Which of these methods of tunnel construction is not suitable in rocks?
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A.
Drift method
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B.
Compressed air method
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C.
Heading and benching method
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D.
Full face method
Correct Answer:
B. Compressed air method
Explanation:
The compressed air method is not suitable for tunnel construction in rocks because it is specifically designed for soft, water-bearing soils or unstable ground conditions where water ingress is a major concern. In this technique, air pressure is increased within the tunnel to balance the external hydrostatic pressure, preventing water and mud from entering the working area. Conversely, methods like the drift, full face, and heading and benching methods are standard practices for excavating through solid rock formations.
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