DOI: 10.1007/s11069-021-04656-2
论文题名: Deformation and fracture at floor area and the correlation with main roof breakage in deep longwall mining
作者: Li C. ; Zuo J. ; Shi Y. ; Wei C. ; Duan Y. ; Zhang Y. ; Yu H.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
卷: 107, 期: 2 起始页码: 1731
结束页码: 1755
语种: 英语
中文关键词: Deep longwall mining
; Deformation and fracture development
; Impact load
; Main roof breakage
; Rock mass at floor area
英文关键词: breakage
; coal mine
; correlation
; deformation
; fracture
; loading
; longwall mining
; rock mass response
; China
英文摘要: Water inrush at floor area is a natural hazard during coal mining. Especially in the northern coalfield of China, more than 55% of coal mines are threatened by water inrush at floor area. The hazard of water inrush is becoming more serious with increasing mining depth. In this paper, the deformation and failure behavior at floor area in deep longwall mining site were analyzed. The correlation between the floor failure and main roof breakage was studied using kinematics theory. Meanwhile, the impact loads of cantilever beam breakage on the floor area at both longwall face and gob area were calculated. Combining with “Pressure arch hypothesis”, the compression and unloading mechanics processes at floor area were analyzed, and the unloading deformation model of floor structure after the breakage of main roof was established as well. In addition, the correlation between unloading deformation at floor area and the main roof breakage, mining depth and unloading stresses were also obtained. Finally, these studies have been verified by using micro-seismic monitoring data in deep longwall mining site. The results show that the impact loads are proportional to the span and loads of cantilever beam. After the breakage of cantilever beam, the impact loads were transferred to the floor area at longwall face side and gob side, and the rock masses at both sides were failed in compression. Consequently, the position of back arch foot of the pressure arch was rapidly transformed into the contact gangue zone at gob area from the last breakage position of main roof. While as the unloading stress of rock masses inside of the floor pressure arch is increasing, the depth of unloading fracture and heave below longwall face are greater than those before cantilever beam breakage. In addition, the unloading deformation at surface floor increases nonlinearly with the increase in mining depth and unloading stresses. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169157
Appears in Collections: 气候变化与战略
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作者单位: Deep Mining and Rock Burst Research Institute, China Academy of Coal Science, Beijing, 100013, China; School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China; Faculty of Engineering, The University of New South Wales, Sydney, NSW 2052, Australia; Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing, 100083, China; Zhaogu (Xinxiang) Limited Company of Jiaozuo Coal Industrial Group, Henan Energy and Chemical Industry Group Co., Ltd, Xinxiang, 453634, China
Recommended Citation:
Li C.,Zuo J.,Shi Y.,et al. Deformation and fracture at floor area and the correlation with main roof breakage in deep longwall mining[J]. Natural Hazards,2021-01-01,107(2)