'Ground anchors' (soil nails or rock anchors) in deep excavations resist:
Choose the correct answer
Only compression loads on wall
Tensile forces from wall/slope wanting to move — anchor transfers tension to stable ground through grouted fixed zone
Seismic vibration only
Wind loads on adjacent buildings
Correct Answer
B. Tensile forces from wall/slope wanting to move — anchor transfers tension to stable ground through grouted fixed zone
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Ground anchor: steel tendon or bar drilled into soil/rock at angle; grouted in at fixed length; pre-stressed against anchor head on wall. Transfers tensile force to stable ground beyond failure wedge. Used for: (1) Retaining wall tie-back (prevents overturning/sliding); (2) Foundation uplift resistance; (3) Slope stabilisation. Pre-stressed anchors: minimise wall deflection. IS 14448 covers soil anchors. Load test: proof load test (110% design load).
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