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The Influence of Heading Rate on Roof Stability in Coal Entry Excavation
Joint Authors
Zhang, Nong
Feng, Xiaowei
Qian, Deyu
Yang, Sen
Pan, Dongjiang
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-15, 15 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-08-29
Country of Publication
Egypt
No. of Pages
15
Main Subjects
Abstract EN
Coal entry heading is one of the most hazardous activities in coal mine operations because a certain area of an unsupported roof inevitably forms and poses a significant threat to the safety of miners.
In order to accelerate the coal entry heading, a simplified method including theoretical analysis and laboratory and in situ tests was developed to predict the influence of heading rate on the stability of the unsupported immediate roof.
The results demonstrate that the deflection of the unsupported immediate roof at the heading face is on a scale of millimetre; hence, monitoring the deformation by conventional observation methods is difficult.
The proposed model shows that, within the unsupported immediate roof, the peak values of normal stresses σx (perpendicular to the direction of excavation) and σy (parallel to the direction of excavation) and shear stresses τxz (perpendicular to the direction of excavation) and τyz (parallel to the direction of excavation) have different changing trends.
The peak values of σx and σy both rise with the increasing advancing distance; however, σy reaches the tensile strength within a shorter range than σx.
Moreover, the peak values of τxz and τyz initially increase with the increasing advancing distance and then stabilize or decline.
The major threat to roof stability at the heading face is tensile failure parallel to the heading direction.
According to the industry practices, it is proved that our method can make a good prediction of the mechanical state of the unsupported immediate roof, further deriving the heading rate with a considerable safety margin.
American Psychological Association (APA)
Yang, Sen& Zhang, Nong& Feng, Xiaowei& Pan, Dongjiang& Qian, Deyu. 2018. The Influence of Heading Rate on Roof Stability in Coal Entry Excavation. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-15.
https://search.emarefa.net/detail/BIM-1117021
Modern Language Association (MLA)
Yang, Sen…[et al.]. The Influence of Heading Rate on Roof Stability in Coal Entry Excavation. Advances in Civil Engineering No. 2018 (2018), pp.1-15.
https://search.emarefa.net/detail/BIM-1117021
American Medical Association (AMA)
Yang, Sen& Zhang, Nong& Feng, Xiaowei& Pan, Dongjiang& Qian, Deyu. The Influence of Heading Rate on Roof Stability in Coal Entry Excavation. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-15.
https://search.emarefa.net/detail/BIM-1117021
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1117021