Application of Improved Single-Hole Superposition Theory in Nonequal Cross-Section Tunnel Intersection
Joint Authors
Liu, Ning
Huang, Yi-Xiong
Cai, Wei
Chen, Kun
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-15, 15 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-12-10
Country of Publication
Egypt
No. of Pages
15
Main Subjects
Abstract EN
With the excavation towards the intersecting tunnels’ direction, the impact on the surrounding rock stress between the two tunnels will gradually decrease, but how it decreased is not clear.
At present, engineers often directly superimpose the stress in the triangular area of the crossing tunnel when calculating the stress in this area (single-hole superposition theory).
The theory is also used as the main theory to consider the surrounding rock stress for support which is difficult to explain the situation of nonuniform cross-section centers not in the same plane.
The safety level of support is mainly determined by construction experience which is unable to determine how to adjust the support level with the increase in the horizontal distance of intersecting tunnel, causing the insufficient utilization of materials.
This paper derives theoretically the stress calculation of the triangular area of circular cross tunnels with different cross sections and analyzes the surrounding rock stress law of the intersecting tunnels triangular area from different cross-section dimensions (the difference in diameter between the two tunnels is twice, 3 times, and 4 times) and different intersection angles.
And the results show that, compared with the case of equal tunnel diameters, the stress influence area of the surrounding rock in the triangle area mainly expands to the side of the small section with the increase of the cross-section difference of the intersecting tunnels; the dangerous area of the surrounding rock in the triangle area moves vertically to the small section; the safest condition is the two tunnels with 90° intersecting angle.
The theoretical calculation model of this paper is verified by the previous research results.
American Psychological Association (APA)
Liu, Ning& Huang, Yi-Xiong& Cai, Wei& Chen, Kun. 2020. Application of Improved Single-Hole Superposition Theory in Nonequal Cross-Section Tunnel Intersection. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-15.
https://search.emarefa.net/detail/BIM-1123620
Modern Language Association (MLA)
Liu, Ning…[et al.]. Application of Improved Single-Hole Superposition Theory in Nonequal Cross-Section Tunnel Intersection. Advances in Civil Engineering No. 2020 (2020), pp.1-15.
https://search.emarefa.net/detail/BIM-1123620
American Medical Association (AMA)
Liu, Ning& Huang, Yi-Xiong& Cai, Wei& Chen, Kun. Application of Improved Single-Hole Superposition Theory in Nonequal Cross-Section Tunnel Intersection. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-15.
https://search.emarefa.net/detail/BIM-1123620
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1123620