Foundation Design and Osterberg Cell Pile Load Testing in Brisbane, Australia-Video

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Video Summary

Geotechnical engineer David Cunliffe presents the foundation design for a high-rise commercial development in central Brisbane. The project includes two towers and a multi-level basement on soft river sediments over Devonian rock. Ground improvement, a combi wall and a diaphragm wall support construction; the north tower’s core is founded on barrettes, while the south core uses a pile group. Tower columns bear on single large-diameter piles, with working loads reaching about 130 MN.<br /><br />The design adopted rock-socket skin-friction values toward the optimistic end of typical ranges, supported by an Osterberg-cell load test. Although the test did not fully mobilize skin friction in the strongest rock, engineers used extrapolation and Semset analysis to estimate ultimate capacity. Results supported the selected design values and also provided useful confirmation of working-load base pressure and rock-mass stiffness. The presentation highlights how testing helped optimize the foundations while managing uncertainty and construction constraints.

Keywords

geotechnical engineering

foundation design

high-rise commercial development

Brisbane

pile foundations

load testing