Quantitative Precursory Information of Weak Shocking Failures of Composite Soft Roof
Joint Authors
Tian, Zhong-xi
Sun, Wei
Wang, Lihua
Zhao, Zeng-hui
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-02-17
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
To reveal the mechanism of weak roof shocking in mine roadway arranged in weakly consolidated soft rock strata commonly observed in western China, a bearing system of composite roof composed of weakly consolidated soft rocks and coal layers was proposed.
Then, theoretical analysis and numerical calculation were applied for instability failures of the mass bearing system with strong body and weak body.
Eventually, precursory information and criteria of instability failures of the bearing system were developed.
The main conclusions obtained are as follows: (1) as the elastic energy released at the postpeak failure stage of weak body contributes to system failures, the equivalent stiffness for system failures consists of the stiffness of strong body and the deterioration stiffness of weak body at softening stage; (2) during the loading process of the two-body system, isochronous sudden jumps of the deformation rate in either body can be regarded as the precursory information of weak impact failures; (3) the frequency of sudden jumps of deformation rate is significantly related to the stiffness, indicating that weak impact failures are readily observed in composite soft roof as stiffnesses of weakly consolidated soft rocks and coal seam are close to each other.
This study provides references for prevention and control of weak shocking disasters of composite roofs in western China.
American Psychological Association (APA)
Wang, Lihua& Zhao, Zeng-hui& Tian, Zhong-xi& Sun, Wei. 2019. Quantitative Precursory Information of Weak Shocking Failures of Composite Soft Roof. Shock and Vibration،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1211070
Modern Language Association (MLA)
Wang, Lihua…[et al.]. Quantitative Precursory Information of Weak Shocking Failures of Composite Soft Roof. Shock and Vibration No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1211070
American Medical Association (AMA)
Wang, Lihua& Zhao, Zeng-hui& Tian, Zhong-xi& Sun, Wei. Quantitative Precursory Information of Weak Shocking Failures of Composite Soft Roof. Shock and Vibration. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1211070
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1211070