Displacement Back Analysis for a High Slope of the Dagangshan Hydroelectric Power Station Based on BP Neural Network and Particle Swarm Optimization

Table 1

Parameters employed in the numerical simulations.

Rock mass	𝑔  (g·cm^−3)	𝜎𝑐  (MPa)	𝐸  (GPa)	𝜇	𝑐  (MPa)	𝜙  (°)
II	2.65	70~80	18.00~25.00	0.25	2.000	52.43
III1	2.62	40~60	9.00~11.00	0.27	1.500	50.19
III2	2.62	40~60	6.00~9.00	0.30	1.000	45.00
IV	2.58	20~40	2.50~3.50	0.35	0.700	38.66
V1	2.45	<15	0.25~0.50	>0.35	0.500	33.02
V2	2.10	<10	0.20	>0.35	0.300	26.57