Pore Damage Properties and Permeability Change of Coal Caused by Freeze-Thaw Action of Liquid Nitrogen
Joint Authors
Li, Bo
Zhang, Lulu
Wei, Jianping
Ren, Yongjie
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-10-02
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
A laboratory test was conducted to investigate the effect of the freeze-thaw action of liquid nitrogen on the pore structure and permeability of coal rock.
First, coal rock samples with similar sound velocities and permeabilities were selected.
These samples were prepared in different water saturation levels and subjected to nuclear magnetic resonance (NMR) test before and after the freeze-thaw action.
Furthermore, the freeze-thaw cycle of liquid nitrogen, freezing time, and water saturation of coal rocks were controlled in permeability test.
Results showed that the pore diameter, porosity, and permeability of the coal rocks increase after the freeze-thaw action of liquid nitrogen.
These characteristics increase further with the increase of water saturation.
The fracturing mechanisms of the freeze-thaw action of liquid nitrogen were summarized in two aspects, phase change of pore water and cold shock, and cold shock was mainly discussed.
The results indicate that the effect of cold shock is still crucial at low water saturation, but it is limited by the degree of temperature drop.
In general, freeze-thaw action of liquid nitrogen can cause damage to pore structure, promote the formation of fracture networks, and consequently improve the permeability of coal rock.
American Psychological Association (APA)
Li, Bo& Zhang, Lulu& Wei, Jianping& Ren, Yongjie. 2018. Pore Damage Properties and Permeability Change of Coal Caused by Freeze-Thaw Action of Liquid Nitrogen. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1116115
Modern Language Association (MLA)
Li, Bo…[et al.]. Pore Damage Properties and Permeability Change of Coal Caused by Freeze-Thaw Action of Liquid Nitrogen. Advances in Civil Engineering No. 2018 (2018), pp.1-9.
https://search.emarefa.net/detail/BIM-1116115
American Medical Association (AMA)
Li, Bo& Zhang, Lulu& Wei, Jianping& Ren, Yongjie. Pore Damage Properties and Permeability Change of Coal Caused by Freeze-Thaw Action of Liquid Nitrogen. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1116115
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1116115