A 'diaphragm wall' (slurry wall) for deep basement excavation is constructed by:
Choose the correct answer
Driving steel sheet piles with vibratory hammer
Trenching under bentonite slurry, placing rebar cage, tremie concrete from bottom — forms permanent RC panel
Injecting concrete grout only
Installing pre-cast panels from surface
Correct Answer
B. Trenching under bentonite slurry, placing rebar cage, tremie concrete from bottom — forms permanent RC panel
Why is this the answer?
Diaphragm wall: trench excavated panel by panel (3–6 m long) under bentonite slurry (supports trench stability by hydrostatic pressure). Rebar cage lowered. Concrete tremied from bottom displacing slurry. Panels joined by stop-end pipes or water-stops. Walls reach 30–60 m depth. Functions: (1) Permanent basement wall; (2) Water cutoff; (3) Retaining wall during excavation. Used in: Mumbai metro, Kolkata metro stations, high-rise basements.
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