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Environmental Earth Sciences

, 78:565 | Cite as

An approach for calculating the vertical ultimate bearing capacity of a shallow circular foundation

  • Qingke Nie
  • Wei YuanEmail author
  • Xiuling Cao
  • Jianming Li
  • Wei Wang
Original Article
  • 33 Downloads

Abstract

In this work, a new method for the vertical bearing capacity of a shallow circular foundation was proposed with the amended formula by combining the limit equilibrium method and the principle of conservation of energy. Then the vertical ultimate bearing capacity of eight different circular foundations was acquired with the above mentioned method, an empirical formula method, and the static load test to obtain comparative results. The results showed that the relative error for the proposed method was deemed as the most accurate, close to the result of Vesic method, while much less than the relative error for both Meyerhof method and Hansen method. In addition, the impact factors for vertical ultimate bearing capacity including density, cohesion, friction angle of soil, radius, and burial depth of shallow circular foundation were also discussed, indicating that the shear strength parameters and density of soil, and especially the friction angle were the main influencing factors of the bearing capacity.

Keywords

Shallow circular foundation Vertical ultimate bearing capacity Limit equilibrium Conservation of energy Shear sliding 

List of symbols

Vs

The volume of shear slip zone

q

Uniformly distributed load from soil weight above the base plane

c, φ

The cohesion and friction angle of foundation soil

hq

The burial depth of circular foundation

Fpbu

The ultimate minimum vertical load of circular foundation

τN

The shear force in the direction of sliding surface

ERi

The relative error

y

The bearing capacity according to approximated relationship of Eq. 4

F1, F2, F3, F4, F5

Lateral extrusion force, the normal force of slip surface, the shear force of slip surface, its own gravity, and additional force, respectively

D, ∆Y

The resultant displacement and vertical displacement of shear slip zone

SN, SF

A lateral surface area and an internal surface area

σF

Extrusion force from lateral compression expansion

hc

The above mentioned effective depth of circular foundation

γq

Soil weight

Pu

Ultimate bearing capacity of shallow circular foundation

σN,στ

The normal stress and the shear stress of shear slip surface

σ

The standard error

δ

An evaluation index with the effect degree of impact factors on the vertical bearing capacity

h, ∆r

The vertical and horizontal deformation increments

Notes

Acknowledgements

The author thanks Prof. Dr. Xiuying Cao for providing many instructions in this research. This work was supported by Collaborative Research Project of China and Australia (No. 16394507D), National Natural Science Foundation of China (No. 50978022), Provincial intelligence introduction project (No. Z20180288), and Introducing High-level Overseas Talent Funding Projects (No. 201703).

Complaince with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Hebei Research Institute of Construction and Geotechnical Investigation Co., Ltd.ShijiazhuangChina
  2. 2.School of Civil EngineeringShijiazhuang Tiedao UniversityShijiazhuangChina
  3. 3.Research Center of Geotechnical Engineering TechnologyShijiazhuangChina
  4. 4.Hebei GEO UniversityShijiazhuangChina

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