Bearing Capacities and Failure Behaviors of F-Type Socket Joint in Rectangular Pipe Jacking Tunnel
Abstract
:1. Introduction
2. Full-Scale Experiments
2.1. Experiments Background
2.2. Test Overview Rectangle Pipe Jacking
2.3. Analysis of Test Data
2.3.1. Failure Behaviors
2.3.2. Stress Deformation of Pipe Joint
2.3.3. Deformation of Pipe Joint Section
3. Numerical Simulations
3.1. Model Size and Material Parameters
3.2. Numerical Results and Comparisons to the Tests
4. Parametric Analysis
4.1. Analysis of Cross-Sectional Dimensions
4.2. Analysis of Steel Ring Dimensions
5. Conclusions
- (1)
- Under the same loading displacement, the greater the foundation stiffness, the greater the bending moment borne by the joint, and the higher the joint bending capacity. The bending moment of the joint is mainly borne by the steel ring, which will eventually be damaged by bending.
- (2)
- The change of joint opening is closely related to the change of joint bending moment; the larger the joint bending moment, the larger the corresponding joint opening. In addition, the larger deformation of the pipe joint itself will lead to a slower rate of change of the joint opening, resulting in an increase in the slope of the joint bending stiffness.
- (3)
- The deformation of the pull-wire displacement gauge at the joint, the concrete strain and the steel collar strain show the same change pattern, which all indicate that the joint tends to be flattened during the bending loading process.
- (4)
- The deformation of the steel collar is closely related to the deformation of concrete, and the two are in the same state of stress at the same position. In addition, the top bottom plate of the steel ring will be warped near the socket side, and the degree of warping is most obvious at the axillary corner of the top bottom plate due to stress concentration. When the bottom of the pipe joint is separated from the socket end, the structure is eventually deformed due to the large deformation of the bottom of the pipe joint.
- (5)
- Joint bending deformation is influenced by the foundation stiffness of the strata. The larger the foundation stiffness and the harder the strata, the smaller the joint bending deformation; the larger the section size of the pipe joint, the smaller the joint bending deformation; the larger the size of the steel collar, the smaller the joint bending deformation.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Material | Elastic Modulus (MPa) | Cube Compressive Strength fcu/ MPa | Yield Strength fy/ MPa | Extreme Strong fu/ MPa | Shore A Hardness/° | Tensile Strength/ MPa |
---|---|---|---|---|---|---|
concrete | 34,500 | 53.1 | ||||
Q235 | 19,600 | 216 | 352 | |||
HRB400 | 203,000 | 385 | 527 | |||
rubber | 54 | 12.2 |
Loading Conditions | Number of Springs/ Size | Equivalent Bed Coefficient /(×103 kN-m−3) | Equivalent Stratum (Geology) |
---|---|---|---|
Option I | 9 | 10.16 | loose sandy soil |
Option I | 6 | 6.77 | soft clay |
Option 3 | 4 | 4.52 | freshly filled soil |
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Xu, Y.; Huang, Z.; Zhang, C.; Pang, Y.; Liu, T. Bearing Capacities and Failure Behaviors of F-Type Socket Joint in Rectangular Pipe Jacking Tunnel. Appl. Sci. 2023, 13, 5442. https://doi.org/10.3390/app13095442
Xu Y, Huang Z, Zhang C, Pang Y, Liu T. Bearing Capacities and Failure Behaviors of F-Type Socket Joint in Rectangular Pipe Jacking Tunnel. Applied Sciences. 2023; 13(9):5442. https://doi.org/10.3390/app13095442
Chicago/Turabian StyleXu, Youjun, Zhengdong Huang, Chao Zhang, Yuekui Pang, and Tianyu Liu. 2023. "Bearing Capacities and Failure Behaviors of F-Type Socket Joint in Rectangular Pipe Jacking Tunnel" Applied Sciences 13, no. 9: 5442. https://doi.org/10.3390/app13095442