Comparison of Design Approaches for Working Platforms Used for Piling Plant

There are a variety of analytical design approaches for the design of working platforms commonly used in the UK (BRE 470, Ciria SP123, Temporary Works Forum) which vary in their complexity and critical parameters they consider. These different approaches can lead to a variation in working platform thickness; some have attracted criticism for appearing conservative compared to empirical methods based on historical practice. A number of UK design approaches for working platforms (including analytical, empirical and numerical methods) are compared with the merits of the different approaches considered.

The paper will also consider the particular aspects of extrusion and edge failures for sites with combinations of high rig loading and very soft underlying soils. Suggestions for improving edge stability of platforms are presented with particular emphasis on the efficient use of geogrids and geotextiles to increase the allowable surface bearing pressures, reduce the platform thickness and improve edge stability.