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spiling
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spiling

excavation
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Quick Summary

Spiling is a tunneling technique used in excavation, particularly in unstable or running ground conditions. It is an adaptation of an older method called forepoling, where planks are driven ahead to support the roof of an excavation. In spiling, these forepoles are used intermittently, with gaps between them. This method helps to advance the tunnel with minimal loss of ground.1

Spiling can involve driving rails or steel bars ahead into the ground to create support, especially when passing through difficult or crushed rock sections. This technique is crucial for maintaining the stability of tunnels during construction in challenging geological environments.1

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2 Britannica Sources
  1. spiling
  2. tunnels and underground excavations - Hand-mined tunnels

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