A Brief Review of Geotechnical Aspects and Monitoring of Gateway Arterial Roadworks North of the Brisbane River
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This paper provides a brief summary of geotechnical aspects of 24km of arterial road north of the Gateway Bridge. The terrain encountered includes 17km of swampland with soft soils extending up to 20m in depth. The main problems resulting from these conditions are those of embankment settlement and stability and the need for staged construction. The geotechnical design approach has involved observing embankment performance to confirm preliminary estimates and to permit construction programming. Several ground improvement techniques have been employed, which included preloading, surcharging, vertical drains, stone columns and geotextile and steel mesh reinforcement of embankments. Comparisons of predicted and actual settlement behaviour are made together with discussion of observed creep. Conclusions are drawn on the effectiveness of the techniques employed. These conclude that on a cost comparative basis CPT based predictions were at least as good as laboratory based ones.