Why do basement retaining walls require staged lateral earth-pressure narratives rather than single K0/Ka placeholders?
Choices
- (A) Compaction sequencing, surcharge timing, and partial strut removal change apparent thrust lines
- (B) Passive resistance is mobilised uniformly before anchors are stressed
- (C) Construction surcharges disappear once slabs cure
- (D) At‑rest coefficients stay invariant under every contractor sequence
Correct answer: (A)
Compaction sequencing, surcharge timing, and partial strut removal change apparent thrust lines
Explanation
Stage excavation alters pore pressures and surcharge envelopes against the stem.