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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
Fig. 1. Concrete coupon used for interface tests and topographical...
Fig. 2. Determination of shear stress increase upon restart of jacking...
Fig. 7. Relationship between shear stress increase after stoppage and...
Skin friction values reported in the literature for stoppages of...
Pipe-jacking stoppages modelled using direct shear interface tests
Conference Paper
Full-text available
  • Sep 2022
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. ...