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Effect of geotextile ageing and geomembrane surface roughness on the geomembrane-geotextile interfaces for heap leaching applications
Abstract A series of large scale direct shear experiments is used to investigate the effect of the geomembrane (GMB) surface roughness, geotextile (GTX) properties, and GTX ageing, on the GMB-GTX interface shear behaviour. Interfaces involving smooth, coextruded textured, and structured surface GMBs underlying four different nonwoven needle-punched staple fibres (GTXs) with mass per unit areas between 200 and 2400 g/m2, and a geocomposite drain (GCD) are examined at normal stresses between 250 and 1000 kPa. The results showed that the interlocking between the GMB and GTX increased with increasing the GMB asperity height and/or decreasing the mass per unit area of the GTX. For the interfaces that involved GTXs preaged prior to the shear box experiments for up to 2 years at 85 °C, it was found that the 2400 g/m2 heat bonded two-layered GTX exhibited internal shear failure at low shear displacements. However, all the highly aged single layered GTXs showed an increase in the peak interface friction angles with the increase in their ageing. For these single layered GTX, the results suggest that assessing the interface friction angles using unaged GTXs for the stability analysis is conservative as long as the GTX remains intact in the field.
Highlights Under normal stresses up to 1000 kPa, no surface damage was observed in any of the geomembranes surface roughness. Decreasing the geotextile mass per unit area, increased the friction angles for the geomembrane-geotextile interface. Ageing of single-layer geotextiles resulted in an increase in peak interface friction angle. Geotextile ageing resulted in higher post peak strength. Preaged heat bonded two-layer geotextile exhibited internal failure at the interface between the two layers of the geotextile.
Effect of geotextile ageing and geomembrane surface roughness on the geomembrane-geotextile interfaces for heap leaching applications
Abstract A series of large scale direct shear experiments is used to investigate the effect of the geomembrane (GMB) surface roughness, geotextile (GTX) properties, and GTX ageing, on the GMB-GTX interface shear behaviour. Interfaces involving smooth, coextruded textured, and structured surface GMBs underlying four different nonwoven needle-punched staple fibres (GTXs) with mass per unit areas between 200 and 2400 g/m2, and a geocomposite drain (GCD) are examined at normal stresses between 250 and 1000 kPa. The results showed that the interlocking between the GMB and GTX increased with increasing the GMB asperity height and/or decreasing the mass per unit area of the GTX. For the interfaces that involved GTXs preaged prior to the shear box experiments for up to 2 years at 85 °C, it was found that the 2400 g/m2 heat bonded two-layered GTX exhibited internal shear failure at low shear displacements. However, all the highly aged single layered GTXs showed an increase in the peak interface friction angles with the increase in their ageing. For these single layered GTX, the results suggest that assessing the interface friction angles using unaged GTXs for the stability analysis is conservative as long as the GTX remains intact in the field.
Highlights Under normal stresses up to 1000 kPa, no surface damage was observed in any of the geomembranes surface roughness. Decreasing the geotextile mass per unit area, increased the friction angles for the geomembrane-geotextile interface. Ageing of single-layer geotextiles resulted in an increase in peak interface friction angle. Geotextile ageing resulted in higher post peak strength. Preaged heat bonded two-layer geotextile exhibited internal failure at the interface between the two layers of the geotextile.
Effect of geotextile ageing and geomembrane surface roughness on the geomembrane-geotextile interfaces for heap leaching applications
Abdelaal, F.B. (author) / Solanki, R. (author)
Geotextiles and Geomembranes ; 50 ; 55-68
2021-09-14
14 pages
Article (Journal)
Electronic Resource
English
Shear Strength between Soil/Geomembrane and Geotextile/Geomembrane Interfaces
| British Library Conference Proceedings | 2014