Modeling the hydraulic excavation of cohesive soil by a moving vertical jet

Boyao Wang, Cees van Rhee, Arno Nobel, Geert Keetels

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In dredging, high pressure water jets are commonly applied to assist the mobilization of soil. This work considers the excavation of cohesive soil. The key objective is to predict the development of the cavity in the soil as a function of the undrained shear strength, translation velocity and hydrodynamic pressure of a single nozzle. A generic computational fluid dynamics (CFD) model has been developed that captures both the jet flow and the soil failure in a single framework. The results are compared with data from a previous experimental study. The CFD model predicts the cavity dimensions with reasonable accuracy. In addition the model provides detailed data to study the cyclic nature of the soil failure process. The CFD model is promising and can be applied for more complex nozzle configurations to assist the design process of dragheads and improve production estimates.

Original languageEnglish
Article number108796
Number of pages13
JournalOcean Engineering
Volume227
DOIs
Publication statusPublished - 2021

Keywords

  • Cohesive soil
  • Computational fluid dynamics (CFD)
  • Dredging
  • Drift-flux model
  • Dynamic mesh
  • Moving jet
  • OpenFOAM
  • Undrained soil failure

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