Abstract
The Ljubljana-Postojna highway crosses the northern boundary part of the Ljubljana marsh. Due to high compressibility of the upper peaty, silty and clayey layers of the subsoil with total thickness of about 12 M settlements up to 160 cm were expected. In order to reduce the post-construction settlements to tolerable values, vertical wick drains, preloading, light fill material and partially the excavation of superficial peat were used. The applicability of simplified consolidation and stability analyses was checked by observations on a test embankment and the efficacy of polypropylene covers of wick drains by laboratory and field tests. Settlements observed during the construction of the highway and two years afterwards agree satisfactorily with forecast values. (TRRL)
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