Construction of a Multi-Use Pathway on Soft Compressible Deposits– Case Study

Vasantha Wijeyakulasuriya, Ron Trewin, Ramon Miranda, Oliha Franklin

Dans les comptes rendus d’articles de la conférence: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Transportation Geotechnics

ABSTRACT: As part of a road upgrade of Victoria Street in the Town of Whitby, in the Regional Municipality of Durham, Ontario, a Multi-Use Pathway (MUP) was constructed in 2018. A section of the MUP about 150 m in length with embankments up to 3.5 m high, traversed the marshy flood plain of the Lynde Creek, which comprised of peats/organic soils up to about 6 m thick with moisture contents in the upper 3.6 m as high as 260%. This MUP alignment included a buried gas main towards the southern end of the proposed cross-section. In view of the shallow gas main (at the shallowest point, the invert of the gas main (0.3 m dia.) was about 1.8 m below ground surface), intrusive ground improvement methods were not favoured. A light-granular fill was used above to suppress buoyancy. Field shear vane testing and CPTU testing which shed light on the shear strength and consolidation characteristics of the compressible deposits coupled with FEM modelling enabled construction to proceed in a two-stage approach. The various geotechnical challenges of this project are discussed in the paper.

RÉSUMÉ: unicipalité régionale de Durham en Ontario, un passage chemin multi-usage (MUP) a été construit en 2018. Une section du passage chemin multi-usage cageuse -usage) comprenait une conduite de gaz enterrée vers le sud de la section transversale proposée. Compte tenu de la conduite de gaz peu profonde [au - sol], les méthodes .

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