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96 Mill Point Road Development Lateral Support

The proposed development at 96 Mill Point Road, South Perth, WA comprises 5 basement and 22 above ground levels. Ground water was encountered some 2m below natural ground level (NGL). This combination of features presented an interesting case study.  ARQ Consulting Engineers was approached to conduct a preliminary and detailed design for the lateral support and foundation of the development. This article discusses the findings of 3 design options which were evaluated, analysed and compared.

The soil profile underlying the site comprised alluvial sand, Guildford clay and residual Tamala limestone. Tamala limestone bedrock was encountered at 24m to 26m below NGL.

Material properties relevant to the design are included in the table below. Where possible these material properties (such as permeability, unit weight and Young’s modulus) were obtained from a geotechnical investigation report conducted by CMW Geosciences (Pty) Ltd.