Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study

The negative impacts of underground longwall coal mining on water resources and ecological environment are associated with changing overburden permeability and subsurface watertable. For weakly cemented strata characterized by short diagenesis, low strength, easy swelling and mudding with water, ove...

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Autores principales:	Shizhong Zhang, Gangwei Fan, Dongsheng Zhang, Shaodong Li, Mingwei Chen, Yibo Fan, Tao Luo
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	weakly cemented strata advancing speed overburden permeability subsurface watertable vertical drawdown Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Risk in industry. Risk management HD61
Acceso en línea:	https://doaj.org/article/e1c7d5c1e03e44489187e9d80e50817e
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spelling	oai:doaj.org-article:e1c7d5c1e03e44489187e9d80e50817e2021-11-04T15:00:42ZImpacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study1947-57051947-571310.1080/19475705.2021.1993354https://doaj.org/article/e1c7d5c1e03e44489187e9d80e50817e2021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/19475705.2021.1993354https://doaj.org/toc/1947-5705https://doaj.org/toc/1947-5713The negative impacts of underground longwall coal mining on water resources and ecological environment are associated with changing overburden permeability and subsurface watertable. For weakly cemented strata characterized by short diagenesis, low strength, easy swelling and mudding with water, overburden permeability and subsurface watertable are highly sensitive to the advancing speed of the longwall. In this paper, the longwall panel 21103 in Yili No.4 Coal Mine, Xinjiang, China, where weakly cemented strata exist in Jurassic and Palaeogene systems, was taken as the case to study the response of overburden permeability and subsurface watertable to different advancing speeds. Results show that there is a butterfly-shaped permeability-increasing area comprised of a trapezoid and double V-shaped subareas in overburden. Generally, the permeability curves of aquiclude are of double peaks. In shallow aquifer, there is an exponential decline in the maximum drawdown of watertable, while a linear decline in lateral influence range as the speed goes up. If constrained by the ultimate watertable drawdown still being able to sustain the regular growth of vegetative covers, the optimal minimum advancing speed of panel 21103 is determined as 8 m/d, which is demonstrated by field verification.Shizhong ZhangGangwei FanDongsheng ZhangShaodong LiMingwei ChenYibo FanTao LuoTaylor & Francis Grouparticleweakly cemented strataadvancing speedoverburden permeabilitysubsurface watertablevertical drawdownEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350Risk in industry. Risk managementHD61ENGeomatics, Natural Hazards & Risk, Vol 12, Iss 1, Pp 3063-3088 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	weakly cemented strata advancing speed overburden permeability subsurface watertable vertical drawdown Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Risk in industry. Risk management HD61
spellingShingle	weakly cemented strata advancing speed overburden permeability subsurface watertable vertical drawdown Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Risk in industry. Risk management HD61 Shizhong Zhang Gangwei Fan Dongsheng Zhang Shaodong Li Mingwei Chen Yibo Fan Tao Luo Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
description	The negative impacts of underground longwall coal mining on water resources and ecological environment are associated with changing overburden permeability and subsurface watertable. For weakly cemented strata characterized by short diagenesis, low strength, easy swelling and mudding with water, overburden permeability and subsurface watertable are highly sensitive to the advancing speed of the longwall. In this paper, the longwall panel 21103 in Yili No.4 Coal Mine, Xinjiang, China, where weakly cemented strata exist in Jurassic and Palaeogene systems, was taken as the case to study the response of overburden permeability and subsurface watertable to different advancing speeds. Results show that there is a butterfly-shaped permeability-increasing area comprised of a trapezoid and double V-shaped subareas in overburden. Generally, the permeability curves of aquiclude are of double peaks. In shallow aquifer, there is an exponential decline in the maximum drawdown of watertable, while a linear decline in lateral influence range as the speed goes up. If constrained by the ultimate watertable drawdown still being able to sustain the regular growth of vegetative covers, the optimal minimum advancing speed of panel 21103 is determined as 8 m/d, which is demonstrated by field verification.
format	article
author	Shizhong Zhang Gangwei Fan Dongsheng Zhang Shaodong Li Mingwei Chen Yibo Fan Tao Luo
author_facet	Shizhong Zhang Gangwei Fan Dongsheng Zhang Shaodong Li Mingwei Chen Yibo Fan Tao Luo
author_sort	Shizhong Zhang
title	Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
title_short	Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
title_full	Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
title_fullStr	Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
title_full_unstemmed	Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
title_sort	impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/e1c7d5c1e03e44489187e9d80e50817e
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Impacts of longwall mining speeds on permeability of weakly cemented strata and subsurface watertable: a case study

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