Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway
Joint Authors
Liu, Wengang
Wang, Xinfeng
Lu, Mingyuan
Gao, Yuhao
Luo, Wenbo
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-12-15
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
The influence of mining on the upper section of working face leads to the fracture of the lateral key block of the roof.
From the goaf to the coal body, a group of “left-middle-right” key blocks are formed.
According to the three different spatial position structure relations formed by roadway and broken key block in practical engineering, the mechanical causes of broken structure of key block in roof of roadway along goaf are analyzed.
FLAC3D is used to simulate and analyze the deformation characteristics and stress state of key block structure model before and after roadway excavation, and the mechanical characteristics and instability mechanism of key block sliding and breaking under three spatial structure modes are obtained.
With the help of the mathematical model of material mechanics, the structural mechanical behavior of key block model of roof before and after roadway excavation and the temporal and spatial evolution law of unloading and breaking are studied.
The results show that the complex influence factors of mining disturbance and low strength of the weak rock mass will weaken the internal balance of “masonry beam” structure.
When the roadway is located below the fracture line of the key block, the middle key block will rotate and lose stability with the side hinge joint of the goaf as the axis; when the roadway is located in the fracture line of the key block, it is easy for the middle key block to slide and lose stability; when the roadway is located outside the fracture line of the key block, the middle key block is in the state of complete collapse, the mechanical transmission mechanism of the surrounding rock in the vertical direction is weakened, and the surrounding rock is the most stable.
American Psychological Association (APA)
Wang, Xinfeng& Lu, Mingyuan& Gao, Yuhao& Luo, Wenbo& Liu, Wengang. 2020. Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1122496
Modern Language Association (MLA)
Wang, Xinfeng…[et al.]. Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway. Advances in Civil Engineering No. 2020 (2020), pp.1-12.
https://search.emarefa.net/detail/BIM-1122496
American Medical Association (AMA)
Wang, Xinfeng& Lu, Mingyuan& Gao, Yuhao& Luo, Wenbo& Liu, Wengang. Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1122496
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1122496