Abstract
CPR grouting is a technique used to improve soft clayey soils through vertical drains and the injection of low mobility grout. CPR grouting still faces limited acceptance among certain practitioners, primarily due to the doubtful process of soil consolidation induced by grout injections. The aim of this study is to investigate the behavior of soft clays subjected to CPR grouting, attempting to enhance the theoretical understanding of the technique and evaluating the related consolidation process. The technique is studied using a special laboratory apparatus, in which a latex membrane is inflated within a soil specimen to simulate the grout injection. In this paper, we introduce the modified equipment, its components, describe the experimental procedure, outline the sample preparation, and present the experimental results. The key findings of this study suggest that injection pressure appears to be unrelated to the expanded volume, the peak injection pressure is similar across all tests, and larger injected volumes does not necessarily produce higher amount of soil consolidation. Although laboratory conditions are not identical to field conditions, laboratory tests indicate that grout injection does lead to consolidation in the soft clay, offering a valuable empirical guidance for a more cost-effective grouting design plan.
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The datasets generated during and/or analyzed during the current study are not publicly available due to as they are being used in the continuation of the doctoral studies of the corresponding author.
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Acknowledgements
The authors would like to acknowledge the UERJ, PUC-Rio and the ENGEGRAUT company, for the incentive and for making their laboratory available for this project. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001.
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This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by GFSMdA, AC and CAD. The coordination of the study were performed by BTL and ACCFS. The first draft of the manuscript was written by GFSMdA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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de Andrade, G.F.S.M., Dieguez, C.A., Cirone, A. et al. Laboratory Test for Efficient and Cost-Effective Design of CPR Grouting to Improve Soft Soils. Geotech Geol Eng 42, 2449–2458 (2024). https://doi.org/10.1007/s10706-023-02684-2
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DOI: https://doi.org/10.1007/s10706-023-02684-2