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Hybrid Geosynthetic Solution for Rail Track on Expansive Clay
Large areas around the globe consist of expansive weak clay subgrades. The subgrade volume of these clays change as a result of seasonal changes in moisture content. In unpaved rail track pavement structures swelling causes severe degradation of rail alignment leading to extensive maintenance efforts. One method to deal with this phenomenon is to create horizontal and vertical moisture barriers. Local experience in Israel however, indicates that only partial restraint of swell damages can be achieved by such barriers. The Israeli Rail Authority has recently adopted and implemented a "Hybrid Geosynthetic Solution" that effectively restrains differential heave caused by uneven swelling of the clayey subgrade. The hybrid geosynthetic solution is comprised of a stiff biaxial geogrid located at the subgrade/pavement interface combined with a stiff geocell layer embedded in the unbound sub-ballast granular layer. The geocell material is made of novel polymeric alloy (NPA) capable of sustaining large hoop stresses with relatively small strains.
Hybrid Geosynthetic Solution for Rail Track on Expansive Clay
Large areas around the globe consist of expansive weak clay subgrades. The subgrade volume of these clays change as a result of seasonal changes in moisture content. In unpaved rail track pavement structures swelling causes severe degradation of rail alignment leading to extensive maintenance efforts. One method to deal with this phenomenon is to create horizontal and vertical moisture barriers. Local experience in Israel however, indicates that only partial restraint of swell damages can be achieved by such barriers. The Israeli Rail Authority has recently adopted and implemented a "Hybrid Geosynthetic Solution" that effectively restrains differential heave caused by uneven swelling of the clayey subgrade. The hybrid geosynthetic solution is comprised of a stiff biaxial geogrid located at the subgrade/pavement interface combined with a stiff geocell layer embedded in the unbound sub-ballast granular layer. The geocell material is made of novel polymeric alloy (NPA) capable of sustaining large hoop stresses with relatively small strains.
Hybrid Geosynthetic Solution for Rail Track on Expansive Clay
Kief, Ofer (author)
2015
11 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
Case History of a Geosynthetic-Stabilized Base Roadway Founded over Expansive Clay Subgrade
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