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Concrete coupon used for interface tests and topographical image of 0.439 mm × 0.330 mm zone.

Concrete coupon used for interface tests and topographical image of 0.439 mm × 0.330 mm zone.

Source publication
Conference Paper
Full-text available
In long pipe-jacking drives used for installing utility pipelines, maximum jacking load requirements are usually governed by skin friction at the pipe-soil interface. In addition, field experience has shown that transient peaks in skin friction arise upon recommencement of jacking after stoppages; these stoppage durations can be short (due to the a...

Context in source publication

Context 1
... for zones of 0.439 mm × 0.330 mm located at the centre and near two corners of the coupon. These values were a close match for R a values for a section of a typical concrete jacking pipe (supplied by an Irish precast concrete manufacturer) using the same optical technique. The concrete coupon and an example surface profile are displayed in Fig. 1. ...