The International Society for Trenchless Technology

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There are 211 entries in this glossary.
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Term Definition
Gel Strength

The measure of electrical attractive forces of the drilling fluid that allows the drilling fluid to suspend drilled solids as they are transported by the slurry out of the bore hole.

Ground Penetrating Radar

Nondestructive method for detecting subsurface structures, voids, discontinuities, and changes in material. GPR uses radar pulses transmitted into the ground to image the subsurface by recording electromagnetic signals reflected back to the GPR system.


The process of filling voids or modifying/improving ground conditions. Grouting materials may be cementitious, chemical or other mixtures. In microtunneling grouting may be used to fill voids around the pipe or shaft or to improve ground conditions.

Guide Rails

Steel or timber rails set firmly in the thrust pit to give directional control of the pipes to be jacked and for accurate location of the pipe joints.

Guided Auger Boring

Method of auger boring in which the guidance mechanism actuator is sited in the drive shaft. The term may also be applied to those auger boring systems with rudimentary articulation of the casing near the cutting head activated by the rods from the drive shaft.

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