixiong Zhang2Yexian Liu3Gang Duan4Nan Zhou5Hao Yan6Inner Mongolia Autonomous Region Energy Technology Center, Energy Bureau of Inner Mongolia Autonomous Region, Hohhot 010098, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaShandong Energy Group XiBei Mining Co., Ltd., Xi’an 710018, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaThere is a huge amount of solid waste generated in coal resource exploitation and utilization, leading to effects on the environment and hindering sustainable development. Aiming at the difficulty of disposal of coal-based solid waste from high-yield, high-efficiency mines, this research proposed a technique of gangue grouting filling in subsequent space (GGFSS) for coal mining and explored the movement of key strata backfilled using GGFSS technique and surface deformation characteristics using theoretical analysis and a field measurement method. The results indicate that the equivalent backfilled ratio (EBR) when using GGFSS is defined as the ratio of the grouting volume to available void volume, which is mainly affected by bed separation void volume, grouting volume, and the void volume of the caving zone. Using an EBR ground control mechanical model, the changes in the displacement and bending moment of key strata with the variation of the EBR were investigated. The critical EBR for the rupture of key strata was determined to be 74.44%. On this basis, the calculation methods of equivalent mining height (EMH) and the subsidence factor of GGFSS were proposed and then a surface deformation prediction model of GGFSS was established based on the principle of the probability integration method. The predictions implied that, at an EBR greater than 75%, the surface deformation could be significantly reduced. Engineering applications verified the effect of GGFSS on the control of ground movement. In-situ measurements of concentration, density, and particle size of the filling body were all close to the those designed values: the GGFSS technique shows longer grouting duration and a larger amount of grouting and its filling body can support impervious key strata above the working face in a mine, significantly decreasing surface subsidence.https://www.mdpi.com/2075-163X/13/5/609solid waste disposalsubsequent spacegangue grouting fillingground controlsurface deformation |
| spellingShingle | Tailong An Zhongya Wu Jixiong Zhang Yexian Liu Gang Duan Nan Zhou Hao Yan Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects Minerals solid waste disposal subsequent space gangue grouting filling ground control surface deformation |
| title | Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects |
| title_full | Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects |
| title_fullStr | Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects |
| title_full_unstemmed | Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects |
| title_short | Strata Movement of Gangue Grouting Filling in Subsequent Space for Coal Mining and Analysis of Its Practical Effects |
| title_sort | strata movement of gangue grouting filling in subsequent space for coal mining and analysis of its practical effects |
| topic | solid waste disposal subsequent space gangue grouting filling ground control surface deformation |
| url | https://www.mdpi.com/2075-163X/13/5/609 |
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