An Anchored Bored Pile Wall Design – A Case History

摘要

Ipswich Motorway Upgrade – Dinmore to Goodna Project involved an upgrade of 8km of extremelyrnconstrained urban motorway from four lanes to a minimum six lanes. One of the many challenges onrnthe project was to carry out excavations within a narrow project corridor. One of the most criticalrnexcavations was a 9m deep cut with a 25m concrete swimming pool located 7m behind the crest. Thernstability and serviceability of this excavation were of paramount importance due to the proximity of arnswimming pool behind the crest and motorway in front of the toe. With careful design and constructionrnconsiderations, an anchored bored pile wall was selected to support the cut. This paper aims tornpresent a systematic approach to design an anchored bored pile wall in accordance with AustralianrnStandard AS5100.3 – Foundations and Soil-supporting Structures. The wall performance and designrnare assessed by comparing the calculated and measured wall movements. One year after thernconstruction, the wall performed well and the swimming pool showed no signs of distress.