Abstract
Geosynthetics have increasingly been used as reinforcement in permanent earth structures, such as road and railway embankments, steep slopes, retaining walls and bridge abutments. The understanding of soil-geosynthetic interaction is of primary importance for the safe design of geosynthetic-reinforced soil structures, such as those included in transportation infrastructure projects. In this study, the pullout behaviour of three different geosynthetics (geogrid, geocomposite reinforcement and geotextile) embedded in a locally available granite residual soil is assessed through a series of large-scale pullout tests involving different soil moisture and density conditions. Test results show that soil density is a key factor that affects the reinforcement pullout resistance and the failure mode at the interface, regardless of geosynthetic type or soil moisture content. The soil moisture condition may considerably influence the pullout response of the geosynthetics, particularly when the soil is in medium dense state. The geogrid exhibited higher peak pullout resistance than the remaining geosynthetics, which is associated with the significant contribution of the passive resistance mobilised against the geogrid transverse members to the overall pullout capacity of the reinforcement.
Highlights
IntroductionGeosynthetics have been widely used as a reinforcement material in several geotechnical engineering applications, such as roadway and railway layers and embankments (Wu et al, 1992; Ashmawy and Bourdeau, 1995; Lee and Wu, 2004; Ravi et al, 2014; Ferreira et al, 2016a; Nimbalkar and Indraratna, 2016; Indraratna et al, 2018, 2019; Ngo et al, 2018; Byun and Tutumluer, 2019; Tatsuoka, 2019)
This paper extends previous work on the pullout response of geosynthetics embedded in granite residual soil presented in Ferreira et al (2016b)
The pullout behavior of three different geosynthetics embedded in a locally-available granite residual soil was assessed through a series of large-scale pullout tests involving different soil moisture and density conditions
Summary
Geosynthetics have been widely used as a reinforcement material in several geotechnical engineering applications, such as roadway and railway layers and embankments (Wu et al, 1992; Ashmawy and Bourdeau, 1995; Lee and Wu, 2004; Ravi et al, 2014; Ferreira et al, 2016a; Nimbalkar and Indraratna, 2016; Indraratna et al, 2018, 2019; Ngo et al, 2018; Byun and Tutumluer, 2019; Tatsuoka, 2019) In such applications, the interaction mechanism between the geosynthetic and the surrounding material is of primary importance. For geotextiles (with continuous surface), only the frictional resistance contributes to the overall pullout capacity
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