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Influence of geotextile encasement on the behaviour of stone columns: Laboratory study

  This paper presents a study of the influence of the geotextile encasement on the behaviour of soft soils improved with fully penetrating encased columns. This influence is analysed by means of measuring soil-column stress distribution, pore pressures and soil deformation during the consolidation process. For this purpose, a horizontal slice of a representative “unit cell” has been analysed by means of small-scale laboratory tests. The tests were carried out in a large instrumented Rowe-Barden oedometric cell. Results showed that the vertical stress supported by encased columns is about 1.7 times that sustained by the non-encased ones. The stress concentration factor for encased columns is between 11 and 25, which is clearly higher than that obtained in tests with non-encased columns, which are between 3 and 6. Finally, the improvement in relation to settlements is presented by the ratio of settlement in soils reinforced with ordinary or encased columns and the settlement of non-treated soft soil. This settlement reduction factor is around 0.6 when the soil is treated with encased columns and 0.8 for soil with non-encased columns.

  • Type:

    Article

  • Date:

    22 September 2016

  • Publication Status:

    Published

  • Publisher

    Elsevier BV

  • DOI:

    10.1016/j.geotexmem.2016.08.004

  • Cross Ref:

    S0266114416301029

  • ISSN:

    0266-1144

  • Library of Congress:

    TA Engineering (General). Civil engineering (General)

  • Dewey Decimal Classification:

    624 Civil engineering

  • Funders:

    Ministerio de Ciencia e Innovación

Citation

Miranda, M., Da Costa, A., Castro, J. & Sagaseta, C. (2017). Influence of geotextile encasement on the behaviour of stone columns: Laboratory study. Geotextiles and Geomembranes. 45(1), 14-22. doi:10.1016/j.geotexmem.2016.08.004. ISSN 0266-1144

Authors

Keywords

Geosynthetics; Small-scale test; Soft soil; Settlement reduction; Stress concentration factor; Encased-columns

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