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Deformation performance of cement-fly ash-gravel pile-supported embankments over silty clay of medium compressibility: a case study

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Abstract

This paper presents a special case study on the performance of geosynthetics-reinforced and pile-supported embankments (GRPS) over silty clay of medium compressibility. A full-scale high-speed railway embankment with four instrumented subsections over medium silty clay was constructed in three stages. Three of the sections were reinforced by geosynthetics and cement-fly ash-gravel (CFG) piles with different configurations, while the other section was only reinforced by geosynthetics, which was used as a reference. The discussion mainly focused on the deformation behaviors of test embankments. The results show that (1) both the vertical settlements and the lateral displacements slightly increased until a certain fill height. Afterwards, they increased rapidly due to the transformation from the over-consolidated state to partly or entirely normally consolidated state of the foundation soil. (2) CFG pile reinforcement performed well in terms of reducing settlements and lateral displacements. (3) The lateral displacement is a useful indicator for evaluating external stability of GRPS embankments. Moreover, the comparison of soil stiffness obtained from in situ and laboratory suggests that an appropriate equivalent modulus may be obtained based on the stiffness-strain curve from a triaxial test with local strain measurements while considering the correct strain level obtained from field measurements of vertical settlements.

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Acknowledgments

The author would like to acknowledge the funding of the Technological Research and Development Programs of the Ministry of Railways (No. 2010G003-F) for supporting full scale embankment tests, and the financial support from the Chinese Scholarship Council within the China State-Funded Postgraduate Overseas Study Program. The fruitful discussions and constructive comments from Dr. Olivier Buzzi, Dr. George Kouretzis, and Dr. Daniel Bishop are also gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of High-speed Railway Engineering of Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Chonglei Zhang & Guanlu Jiang

  2. Priority Research Centre for Geotechnical and Materials Modelling, The University of Newcastle, Callaghan, NSW, 2308, Australia

    Chonglei Zhang & Xianfeng Liu

  3. China Railway Eryuan Engineering Group Co. Ltd., Chengdu, 610031, China

    Zhimeng Wang

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  1. Chonglei Zhang
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  2. Guanlu Jiang
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  3. Xianfeng Liu
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Correspondence to Guanlu Jiang.

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Zhang, C., Jiang, G., Liu, X. et al. Deformation performance of cement-fly ash-gravel pile-supported embankments over silty clay of medium compressibility: a case study. Arab J Geosci 8, 4495–4507 (2015). https://doi.org/10.1007/s12517-014-1559-8

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  • DOI: https://doi.org/10.1007/s12517-014-1559-8

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