The brief
The client wanted the excavation clear of internal propping so the building frame could start immediately, and the cut face fell inside the campus boundary with room to anchor.
Weathered rock at variable depth made a single nail length impossible to price honestly.
What we did
One contractor from the borelog to the final test certificate.
Six trial nails pull-tested before the design length was fixed, avoiding a blanket over-design.
1,240 m of soil nails at 89 mm, grouted and plate-anchored on a 1.5 m grid.
150 mm mesh-reinforced shotcrete face with weep drainage.
Pull-out tests on 5% of nails, all exceeding design capacity.
14 m
Cut face height
1,240 m
Nails installed
0
Internal props required
5 weeks
Ahead of programme
On site
“Trial nails before pricing saved us more than the trial cost. Nobody else offered that.”
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