ABSTRACT
Jet grouting can be used to form a slab at the base of an excavation in soft clay. Such slabs can be used to control inward movement of the walls and/or to control basal stability. The design of the slab should consider all of the possible failure mechanisms. Conventionally, such slabs are designed as if they were layers of very strong soil. It is argued that it is more appropriate to design them as weak structural elements. Examples of the successful design and construction of jet grouted slabs are given.
