The International Society for Trenchless Technology

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Glossary

There are 211 entries in this glossary.
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Term Definition
Face

The undisturbed soil immediately ahead of the shield.

Ferro-Cement

Material comprising cementitious and steel elements to form a structural lining, which is either placed in situ in a man-entry size pipeline or tunnel, or is preformed into segments for later installation.

Filter Cake

A thin layer of bentonite drilling fluid that seals the borehole preventing the flow of liquids from the borehole into the native soil.

Fluid Assisted

Method of guided drilling using a combination of mechanical drilling and Boring/Drilling pressurised fluid jets to provide the soil cutting action.

Fluid Density

See Mud Weight

Fold & Form Lining

Method of pipeline rehabilitation in which a liner is folded to reduce its size before insertion and reversion to its original shape by the application of pressure and/or heat.

Frac-out

See Hydrofracture

Free Boring

Method of auger boring without a casing.

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