Introduction The paper aims to improve the uplift bearing capacity of transmission tower foundations and to save the cost of project.
Method In this paper， a method for calculating the uplift bearing capacity of pile foundation with multiple expanded heads was proposed， and its bearing capacity and economy were compared with the traditional pile foundation.
Result The results we obtained demonstrate that with the same bearing capacity， the multiple heads foundation saves 4% ~ 26% of concrete compared with the single head foundation， and increases with the increase of the ratio of depth to diameter.
Conclusion Our data suggest that using the multiple heads foundation in large-scale transmission lines can greatly improve the uplift bearing capacity of the foundation and save the concrete. In the same condition， the uplift capacity of multiple heads foundation improves 9%~34% comparing to the single head foundation.
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