23.3.3. Types of TBMs

Try these first

1. 1.

   What does TBM stand for?

   Hint

   Remember the full term for TBM.

2. 2.

   Name one type of TBM.

   Hint

   Think of a TBM you’ve heard about.

3. 3.

   What is the function of an Earth Pressure Balance TBM?

   • To drill through hard rock
   • To stabilize soil pressure
   • To operate open-faced

   Hint

   Think about how the ground conditions affect the operation.

4. 4.

   True or False: Slurry Shield TBMs can operate in high water inflow conditions.

   • True
   • False

   Hint

   Recall its mechanism.

5. 5.

   You are tasked with planning a deep tunnel in an urban area with high groundwater levels. What type of TBM would you recommend and why?

   Hint

   Consider how various TBMs manage water.

6. 6.

   Discuss the trade-offs between using an Earth Pressure Balance TBM versus a Hard Rock TBM in mixed soil conditions.

   Hint

   Think about the types of materials being excavated.