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Tunneling below the three Russia Wharf buildings in downtown Boston for a light rail passenger line required support to prevent damage to the timber pile-supported structures. Ground freezing provided tunnel face stability and prevented groundwater flows.

This paper sets out the information required from a site investigation necessary for the successful design and construction of shafts which need Artificial Ground Freezing (AGF) for ground stability control and or groundwater ingress prevention during sinking.

This paper reviews past mine projects where an innovative approach has been adopted using
Artificial Ground Freezing (AGF) on a large scale for their successful completion. The importance of the process of AGF in the mining world cannot be overstated. In fact,
without ground freezing in many cases, such construction works would not have been possible.

Artificial Ground Freezing (AGF) has long been established as a reliable technique for the stabilization of weak and/or water-bearing strata, as an aid to excavation for shafts and tunnels, many engineers still regard it as a high-cost solution of last resort. This paper attempts to identify some of the salient factors which influence the cost-effectiveness of the AGF process versus the use of grouting.