Settlement Prediction of a Group of Lightweight Aggregate (LECA) Columns Using Finite Element Modelling

  • Authors

    • Azhani Zukri
    • Ramli Nazir
    • Ng Kok Shien
    2018-11-30
    https://doi.org/10.14419/ijet.v7i4.35.22324
  • Expanded Clay Aggregate, Settlement, Stone column, Finite element, Soft Soil improvement

  • Abstract

    The method of reinforcing the soft clays with stone columns is the most commonly adopted technique to enhance its load carrying capacity and to reduce settlements. Their performance with respect to bearing capacity is well researched, but the understanding of settlement characteristics still requires extensive investigations. Moreover, no studies have been made to explore the effectiveness of stone columns using Lightweight Expanded Clay Aggregate (LECA) as filler material replacing normal stone/aggregates in order to improve settlement behavior of soft clay. LECA is known as a common lightweight material that have been applied successfully in civil engineering works where weight is an issue because the materials can help to reduce dead loads and lateral forces by more than half in installations over structures and those with soft soils. The purpose of this work is to assess the suitability of reinforcing technique by LECA columns to improve the settlement through finite element. The analysis of performance of LECA column in soft soil improvement was conducted through finite elements methods by using Plaxis 3D commercial software. Based on the results the settlement ratio was reduced as the column length increased until unity at end bearing condition where β=1.0. It is also observed that bulging was reduced with closer spacing between LECA columns.

  • References

    1. [1] Hughes J M O W N J 1974 Reinforcing of soft cohesive soils with stone columns Ground Engineering 7 42–9

      [2] R. D. Barksdale R C B 1983 Design and Construction of Stone Columns (Washington, DC)

      [3] Aljanabi Q A, Chik Z and Kasa A 2013 Construction of a new highway embankment on the soft clay soil treatment by stone columns in Malaysia Journal of Engineering Science and Technology 8 448--456

      [4] Raju V R, Wegner R . and Krishna Y H 2004 Ground Improvement using Vibro Replacement in ASIA 1994 to 2004. A 10 year review 5th International Conference on Ground Improvement Techniques

      [5] Spears D S 2014 Soil Improvement Using Vibro-Replacement Aquila: The FGCU Student Journal 1 1–5

      [6] Holm T A and Valsangkar A J 1993 Lightweight Aggregate Soil mechanics: Properties and Applications (Transportation Research Record)

      [7] Zukri A and Nazir R 2018 The Sustainable Materials Used As Stone Column Filler: A Short Review iCITES2018

      [8] Greenwood D A 1970 Mechanical Improvement Of Soils Below Ground Surface Ground Engineering Conference, Institution Of Civil Engineers (London: ICE Publishing) pp 11–22

      [9] Mohammadreza Jaberi Nasab A A 2015 Numerical Analysis of the Bearing Capacity of Stone Columns Impoved Ground International Journal of integrative Sciences, Innovation and Technology 4 1–5

      [10] Hughes Withers N J J M O 1974 Reinforcing of soft cohesive soils with stone columns Ground Engineering 7 42–9

      [11] Goughnour R R and Barksdale R D 1984 Performance of a Stone Column Supported Embankment International Conference on Case Histories in Geotechnical Engineering. pp 735–42

      [12] N.P.Balaam J R B 1981 Analysis of rigid rafts supported by granular piles International Journal for Numerical and Analytical Methods in Geomechanics 5 379–403.

      [13] S L J and N P G 1998 Analysis of stoneâ€column reinforced foundations International Journal for Numerical and Analytical Methods in Geomechanics 22 1001–20

      [14] Hu W 1995 Physical modelling of group behaviour of stone column foundations

      [15] Wood D M, Hu W and Nash D F T 2000 Group effects in stone column foundations: model tests Géotechnique 50 689–98

      [16] Oh E Y N, Huang M, Surarak C, Adamec R and Balasurbamaniam a S 2008 Finite Element Modeling for Piled Raft Foundation in Sand Engineering & Construction 1–8

      [17] Hanna A, Ayadat T, Etezad M and Cros C 2016 Settlement of A Group Of Stone Columns In Soft Soil Science des matériaux (Laboratoire LARHYSS) 7

      [18] Ng K S and S.A.Tan 2014 Floating Stone Columns Design and Analyses Soils and Foundations 54 478–487

      [19] Ng K S 2017 Settlement Ratio of Floating Stone Columns for Small And Large Loaded Areas Journal of GeoEngineering 12 89–96

      [20] Kok Shien Ng S A T 2014 Floating Stone Columns Design and Analyses Soils and Foundations -Tokyo 1–27

      [21] Law S 2015 Numerical Modelling of the behaviour of stone and composite stone columns in soft soils (Heriot-Watt University)

      [22] Priebe H J 1995 The Design of Vibro Replacement

      [23] Han J 2015 Principles and Practice of Ground Improvement (John Wiley & Sons, Inc. Hoboken, New Jersey)

      [24] John M. Pitt, David J. White, Aaron Gaul K H 2003 Highway application for rammed aggregate piles in Iowa soils

      [25] Murugesan S and Rajagopal K 2006 Geosynthetic-encased stone columns: Numerical evaluation Geotextiles and Geomembranes 24 349–58

      [26] McKelvey D, Sivakumar V, Bell A and Graham J 2004 Modelling vibrated stone columns in soft clay Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 157 137–49

      [27] Srilekha Y and Nirisha S 2016 An Experimental Investigation on the Load Settlement and the Bulging Behaviour of Stone Columns Placed on Highly Plastic Clays Indian Journal of Science and Technology 9

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  • How to Cite

    Zukri, A., Nazir, R., & Shien, N. K. (2018). Settlement Prediction of a Group of Lightweight Aggregate (LECA) Columns Using Finite Element Modelling. International Journal of Engineering & Technology, 7(4.35), 59-65. https://doi.org/10.14419/ijet.v7i4.35.22324

    Received date: 2018-11-29

    Accepted date: 2018-11-29

    Published date: 2018-11-30