ABSTRACT
This paper describes a case history in Barcelona where a variety of jet-grout treatments were performed to help drive a tunnel through waterbearing sediments under an active railway line. After giving the geotechnical background of the problem as well as a brief account of the construction procedures applied, the paper focuses on the design tools employed. Several results from large-scale “in situ” tests are described; afterwards an example of a probabilistic approach employed in design is outlined. Finally a brief summary of the observed treatment outcomes is also given.
