Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

Determining a reasonable barrier pillar along gob-side entry of spontaneous combustion coal seam is of great significance to the prevention of spontaneous combustion. In this paper, considering the actual situation of 4301 and 4302 working faces of II-class spontaneous combustion coal seam in Changh...

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Autores principales:	Qiang Fu, Ke Yang, Qinjie Liu, Shuai Liu, Xiang He, Xin Lyu
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/3be155033dbf474f8c1dd11222407e2a
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spelling	oai:doaj.org-article:3be155033dbf474f8c1dd11222407e2a2021-11-08T02:37:15ZOptimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam1468-812310.1155/2021/2749373https://doaj.org/article/3be155033dbf474f8c1dd11222407e2a2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/2749373https://doaj.org/toc/1468-8123Determining a reasonable barrier pillar along gob-side entry of spontaneous combustion coal seam is of great significance to the prevention of spontaneous combustion. In this paper, considering the actual situation of 4301 and 4302 working faces of II-class spontaneous combustion coal seam in Changheng Mine, the characteristics of rock mass collapse and mining-induced stress redistribution of barrier pillar and adjacent area were analyzed, the cusp catastrophe model of coal pillar instability and the theoretical model of limit width of coal pillar air leakage spontaneous combustion were established, and a measurement scheme of side abutment pressure in 4301 working face was carried out. The theoretical model of the coal pillar along the gob-side entry shows that its instability is related to density of overlying strata, physical and mechanical parameters of coal body, dip angle of coal seam and weak face, and buried depth and mining width of working face. And the coal pillar in 4302 working face will be unstable if the width a≤6.8 m. Field measured data shows that 2-8 m is the stress-relaxation area of side solid coal. Then, the width of coal pillar was determined as 7 m. The maximum displacement of rib-to-rib and roof-to-floor of 4302 tailentry was 520 mm and 280 mm, respectively. The coal spontaneous combustion (CSC) observation monitoring results showed that the carbon monoxide volume fraction was in the normal range during the entire process of mining, and no other signs of gas were found. The research results can provide a reference for the barrier pillar designing in the mines under similar conditions.Qiang FuKe YangQinjie LiuShuai LiuXiang HeXin LyuHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Qiang Fu Ke Yang Qinjie Liu Shuai Liu Xiang He Xin Lyu Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
description	Determining a reasonable barrier pillar along gob-side entry of spontaneous combustion coal seam is of great significance to the prevention of spontaneous combustion. In this paper, considering the actual situation of 4301 and 4302 working faces of II-class spontaneous combustion coal seam in Changheng Mine, the characteristics of rock mass collapse and mining-induced stress redistribution of barrier pillar and adjacent area were analyzed, the cusp catastrophe model of coal pillar instability and the theoretical model of limit width of coal pillar air leakage spontaneous combustion were established, and a measurement scheme of side abutment pressure in 4301 working face was carried out. The theoretical model of the coal pillar along the gob-side entry shows that its instability is related to density of overlying strata, physical and mechanical parameters of coal body, dip angle of coal seam and weak face, and buried depth and mining width of working face. And the coal pillar in 4302 working face will be unstable if the width a≤6.8 m. Field measured data shows that 2-8 m is the stress-relaxation area of side solid coal. Then, the width of coal pillar was determined as 7 m. The maximum displacement of rib-to-rib and roof-to-floor of 4302 tailentry was 520 mm and 280 mm, respectively. The coal spontaneous combustion (CSC) observation monitoring results showed that the carbon monoxide volume fraction was in the normal range during the entire process of mining, and no other signs of gas were found. The research results can provide a reference for the barrier pillar designing in the mines under similar conditions.
format	article
author	Qiang Fu Ke Yang Qinjie Liu Shuai Liu Xiang He Xin Lyu
author_facet	Qiang Fu Ke Yang Qinjie Liu Shuai Liu Xiang He Xin Lyu
author_sort	Qiang Fu
title	Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
title_short	Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
title_full	Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
title_fullStr	Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
title_full_unstemmed	Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam
title_sort	optimization of barrier pillar design in longwall mining with top coal caving in spontaneous combustion coal seam
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/3be155033dbf474f8c1dd11222407e2a
work_keys_str_mv	AT qiangfu optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam AT keyang optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam AT qinjieliu optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam AT shuailiu optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam AT xianghe optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam AT xinlyu optimizationofbarrierpillardesigninlongwallminingwithtopcoalcavinginspontaneouscombustioncoalseam
_version_	1718442990940192768

Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

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