Geotextiles and Geogrids

 

Over the last two decades, soil-geosynthetic interaction has been investigated both experimentally in small and large- scale tests as well as numerically using FEM and DEM methods. The objective of this research is to gain detailed understanding of the complex compound behaviour of reinforced soil.

  Compound testing in pullout (left) and direct shear (right) box Copyright: © GUT RWTH Compound testing in pullout (left) and direct shear (right) box
  • Direct shear and pullout testing

In the Institute of Geomechanics and Underground Technology (GUT) laboratory, we carry out standard tests to quantify the compound behaviour of geosynthetics with the surrounding soil in both modes of action direct shear and pullout. Any possible combination of geotextile/geomembrane and soil can be tested in a wide range of boundary conditions.

Past and current projects

  • Investigation of the pull-out behaviour of geogrids
  • determination of direct shear and pullout strength

Publications.
(Jacobs, 2016; Ziegler & Timmer, 2003; Jacobs et al., 2016)

  Triaxial (left) and biaxial (middle) testing, geogrid in transparent soil (right) Copyright: © GUT RWTH Triaxial (left) and biaxial (middle) testing, geogrid in transparent soil (right)
  • Soil-geogrid interaction

The beneficial effects of geosynthetic-reinforced soil have been demonstrated macroscopically by the stress-strain behaviour in large-scale triaxial and biaxial tests. Recently, a new testing apparatus was designed using transparent soil that allows an unobstructed observation of the interface to investigate the load transfer mechanisms at particle level.

Past and current projects

  • Fundamental investigation and characterisation of the stress-strain behaviour of the composite material "geogrid-reinforced soil"
  • evaluation of load transfer using transparent soil

Publications
(Jacobs & Ziegler, 2015; Ruiken, 2013 Ziegler & Ruiken, 2009; Derksen & Ziegler, 2020)

  Contact force and tensile force distributions in (un-)reinforced slope using DEM (left), model test of geogrid-reinforced soil structure (right) Copyright: © GUT RWTH Contact force and tensile force distributions in (un-)reinforced slope using DEM (left), model test of geogrid-reinforced soil structure (right)
  • Reinforced structures

In numerical and experimental studies, the interaction of reinforced soil itself and as an overall structure with the subsoil and backfill is investigated. These investigations are used to optimise the design, validate and improve analytical and numerical approaches.

Past and current projects

  • Investigations of the bearing capacity failure of geogrid-reinforced soil walls
  • Discrete element modelling of geogrid reinforced soil

Publications
(Wang et al., 2016; Ziegler, 2017; Derksen et al., 2017)