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Technical University of Munich

Geoplastics - Building on soft ground

Contact:: Prof. Dr.-Ing. E.h. R. Floss
  Dipl.-Ing. Gerhard Bräu

Substrate Improvement - Vertical Drain / Reinforcement

  • Acceleration of consolidation
  • Increased stability

Reinforced steep slope under direct traffic load

  • Protection of ecologically valuable areas
  • Flexible construction for adaptation to inhomogeneous, soft subsoil conditions

 

  • Metrological monitoring of a new construction (vertical/horizontal deformations, earth pressures)
  • Usability under extreme dynamic load

 

003-2005 Geoplastics - Building on soft ground:

  • Construction
    • 6 layers d = 0.5 m, Front tilt 80°
    • sandy gravel
    • steep slope 1 geogrid, PES Garne, PE casing; Tmax = 155 kN/m, Tcal =42 kN/m
    • steep slope 2 Geokomposit, PP Garne, PP non-woven fabric; Tmax =227 kN/m, Tcal =36 kN/m
    • Safety factor for standard calculation η = 1.4
  • Experience during operation under direct heavy goods traffic
    • Vertical deformations of the entire construction (30 - 50 cm)
  • proof load
    • 6 anchors, each 15 m long
    • loading area 2.0 x 2.5 m
    • Measurements: Settlements, horizontal deformations, earth pressures
  • Results
    • Horizontal deformations < 1.5 - 2.0 mm at σ = 600 kPa
    • Test load (limited by anchor load 20 - 25 times higher than calculated
    • No fracture condition to be achieved --> load-bearing behaviour considerations required

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