Forepoling (Spilling)
Term | Definition |
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Forepoling (Spilling) |
A ground improvement measure carried out by inserting bars, rods or tubes at the face so as to form a splayed arch ahead of the tunnel. It can involve areas of jet grouting or ground freezing. Previously, the term was used more narrowly. It related to polling boards driven on a splay ahead of the face of an excavation.
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