ABSTRACT
Following the criteria introduced in Chapter 6, the design calculations for some of the most typical jet grouting applications are described in this chapter. The examples herein reported are
• Foundations • Tunnel canopies and vertical shafts • Hydraulic cutoffs • Bottom plugs
The former two applications have a static function, whereas the purpose of the latter two cases is to provide a water barrier to seepage. Jet-grouted foundations are always designed as permanent structures, while jet grouting applications for tunnels and shafts are provisional construction means. Hydraulic cutoffs and bottom plugs may have both provisional and/or permanent functions. Foundations, shafts and canopies are analysed, pointing out the static role of the jet-grouted structures and suggesting practical calculation methods to quantify their resistance against possible collapse mechanisms. The static capacity of these jet-grouted structures is determined, starting from both the geometrical and mechanical characteristics of the jet-grouted elements, and then considering their overall geometrical arrangement and the way multiple elements interact with each other and with the surrounding soil.
