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Numerical Analysis of Piled Raft Foundations Designed for Settlement Control on Steel Grain Silos in Collapsible Soils

Abstract

The present article assesses the potential use of piled raft foundations for settlement control in grain silos, by performing numerical analyses with instrumented structures built in a particular city of the Mato Grosso state, deep in the Brazilian agricultural frontier. In this city, eight steel grain silos were constructed, and settlements were topographically monitored. The silos were numerically back analyzed using a finite-element-based hybrid numerical tool to verify interactions influence between the isolated (unpiled) foundation rafts during the grain storage season. A parametric analysis was subsequently carried out to verify the potential use of piled rafts to decrease settlement, as well as to improve design in terms of a better configuration concerning the use of compacted soil layers beneath the raft, raft thickness and pile length, and disposition within the foundation system. The numerical analyses indicated the use of a piled raft arrangement with a geometric factor equals to 0.09 as a proposed optimized solution aiming to minimize differential and total settlements. From this arrangement onwards, changes in pile spacing, pile diameter or in the number of piles, leading to higher geometric factors, were not able to provide significant settlement reductions. The increase in raft thickness and the use of compacted soil layers do not contribute to major improvements in the foundation settlement. The alternative optimized solution was able to ensure the serviceability and safety requirements of the silos, which can serve as a design benchmark.

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Acknowledgements

The authors thank the University of Brasilia, in particular the Geotechnical Postgraduate Program for the support and infrastructure that allowed the elaboration of this research. A special attention should be given to the dear professor J.H.F. Pereira (in memory) for some ideas and discussions related to the research on tropical soils of the Brazilian Mid-West region. It should also be acknowledged the support given by the engineer M.Sc. José Antônio de Abreu and the engineering company EMBRE Engenharia LTDA for all foundation related research, especially to Dr. Carlos Medeiros. Also to the Brazilian sponsorship organizations CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the financial aid to our scholarships. This work is another product from the research group on foundations, in situ testing and retaining structures (www.rpcunha.wixsite.com/gpfees).

Funding

The Brazilian sponsorship organizations CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).

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Correspondence to Renato Pinto da Cunha.

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Availability of Data and Material

The data that support this study are available in https://repositorio.unb.br/handle/10482/34449 (M.Sc. Thesis).

Code/Software Availability

The software was available by the last author (Prof. Renato Pinto da Cunha, Ph.D.), whose access was granted during his post-doctorate period in The University of Sidney, in 1999, with the Prof. Harry G. Poulos.

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Bernardes, H.C., de Souza Filho, H.L., Dias, A.D. et al. Numerical Analysis of Piled Raft Foundations Designed for Settlement Control on Steel Grain Silos in Collapsible Soils. Int J Civ Eng 19, 607–622 (2021). https://doi.org/10.1007/s40999-020-00586-5

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Keywords

  • Piled raft
  • Grain silos
  • Numerical modeling
  • Foundation design
  • Collapsible soils
  • Settlement