Q166
What type of rock caused excessive wear on TBM cutters in the Delhi Metro Phase III tunneling?
A.
Shale
B.
Quartzite
AnswerC.
Basalt
D.
Sandstone
Answer: Option B
Solution
Answer: Option B
Solution:
Quartzite is a very hard, abrasive metamorphic rock. In Delhi Metro Phase III, TBMs experienced high tool wear when tunneling through quartzite layers, requiring frequent maintenance and cutter replacements.