Model Test of Rock-Socketed Pile under Axial and Oblique Tension Loading in Combined Composite Ground
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
With the rapid development of transmission-line engineering in western China and the frequent occurrence of extreme natural disasters, a great deal of attention has been paid to the bearing capacity of foundation systems. The uplift capacity is still the controlling factor in the design, but neglecting the horizontal load component will induce great potential risks to the stability of the foundation. This paper describes the model test of rock-socketed piles (with soil overlying rock) that were subjected to axial and oblique tension impacts. Furthermore, the load displacement response, failure mode, and load transfer mechanism of the model piles were compared and discussed. The research indicates that the uplift capacity of the model pile under the oblique load can be remarkably reduced by up to 27.3% in comparison with the vertical uplift. Moreover, the load–displacement curve of the model pile under axial and oblique loads present abrupt failure. Notably, the failure mode under the axial tension is an inverted cone-shaped axisymmetric failure, and the failure mode under the oblique tension shows the wedge failure on the compression side and the interface separation on the tension side. The compression side and tension side show the opposite load transfer mechanism, thus inducing the presence of a bending moment in oblique tension pile. The position of the maximum bending moment occurs at the depth of 2.3–2.8d below ground surface. In summary, the research results of this paper have important guiding significance for design of transmission tower foundation in similar geological settings.
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Acknowledgments
The research was supported by the National Key Research and Development Program of China (Grant No. 2016YFC0802203), Science and Technology Research and Development Program of China Railway Corporation (Grant No. 2013G001-A-2), State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (Grant No. SKLGDUEK2011), and Startup research funding from China University of Mining and Technology (Grant No. 102521227).
Notation
The following symbols are used in this paper:
- A
- cross-sectional area of the model pile;
- b0
- calculated width of pile [for the circular pile, if d ≤ 1 m, then b0 = 0.9(1.5d + 0.5)];
- d
- pile diameter;
- E
- elastic modulus of the model pile;
- H
- horizontal load component;
- I
- moment of inertia of the model pile;
- li
- pile length from depth i−1 to depth i.
- M
- bending moment;
- m
- horizontal resistance coefficient of the soil;
- Qi
- axial force at pile Section i;
- qsi
- side friction between adjacent strain-sensing gauge station i−1 and station i;
- νy
- lateral displacement coefficient of pile top;
- Y0
- horizontal force induced horizontal displacement;
- ɛti, ɛci
- measured strain of Section i on the tension side and the compression side, respectively; and
- ɛi
- measured average strain of Section i.
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Information
Published In
International Journal of Geomechanics
Volume 22 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 17, 2022
Accepted: Apr 30, 2022
Published online: Jul 28, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 28, 2022
ASCE Technical Topics:
- Analysis (by type)
- Axial loads
- Design (by type)
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Failure loads
- Failure modes
- Forensic engineering
- Foundation design
- Foundations
- Geotechnical engineering
- Load bearing capacity
- Load factors
- Load tests
- Load transfer
- Pile foundations
- Pile tests
- Static loads
- Statics (mechanics)
- Structural design
- Structural engineering
- Tests (by type)
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