Table 1.3. Values of soil friction angle, interface friction angle, friction efficiency and interaction coefficient reported in the literature. Soil Type Reinforcement type Soil internal Interface friction E Ci References angle () friction angle () 37.5 35.3 0.92 0.92 Sand Woven geotextile (PP) et al. (2011) 37.5 37.0 0.98 0.93 Geogrid (PET) 34.6 33.8 0.97 0.43 Uniaxial geogrid Nejad et al. (2012) 38.4 26.9 0.64 0.42 Woven geotextile (PP) Hsieh et al. (2011) Gravel 38.4 38.6 1.01 0.88 Geogrid (PET) 45.8 44.4 0.95 0.71 Geogrid uniaxial Nejad et al. (2012) 55.0 30.6 0.41 0.36 Crushed stone geotextile (PP) et al. (2011) 55.0 43.3 0.66 0.58 Geogrid (PET) 65.0 50.0 0.55 - RCA Biaxial geogrid (PP) Arulrajah et al. (2013) 45.0 40.5 0.71 - RAP Biaxial geogrid (PP) Arulrajah et al. (2013) 43.0 29.0 0.60 0.32 FDS Woven geotextile (PP) Goodhue et al. (2001) 31.0 29.0 0.90 0.26 geotextile (PP) 44.0 31.0 0.60 - Uniaxial geogrid (PET) 31.0 26.0 0.80 0.44 Uniaxial geogrid (PET)
Table 1.3. Values of soil friction angle, interface friction angle, friction efficiency and interaction coefficient reported in the literature. Soil Type Reinforcement type Soil internal friction angle () Interface friction angle () E Ci References Sand Woven geotextile (PP) 37.5 35.3 0.92 0.92 et al. (2011) Geogrid (PET) 37.5 37.0 0.98 0.93 Uniaxial geogrid 34.6 33.8 0.97 0.43 Nejad et al. (2012) Gravel Woven geotextile (PP) 38.4 26.9 0.64 0.42 Hsieh et al. (2011) Geogrid (PET) 38.4 38.6 1.01 0.88 Geogrid uniaxial 45.8 44.4 0.95 0.71 Nejad et al. (2012) Crushed stone geotextile (PP) 55.0 30.6 0.41 0.36 et al. (2011) Geogrid (PET) 55.0 43.3 0.66 0.58 RCA Biaxial geogrid (PP) 65.0 50.0 0.55 - Arulrajah et al. (2013) RAP Biaxial geogrid (PP) 45.0 40.5 0.71 - Arulrajah et al. (2013) FDS Woven geotextile (PP) 43.0 29.0 0.60 0.32 Goodhue et al. (2001) geotextile (PP) 31.0 29.0 0.90 0.26 Uniaxial geogrid (PET) 44.0 31.0 0.60 - Uniaxial geogrid (PET) 31.0 26.0 0.80 0.44
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