Slope Stability Parameters: infinite_slope#20
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#20 | phi28#D1#ru0#kh0 | 0.05 | 1 | 1.38 | 28 | infinite_slope | c-phi soil dry: FS = c'/(gamma*H*sin(beta)*cos(beta)) + tan(phi')/tan(beta); H=depth to failure surface; c/(gamma*H)=0.05 | 0 | 0 | 20 |
| infinite_slope#20 | phi28#D1#ru0.5#kh0 | 0.05 | 1 | 0.96 | 28 | infinite_slope | c-phi soil saturated with seepage; FS = c'/(gamma_sat*H*sin(beta)*cos(beta)) + (gamma'/gamma_sat)*tan(phi')/tan(beta) | 0.5 | 0 | 20 |
| infinite_slope#20 | phi30#D1#ru0#kh0 | 0 | 1 | 1.55 | 30 | infinite_slope | Dry cohesionless: FS=tan(30)/tan(20)=0.577/0.364=1.58 | 0 | 0 | 20 |
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