Glossary
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- 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.