In EPB tunnelling, the TBM soil conditioning agents have to be selected according to the geological conditions. The correct choice and use of well-adapted soil conditioners makes a considerable difference in the success of a tunnelling project - both in highly permeable soils and in sticky clay conditions.
Ground conditions originally judged to be ‘difficult’ can be transformed to be (more) manageable, drastically reducing the time for cleaning the TBM working chamber and cutterhead, thus avoiding unnecessary and/or frequent chamber interventions.
Soil conditioners allow TBM cutterhead torque to be reduced and decrease the cutterhead tool and screw wear, enabling the TBM to work in pressurised closed mode even under difficult mixed face conditions or in soils with high clay content. The different types of soil conditioner are used a follows
Eco-friendly Water Binding Polymer