Slope Stability Parameters: infinite_slope#30
Slope stability parameters — Taylor stability numbers (Ns) for c-phi and phi=0 soils with depth factors, infinite slope factor of safety (dry and saturated), and Bishop simplified method FS values with pore pressure ratio and seismic coefficient
| method slope | phi D key | cohesion ratio c over gamma H (dimensionless) | depth factor D (dimensionless) | factor of safety (dimensionless) | friction angle deg (deg) | method | notes | pore pressure ratio ru (dimensionless) | seismic coefficient kh (dimensionless) | slope angle deg (deg) |
|---|---|---|---|---|---|---|---|---|---|---|
| infinite_slope#30 | phi25#D1#ru0#kh0 | 0 | 1 | 1 | 25 | infinite_slope | Dry cohesionless: FS = tan(phi)/tan(beta); at beta=phi, FS=1.0; c/(gamma*H)=0 for sand | 0 | 0 | 30 |
| infinite_slope#30 | phi25#D1#ru0.5#kh0 | 0 | 1 | 0.48 | 25 | infinite_slope | Saturated with seepage parallel to slope: FS = (gamma_prime/gamma_sat)*tan(phi)/tan(beta); gamma_prime/gamma_sat approx 0.5; FS=0.5*tan(25)/tan(30)=0.5*0.466/0.577=0.40 | 0.5 | 0 | 30 |
| infinite_slope#30 | phi30#D1#ru0#kh0 | 0 | 1 | 1 | 30 | infinite_slope | At beta=phi: FS=1.0 for cohesionless dry slope | 0 | 0 | 30 |
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