Effectiveness of a vertical micropile system in mitigating the liquefaction-induced lateral spreading effects on pile foundations: 1 g large-scale shake table tests

Document Type : Article

Authors

1 School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran

2 Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

Abstract

Liquefaction-induced lateral spreading has caused severe damages to pile foundations during past earthquakes. Micropiles can be used as a mitigation strategy against lateral spreading effects on pile foundations. However, the available knowledge regarding the possible efficiency of such a strategy is quite limited. In this paper, the effectiveness of a vertical micropile system as a lateral spreading countermeasure was evaluated using large scale 1g shake table tests on 3×3 pile groups. The results showed that the micropile system was not able to effectively reduce bending moments in piles while it reduced lateral soil pressures exerted on the upslope piles of the group by the upper non-liquefiable layer. The employed micropiles restricted lateral displacement of the upper non-liquefiable layer and partially that of the liquefiable layer, especially at upper depths. Solutions such as increasing the number of micropiles with a tighter pattern, using stiffer micropiles or fixing them in the underlying non-liquefiable layer can enhance their performance.

Keywords


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Volume 29, Issue 3
Transactions on Civil Engineering (A)
May and June 2022
Pages 1038-1058
  • Receive Date: 04 September 2020
  • Revise Date: 19 July 2021
  • Accept Date: 25 October 2021