Abstract
Pile foundation is an economic foundation system for supporting overhead power lines and resisting the large uplift force under high-intensity wind effects. However, the failure mode and ultimate capacity calculation method of rock-socketed pile has not been well documented due to the complicated interaction of pile-rock. In this paper, a series of static loading tests was carried out to investigate uplift piles in soil–rock combined layers using a geotechnical centrifuge, and the failure mode of bedrock and ultimate uplift capacity of rock-socketed piles were subsequently explored. Moreover, an analytical model is developed and proposed to determine the ultimate uplift capacity using the limit equilibrium method and nonlinear Mohr–Coulomb criterion. Upon validation of the analytical model using centrifuge model results, a series of sensitivity analyses of ultimate uplift capacity was conducted. Our results indicate that the bedrock around straight-sided pile presents a composite failure mode under the effect of uplift force (the geometric parameters of the failure mode were also determined). The observed consistency between the experimental results and theoretical results validates the applicability of the proposed method. Furthermore, we explored the ultimate uplift capacity in soil–rock combined layers whereby the impact of pile diameter, rock-socketed length, bedrock internal friction angle and cohesion, the uniaxial tensile strength of bedrock, and nonlinear Mohr–Coulomb failure criterion on the ultimate uplift capacity was investigated. The research results in this paper are of practical significance for the uplift design and optimization of pile foundation in combined composite ground (e.g., soil–rock combined layers).
Highlights
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The bedrock part of the straight-sided pile shows a combined failure mode under uplift force.
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An analytical model is proposed to determine the ultimate uplift capacity using the limit equilibrium method and nonlinear Mohr-Coulomb criterion.
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The critical factors which can influence the ultimate bearing capacity of rocksocketed uplift piles are revealed.
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Acknowledgements
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), and State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (SKLGDUEK2011).
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Wang, Q., Hu, Z., Ji, Y. et al. Centrifugal Model Test Based Bearing Characteristics and Analytical Model of Uplift Pile in Combined Composite Ground. Rock Mech Rock Eng 55, 3525–3543 (2022). https://doi.org/10.1007/s00603-022-02820-z
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DOI: https://doi.org/10.1007/s00603-022-02820-z