Failure Envelope of an Underground Rectangular Pipe Gallery in Clay under Pipe–Soil Interactions
Publication: International Journal of Geomechanics
Volume 23, Issue 1
Abstract
Urban underground comprehensive pipe galleries (referred to as UCPGs) often have large rectangular cross sections and are now widely used as underground tunnel spaces for accommodating various engineering pipelines used for power, signal communication, gas, oil, heating, water supply, and drainage channels in China. The force–displacement relation for a pipe–soil interaction is very important since it can be used to evaluate the pipe behavior under various conditions. Conventional theoretical analysis methods are usually proposed for circular cross-sectional pipes, while few methods have been presented for UCPGs with large rectangular cross sections. This paper studies the two-dimensional rectangular pipe–soil interaction problem. The limit resistances of underground rectangular pipe galleries (URPGs) in undrained clay under purely horizontal and vertical loads are first investigated through two-dimensional finite-element limit analysis (FELA). Subsequently, the failure envelope of the URPGs under relative pipe–soil movement along various directions is investigated. Parametric analyses are carried out to derive the empirical equations of the limit resistance and failure envelope of the URPGs. The proposed empirical equations are verified by comparing the theoretical predictions with the FELA results and other researchers’ studies, and they provide a basis for constructing the p–y relation of the pipe–soil interaction.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China, Grant/Award Numbers 51978105 and 52027812; the Chongqing Science Foundation for Distinguished Young Scholars, Grant/Award Number cstc2021jcyj-jqX0017; and the Chongqing Youth Top Talent Plan, Grant/Award Number cstc2021ycjh-bgzxm0132.
Notation
The following symbols are used in this paper:
- a and b
- width and height of the cross section of the rectangular pipe gallery, respectively;
- E
- elastic modulus of the soil;
- Fx and Fy
- limit resistances of the URPG under purely horizontal and vertical loads in uniform clay, respectively;
- Fxρ and Fyρ
- limit resistances of the URPG under purely horizontal and vertical loads in nonuniform clay, respectively;
- h
- buried depth of the pipe gallery;
- m and n
- parameters;
- p and q
- horizontal and vertical component forces of the limit resistance of the URPG under oblique loads in clay, respectively;
- pu0 and qu0
- limit resistances of the URPG under purely horizontal and vertical loads in clay, respectively;
- su0
- USS of the soil at the ground surface;
- su
- USS of the soil;
- sui
- USS of the pipe–soil contact surface;
- α
- cohesion factor of the PS contact surface; and
- ρ
- gradient of the USS along the soil depth.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 23 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 18, 2021
Accepted: Aug 8, 2022
Published online: Nov 4, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 4, 2023
ASCE Technical Topics:
- Analysis (by type)
- Buried pipes
- Clays
- Cross sections
- Energy infrastructure
- Engineering fundamentals
- Failure analysis
- Gas pipelines
- Geomechanics
- Geotechnical engineering
- Infrastructure
- Lifeline systems
- Mathematics
- Oil pipelines
- Pipeline systems
- Pipes
- Soil mechanics
- Soils (by type)
- Structural engineering
- Structures (by type)
- Underground structures
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