Slope Stability Parameters: Bishop_simplified#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) |
|---|---|---|---|---|---|---|---|---|---|---|
| Bishop_simplified#30 | phi20#D1#ru0#kh0 | 0.075 | 1 | 1.5 | 20 | Bishop_simplified | Bishop simplified method: FS from circular failure; phi=20 deg; c/(gamma*H)=0.075; FS=1.5 typical for design | 0 | 0 | 30 |
| Bishop_simplified#30 | phi20#D1#ru0.3#kh0 | 0.075 | 1 | 1.2 | 20 | Bishop_simplified | ru=0.3 (moderate pore pressure); FS reduced from 1.50 to 1.20; ru = u/(gamma*z) | 0.3 | 0 | 30 |
| Bishop_simplified#30 | phi20#D1#ru0.5#kh0 | 0.075 | 1 | 1.05 | 20 | Bishop_simplified | ru=0.5 (high pore pressure ratio); approaching failure; critical for saturated embankments | 0.5 | 0 | 30 |
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