What the typical diameter range for mini piles is and why diameter selection is an engineering decision driven by loads and ground conditions rather than a standard choice applied uniformly across all projects

Mini pile diameters at Capital Piling range from 150mm at the lower end for lightly loaded residential and temporary applications through to 450mm at the upper end for more heavily loaded commercial and residential development projects. Within this range the specific diameter selected for any given project and any given pile position is determined by the structural load that pile must carry, the ground conditions it will be installed into, the depth at which competent bearing strata are available, and the access and equipment constraints that apply on the specific site. It is not selected from a preferred list or assumed from what was used on a previous project with superficially similar characteristics.

Diameter is one of the most consequential decisions in mini pile design because it directly affects the shaft friction available along the pile length, the end bearing resistance at the pile toe, the volume of grout or concrete required to complete the pile, and the installation time per pile. A diameter that is too small for the loads and ground conditions will produce a pile that cannot carry the design load without excessive settlement or outright failure. A diameter that is larger than necessary increases the cost of each pile without delivering structural benefit and may compromise the access advantages that mini piling offers on constrained sites by requiring a larger bore that takes longer to advance and produces more spoil.

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