Improved PID control for triaxial testing liquefied specimen

Tomas Sabaliauskas, Lars Bo Ibsen

Research output: Book/ReportReportResearch

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Using a frictionless triaxial apparatus, sand specimens can be tested at relatively high axial strains, even while liquefying. However, liquefying specimens have extremely nonlinear stiffness, thus standard PID control does not perform well. To maintain control over applied loads, the PID controller was modified to adapt to disturbed soil states. The proposed methods expand the scope of testing towards options which are otherwise inaccessible by triaxial testing.
Original languageEnglish
Place of PublicationAalborg
PublisherDepartment of Civil Engineering, Aalborg University
Number of pages11
Publication statusPublished - 2017
SeriesDCE Technical reports


  • Triaxial apparatus
  • Sand behavior
  • Liquefaction
  • Strain space


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