The 'seismic coefficient method' (pseudo-static) for slope stability analysis under earthquakes uses:
Choose the correct answer
Dynamic time-history analysis of slopes
Applies static horizontal force k_h×W on sliding mass (k_h = fraction of PGA) and re-computes FOS
Only vertical seismic coefficient
Assumes no earthquake forces (only static loads)
Correct Answer
B. Applies static horizontal force k_h×W on sliding mass (k_h = fraction of PGA) and re-computes FOS
Why is this the answer?
Pseudo-static (seismic coefficient) method: earthquake acceleration amax = k_h×g (horizontal) and k_v×g (vertical) applied as static forces on sliding mass. Additional destabilising force F_h = k_h×W on the slope. Reduces FOS. k_h ≈ 0.5×(PGA/g) conservatively (IS 1893). FOS_seismic = FOS_static × reduction factor. Approximate — ignores transient nature of earthquake and excess pore pressure (dynamic).
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