Experimental Study of Mechanical Characteristics of Tunnel Support System in Hard Cataclastic Rock with High Geostress
Joint Authors
Li, Xinzhi
Sun, Minglei
Zhu, Yongquan
Zhu, Zhengguo
He, Benguo
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-12-04
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
In hard cataclastic surrounding rock with high geostress, the rock monomer strength is high and the rock is broken, and tunnel excavation in it is apt to cause large deformation, collapsing, and breaking, causing initial support crack and even intruding of the initial support deformation.
The characteristics of the support system under different support parameters and shapes are analyzed, and the reasonable support section shape and support parameters are determined.
The results showed that (1) under the condition of high geostress and hard cataclastic surrounding rock, the initial support deformation is large, the horizontal convergence is much larger than the settlement of arch, and the deformation duration is relatively short; (2) the distribution of pressure and stress in initial support are very uneven on the cross-section and greatly affected by the construction process; (3) in the case of large horizontal tectonic stress, the use of large curvature side wall support is beneficial to improve the quality of support and control the deformation of the structure, especially to improve the stress of concrete; (4) the closure time of the supporting system greatly influences the stress state and deformation, so it is necessary to shorten the length of the lower bench and the distance of the invert as possible so as to close the support as early as possible; (5) different location of the tunnel surrounding rock stress distribution is very uneven, the measured value is much larger than calculated value in level III based on the specification of surrounding rock; (6) under high strength and ground stress, the initial supporting stress of steel frame increases rapidly, and the measured stress is larger.
This indicates that the steel frame structure bears heavy early load.
Therefore, the stiffness of the steel frame should be as large as possible to meet the loading requirements.
American Psychological Association (APA)
Sun, Minglei& Zhu, Yongquan& Li, Xinzhi& Zhu, Zhengguo& He, Benguo. 2020. Experimental Study of Mechanical Characteristics of Tunnel Support System in Hard Cataclastic Rock with High Geostress. Shock and Vibration،Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1212698
Modern Language Association (MLA)
Sun, Minglei…[et al.]. Experimental Study of Mechanical Characteristics of Tunnel Support System in Hard Cataclastic Rock with High Geostress. Shock and Vibration No. 2020 (2020), pp.1-12.
https://search.emarefa.net/detail/BIM-1212698
American Medical Association (AMA)
Sun, Minglei& Zhu, Yongquan& Li, Xinzhi& Zhu, Zhengguo& He, Benguo. Experimental Study of Mechanical Characteristics of Tunnel Support System in Hard Cataclastic Rock with High Geostress. Shock and Vibration. 2020. Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1212698
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1212698