Dynamic Stability Discrimination Method for Concrete Dam under Complex Geological Conditions

Table 4

Catastrophe discrimination results of the points at the dam toe and heel with different reduction coefficients (20% increase in the dam foundation strength).

Reduction coefficient	Key points	u		Δ	Result of catastrophe discrimination
2.2	Dam heel	0.036515	0.005371	0.000974	Noncatastrophe
	Dam toe	0.072672	0.009195	0.003818	Noncatastrophe
2.4	Dam heel	−0.07127	−0.01014	0.001325	Noncatastrophe
	Dam toe	0.05249	0.012883	0.005060	Noncatastrophe
2.6	Dam heel	−0.05448	0.001862	−0.000553	Catastrophe
	Dam toe	−0.06151	0.000709	−0.000917	Catastrophe
2.8	Dam heel	−0.13847	−0.00122	−0.010581	Catastrophe
	Dam toe	−0.16737	0.001011	−0.018727	Catastrophe
3.0	Dam heel	−0.11747	−0.00111	−0.006450	Catastrophe
	Dam toe	−0.11705	−0.00115	−0.006379	Catastrophe
3.2	Dam heel	−0.18426	0.00634	−0.023939	Catastrophe
	Dam toe	−0.15204	0.00152	−0.013995	Catastrophe