干旱区生态环境知识资源中心(Arid): Simulation of geothermal evolution of an opencast coal mine during the excavation-backfilling process in permafrost region

Arid

DOI	10.1007/s12665-022-10366-0
	Simulation of geothermal evolution of an opencast coal mine during the excavation-backfilling process in permafrost region
	Yang, Suiqiao; Zhang, Hu
通讯作者	Zhang, H
来源期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
EISSN	1866-6299
出版年	2022
卷号	81 期号:9
英文摘要	The excavation and backfilling of opencast coal mines in permafrost regions inevitably changes the geothermal state and degenerates surrounding permafrost, causing severe engineering and environmental problems-thaw slumping, ground fissures, vegetation degradation and desertification. Therefore, it is desirable to investigate the thermal regime evolution within the mining area during the whole excavation-backfilling process to evaluate permafrost degradation and related negative effects. Numerical simulations were performed for different mean annual ground temperature (MAGT) and backfill temperature conditions. Measured ground temperatures confirmed the reliability of the numerical model and simulation parameters. During excavation, 4.0-5.0 m thick permafrost beneath mine pit base or slopes becomes an active layer. Deepening of the mine pit continually reduces the thickness of the underlying permafrost, or might pierce it if the MAGT is high. An abrupt change in temperature initially forms in the transitional segment between backfill and natural ground following backfilling, which may postpone the warming of cold backfill or the cooling of warm backfill. Backfill temperature and MAGT are both key factors in controlling frozen ground recovery in the mine pit. A lower backfill temperature is more favorable than a lower MAGT in refreezing the soil in the pit. Higher thermal conductivity induces faster refreezing than that caused by lower thermal conductivity. The cold season is recommended to backfill the mine pit for faster recovery of the frozen ground by lowering the backfill temperature. This study provides a theoretical reference for green coal mining and rapid environmental recovery in permafrost regions.
英文关键词	Open-cast coal mine Geothermal evolution Permafrost region Numerical simulation Excavation Backfilling
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000784978700002
WOS关键词	OPEN-PIT ; AREA
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392445
推荐引用方式 GB/T 7714	Yang, Suiqiao,Zhang, Hu. Simulation of geothermal evolution of an opencast coal mine during the excavation-backfilling process in permafrost region[J],2022,81(9).
APA	Yang, Suiqiao,&Zhang, Hu.(2022).Simulation of geothermal evolution of an opencast coal mine during the excavation-backfilling process in permafrost region.ENVIRONMENTAL EARTH SCIENCES,81(9).
MLA	Yang, Suiqiao,et al."Simulation of geothermal evolution of an opencast coal mine during the excavation-backfilling process in permafrost region".ENVIRONMENTAL EARTH SCIENCES 81.9(2022).