An Improvement of Bearing Capacity of Cement Mixing Pile Composite Foundation Considering Pile length

DOI

10.2991/978-94-6463-726-7_68How to use a DOI?

Keywords

road engineering; calculation improvement; theoretical analysis; cement mixing pile length; composite foundation; coefficient of soil bearing capacity between piles

Abstract

In view of the problem that the bearing capacity of cement mixing pile composite foundation is lower than that of undisturbed soil in the current code when the pile length is small. There are few theoretical or design studies on this issue in the existing literature. Using the theoretical analysis method, the main problems of the design calculation of cement mixing pile composite foundation in current codes are explained first. Based on the existing test results, the correlation between pile length and the bearing capacity of composite foundation and the coefficient β of soil bearing capacity between piles are analyzed. Combined with the pile length approaching 0m, two simple calculation methods of β are proposed. Finally, the rationality of each method is then analyzed based on actual engineering. The results show that β is equal to 1 when the pile length is 0m. When the pile length tends to 0m, β is slightly greater than 1, and it is only related to the displacement ratio and the exerting coefficient of pile tip resistance. Two methods for determining β with pile length are proposed. In case 1, there are declining, rising and stable sections for β with pile length. And in case 2, there are only decreasing and stable sections for β with pile length. The first case is more consistent with the reality, and can well deal with the situation of short pile length, such as the design and calculation of the bearing capacity of composite foundation when the bottom of the pit is strengthened. The research results have improved the bearing capacity theory of composite foundation with short length of cement mixed pile in current codes.

Copyright

© 2025 The Author(s)

Open Access

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TY  - CONF
AU  - Zhanjun Huang
AU  - Xiangdong Sun
AU  - Zuoyue He
AU  - Dongjin Xu
AU  - Hanhao Zhang
PY  - 2025
DA  - 2025/06/13
TI  - An Improvement of Bearing Capacity of Cement Mixing Pile Composite Foundation Considering Pile length
BT  - Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
PB  - Atlantis Press
SP  - 676
EP  - 687
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-726-7_68
DO  - 10.2991/978-94-6463-726-7_68
ID  - Huang2025
ER  -