Abstract
Stabilisation is defined as improvement of the mechanical properties of an unbound granular material by including one or more geosynthetic layers such that the deformation under applied loads is reduced by minimizing soil particle movement. Paper discuss geogrids as type of geosynthetics which when used in stabilisation function for transport applications could provide real improvement in performance of aggregate layer. Such function has been called for a quite long time as the reinforcement of subbase, base or ballast, depending on the application
Highlights
Stabilisation / stiffening is a mechanism leading to reduction of particle movement achieved through confinement
Stabilisation as function of geosynthetic was recently newly formally defined by ISO TC221 as “Improvement of the mechanical properties of an unbound granular material by including one or more geosynthetic layers such that the deformation under applied load is reduced by minimizing soil particle movement”
The function has been called for quite a long time as the reinforcement of subbase, base or ballast according to the application (Giroud and Han; 2016; Rakowski, 2017)
Summary
Stabilisation / stiffening is a mechanism leading to reduction of particle movement achieved through confinement It is very important in geotechnical engineering as tool to improve compaction (Kumor and Kumor, 2016; Zabielska-Adamska and Sulewska, 2013) or reduce vibrations (Rybak and Pieczynska-Kozlowska, 2014). There is a number of researchers and Engineers who are actively involved in various research and applications with use of geosynthetics for stabilization (Grygierek, 2017; Robinson et al 2018; Sun et al 2015; Tutumluer et al, 2012; Oliver et al 2016) The mechanism of aggregate stabilisation under dynamic load from train is achieved thanks to grain interlocking within non–deformable aperture of the stiff geogrid (see Figure 1). When a trafficking load is applied to a layer, the stiff ribs of the geogrid react, preventing aggregate particles from moving laterally This increases the horizontal principal stresses, and , and increases as a result. It’s important to remember that to achieve proper stabilization effect we need a right drainage, if this is a not possible via natural formations proper geosynthetics for drainage could be used (Miszkowska et al, 2017)
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