J S Harris and R J Reed. This paper was first published in GE’s September 1975 edition.
Measures to overcome a collapse situation in a heading at Stirchley, near Birmingham, involved teamwork between four contractors each specialising in his own geotechnical field. This account describes the problem and its solution with particular reference to the cryogenic refrigeration method pioneered and developed by Foraky Ltd. Ground freezing allowed excavation work to continue on a tunnelled section of the Stirchley and Cotteridge Sewerage Scheme being constructed for the Severn-Trent Water Authority (for whom Birmingham District Council’s City Engineer’s Department acted as agents).
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