Tunnel Construction MCQ with answer and solution

Concept

Tunneling in soft ground requires temporary supports like timbering, needle beams, or liner plates to prevent caving in during excavation.

Step-by-step solution

1. Identify the recognized soft ground tunneling techniques: Needle beam, German, Belgian, English, Liner plate, Forepoling, Shield methods. 2. Evaluate the options: German method, Needle beam method, and Liner plate method are standard soft soil tunneling methods. 3. Identify option (D) Cantilever car dump method as not being a tunneling method used for soft ground excavation.

Explanation

Methods used for tunneling in soft soil include the Needle Beam method, German method, Belgian method, English method, Forepoling method, American method, and Liner Plate method. The Cantilever car dump method is not a recognized method for excavating tunnels in soft soil.

Why the other options are wrong

A: The German method is a well-known soft soil tunneling method using side drifts. B: The Needle beam method is a traditional timbering method used for tunneling in soft soil. C: The Liner plate method uses corrugated steel plates to support soft ground during tunneling.

Common mistake

Confusing European tunneling methods (German, Belgian, English, Austrian) with non-tunneling or mechanical disposal terminology.