ESTIMATING THE INTERNAL FORCES OF RAFT IN PILED RAFT FOUNDATION FOR NORMAL AND GROUNDWATER PUMPING CONDITIONS: A CASE STUDY SOC TRANG PROVINCE, VIETNAM

Hiep Van Huynh; Tri Huu Huynh; Truyen Gia Ngo; Tuan Van Tran

doi:10.35382/18594816.1.42.2021.695

Hiep Van Huynh School of Engineering and Technology, Tra Vinh University
Tri Huu Huynh School of Engineering and Technology, Tra Vinh University
Truyen Gia Ngo School of Engineering and Technology, Tra Vinh University
Tuan Van Tran Can Tho University

DOI: https://doi.org/10.35382/18594816.1.42.2021.695

Keywords: groundwater pumping, internal forces, piled raft, Poulos method

Abstract

Piled raft foundations are widely used in infrastructure built on soft soil to reduce the settlement and enhance bearing capacity. The raft can be used for basements and to share the load. In this paper, Poulos method, in which the raft was cut into many piled strips, was used as an analytical method. The study also used Plaxis
2D and SAP 2000 to calculate internal forces for the raft in a piled raft foundation. A case of Vietcombank building with 10 floors and 1 basement, constructed on a soil profile in Soc Trang province, was studied. The piled raft with a 35m×19m×1m (length×width×thickness) raft and 28 piles were used for the analysis. Normal
and groundwater pumping conditions were applied for the soil. The results showed that the maximum moment and shear force that occurred in the raft were affected when the groundwater pumping condition was applied to the model. The internal forces of the raft in the piled raft foundation for different conditions were captured,
discussed, and presented in this paper.

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