Flowchart of DEM Modeling Stability Analysis of Large Underground Powerhouse Caverns

Table 4

Reference earthquake motion parameters of the Dagangshan hydropower plant.

Probability of exceedance	50 a			100 a
	= 63%	= 10%	= 5%	= 2%
PGA (gal)	51	165	336	558
Calculation value	—	—	168	279

PGA-peak ground acceleration; unit: gal, 1gal = 1 cm/s/s.