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Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar
Joint Authors
Pan, Hongyu
Zhang, Xiufeng
Zhang, Tianjun
Pang, Mingkun
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-07-25
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
The karst collapse pillar (KCP) is a common geological structure in the coal mines of northern China.
KCPs contain many fractured coal rocks, which can easily migrate under the action of high-pressure water.
The destruction or instability of the cementation structure between the rocks can directly induce coalmine water-inrush accidents.
To study the seepage stability of cemented and fractured coal rock under triaxial pressures, a self-designed triaxial seepage testing system was used and the permeability k and non-Darcy factor β of the cemented and fractured coal rock were tested.
Furthermore, the 1D non-Darcy seepage equations were used to calculate the evolution criteria of the seepage loss stability.
The results show the following: (1) The cemented structure in the KCP under the triaxial pressures can be easily destroyed.
The damaged coal and rock body mainly exists in bulk form, and the permeability depends mainly on the effective stress of the particles.
(2) The seepage process in the KCP structure is a combination of pore flow, fracture flow, and pipe flow, and the transition of the seepage state is closely related to the change in the magnitude of β.
(3) Under the long-term effect of confined underground water, the migration of small fractured particles in the KCP will increase the structural porosity.
If the parameter βk2 reaches the threshold value, the seepage system will evolve into a pipeline flow state, eventually causing a water-inrush accident.
American Psychological Association (APA)
Zhang, Tianjun& Pang, Mingkun& Zhang, Xiufeng& Pan, Hongyu. 2020. Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1121030
Modern Language Association (MLA)
Zhang, Tianjun…[et al.]. Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar. Advances in Civil Engineering No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1121030
American Medical Association (AMA)
Zhang, Tianjun& Pang, Mingkun& Zhang, Xiufeng& Pan, Hongyu. Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1121030
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1121030