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ICSE 6 6 th International Conference on Scour and Erosion, Paris Aug. 27-31 2012 Water-Soil Interaction Simulation using Smoothed Particle Hydrodynamics Bozhana STEFANOVA, Karlotta SEITZ, Julian BUBEL, Jrgen GRABE Hamburg University of

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Water-Soil Interaction Simulation using Smoothed Particle Hydrodynamics

Bozhana STEFANOVA, Karlotta SEITZ, Julian BUBEL, Jürgen GRABE

Hamburg University of Technology Institute of Geotechnical Engineering and Construction Management

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Introduction

  • Gravity base

foundation for an

  • ffshore wind energy

converter:

– hollow structures made of concrete – manufactured onshore and transported to the construction site – lowered into a prepared foundation pit

  • Jet grouting:

– used since the 1970´s – method of ground improvement and stabilization – high presure streams to break up the soil

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Introduction

  • Gravity base

foundation for an

  • ffshore wind energy

converter:

– hollow structures made of concrete – manufactured onshore and transported to the construction site – lowered into a prepared foundation pit

  • Jet grouting:

– used since the 1970´s – method of ground improvement and stabilization – high presure streams to break up the soil

interaction between fluid and soil

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Lowering of a gravity base foundation (GBF)

water flow underneath the foundation is induced: → flow in the voids of the soil → erosion

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Soil interaction with a fluid jet

  • high velocity and

pressure

  • different stages of

interaction

  • reduction of

effective stress in the soil

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Smoothed Particle Hydrodynamics (SPH)

  • meshfree method
  • uses particles that have

the properties of the material

  • riginally applied in the

1970`s in the astrophysics

  • nowadays used for

different physical, hydrodynamic and also geotechnical calculations

  • approximation for each

particle using its neighbors

(fig. after Colagrossi, 2003)

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Conservation equations in SPH

mass conservation momentum conservation

equation of state

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Implementation in SPH

  • soil as a viscous fluid, using Gadget H2O by C. Ulrich &
  • T. Rung

– viscosity μ as function of the angle of friction φ, cohesion c, pressure p and deviatoric strain rate ė: – useful approach to study the applicability and feasibility of the models – for further geotechnical applications: more sophisticated treatment of soil needed

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Simulation of the lowering of a gravity base foundation

STRABAG Gravity Base (Weber, 2010) Model setup

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Results for lowering of a gravity base foundation

velocity magnitude [m/s]

initial configuration 5 s 15 s

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Results for jet grouting

0.015s 0.03s velocities particles

[m/s]

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ICSE 6 – 6th International Conference on Scour and Erosion, Paris Aug. 27-31 2012

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Results for jet grouting

0.015s 0.03s velocities particles

[m/s]

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

Conclusions & outlook

  • soil-water interaction for two geotechnical problems

was analyzed

  • promising results
  • future goals

– two-phase-model in order to describe the soil-fluid- interaction – test cases for numerical analysis & variation of parameters – calibration and validation of the simulation results

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Water –Soil Interaction Simulation using SPH - Stefanova, Seitz, Bubel, Grabe

THANK YOU FOR YOUR ATTENTION!