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A platform for research: civil engineering, architecture and urbanism
Reinforced ballast behaviour subjected to repeated load
The paper presents a study of the effect of geosynthetic reinforcement on the (cumulative) plastic settlement, of a repeatedly loaded plane strain footing on a thin layer of granular aggregate overlying different compressible bases. Results were obtained using aggregate particles of both rounded and angular (freshly crushed) shapes. Past work has reported results using different geosynthetic reinforcement types, different ratios of footing width to reinforcement width and different reinforcement depths. Herein results for a surface footing, mainly 300 mm wide, placed on an unreinforced or geosynthetic reinforced aggregate are presented for a series of plane strain tests. Most tests were conducted on a 50 mm depth of aggregate that was placed on a 12.5 mm depth of compressible base. Three base types are used: rigid plus 12.5 mm of aggregate; 12.5 mm thick bare of equivalent elastic modulus (Em) of 4.40 MN/m2; and similarly 12.5 mm base of equivalent elastic modulus (Em) of 0.625 MN/m2. The repeated load was returned to zero at the end of each cycle that is typical of a vehicle loading on a track or pavement support. The results demonstrated the importance that the compressible bare and the reinforcement has an aggregate behaviour (settlement and breakdown). The practical significance to ballasted gantry crane and railway tracks is briefly discussed.
Reinforced ballast behaviour subjected to repeated load
The paper presents a study of the effect of geosynthetic reinforcement on the (cumulative) plastic settlement, of a repeatedly loaded plane strain footing on a thin layer of granular aggregate overlying different compressible bases. Results were obtained using aggregate particles of both rounded and angular (freshly crushed) shapes. Past work has reported results using different geosynthetic reinforcement types, different ratios of footing width to reinforcement width and different reinforcement depths. Herein results for a surface footing, mainly 300 mm wide, placed on an unreinforced or geosynthetic reinforced aggregate are presented for a series of plane strain tests. Most tests were conducted on a 50 mm depth of aggregate that was placed on a 12.5 mm depth of compressible base. Three base types are used: rigid plus 12.5 mm of aggregate; 12.5 mm thick bare of equivalent elastic modulus (Em) of 4.40 MN/m2; and similarly 12.5 mm base of equivalent elastic modulus (Em) of 0.625 MN/m2. The repeated load was returned to zero at the end of each cycle that is typical of a vehicle loading on a track or pavement support. The results demonstrated the importance that the compressible bare and the reinforcement has an aggregate behaviour (settlement and breakdown). The practical significance to ballasted gantry crane and railway tracks is briefly discussed.
Reinforced ballast behaviour subjected to repeated load
Verhalten von geotextil-verstärkten Gründungen unter periodischer Belastung
Raymond, G.P. (author)
Geotextiles and Geomembranes ; 20 ; 39-61
2002
23 Seiten, 19 Bilder, 2 Tabellen, 25 Quellen
Article (Journal)
English
Reinforced ballast behaviour subjected to repeated load
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