Module 5: Ground improvement of soils prone to liquefaction

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About this document

  • Published on 29 November 2021
  • Updated on 29 November 2021
  • Of interest to Building consent authorities, Engineers,
  • ISBN: 978-1-98-851736-0 (Print) / 978-1-98-851735-3 (Online)


Module 5 of the Earthquake Geotechnical Engineering Practice guidelines covers the principles of the design of ground improvement, up-to-date practice and supports the Canterbury Earthquakes Royal Commission recommendations.


Developed jointly by MBIE and the New Zealand Geotechnical Society, Module 5 is part of the Earthquake Geotechnical Engineering Practice series and relates specifically to ground improvement of soils prone to liquefaction.

High level changes in this version include

  • Updates and Additions to
    • Section 3: Ground improvement principles to outline the effects of ground improvement on neighbouring sites
    • Section 5: Ground improvement design information added on the torsional response of structures on partially improved ground and groundwater flows associated with liquefaction
    • Section 7: Densification methods - outlining the effect of hard surface layer of effectiveness of dynamic compaction
    • Section 8 : Solidification methods - a flowchart for design and construction of Deep Mixing projects has been incorporated
    • Section 11: Ground improvement for residential construction - The Earthquake Commission’s ground improvement trial findings have been incorporated.
  • Minor content revisions, clarifications and updates, including consideration and incorporation of relevant existing feedback
  • References updated to include more detailed design manuals & guidelines.

Appendix includes six worked examples.

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: