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4.2
Summary of slope stability charts .............................................................................. 35
4.3
Limit equilibrium methods ........................................................................................ 36
In terms of total stress ....................................................................................................... 37
In terms of effective stress ................................................................................................ 38
5
4.3.1
Fellenius’ method 1936 ...................................................................................... 38
4.3.2
Bishop’s simplified method 1955 ....................................................................... 40
4.3.3
Morgenstern and Price 1965 ............................................................................... 41
4.3.4
Spencer’s method 1967 ...................................................................................... 42
4.3.5
Janbu’s simplified method 1968 ......................................................................... 43
4.3.6
General Limit Equilibrium method 1977 ........................................................... 46
4.4
Summary of limit equilibrium methods ..................................................................... 47
4.5
Limitations of limit equilibrium methods .................................................................. 48
4.6
Computer modelling .................................................................................................. 48
4.6.1
GeoStudio™ SLOPE/W ..................................................................................... 48
4.6.2
Microsoft Excel™ .............................................................................................. 48
4.6.3
Palisade’s @RISK software ............................................................................... 49
Comparison of deterministic methods............................................................................... 50
5.1
Baseline cases ............................................................................................................ 50
5.2
Case 1: One layer soil with no pore water effects ..................................................... 51
5.2.1
Stability charts results ......................................................................................... 52
5.2.2
Undrained analysis ............................................................................................. 52
5.2.3
Drained analysis ................................................................................................. 54
5.3
Case 2: One layer soil with phreatic surface.............................................................. 55
5.3.1
Stability charts results ......................................................................................... 56
5.3.2
Undrained analysis ............................................................................................. 56
5.3.3
Drained analysis ................................................................................................. 57
5.4
Case 3: Two layer soils with no phreatic surface ...................................................... 58
5.4.1
Stability charts results ......................................................................................... 59
5.4.2
Undrained analysis ............................................................................................. 60
5.4.3
Drained analysis ................................................................................................. 61
5.5
Case 4: Two layer soils with phreatic surface ........................................................... 62
5.5.1
Stability charts results ......................................................................................... 62
5.5.2
Undrained analysis ............................................................................................. 63
5.5.3
Drained analysis ................................................................................................. 64
5.6
Summary .................................................................................................................... 64
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