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5.3.1 Stability charts results Table 5.5: Case 2 factor of safety from stability charts Analysis Undrained Taylor Bishop & Morgenstern Spencer Janbu 0.656 n/a n/a 0.656 n/a 1.266 1.038 n/a Drained For undrained analysis, Taylor and Janbuâs stability charts gave the same factors of safety as in Case 1 (i.e. the change in phreatic surface did not affect the factor of safety). Bishop and Morgensternâs and Spencerâs stability charts gave different factors of safety for the drained condition compared to Case 1, since the pore water pressures were now included. The pore pressure ratio (ðð¢ ) calculated for Bishop and Morgensternâs stability charts was 0.33, however for use in Spencerâs method ðð¢ = 0.25 which accounts for the differences between the two factors of safety. 5.3.2 Undrained analysis Table 5.6: Factor of safety from Case 2 Spreadsheet and SLOPE/W for undrained conditions Method Bishop simplified Fellenius Janbu simplified Morgenstern and Price Spencer General limit equilibrium Spreadsheet 0.755 0.755 n/a n/a n/a n/a SLOPE/W 0.748 0.748 0.730 0.757 0.757 0.756 Spreadsheet 0.735 0.735 n/a n/a n/a n/a SLOPE/W 0.730 0.730 0.719 0.735 0.735 0.730 No. of slices 5 20 0.730 Elevation (m) 15 10 5 0 0 5 10 15 20 25 30 35 40 Distance (m) Figure 5.7: Most critical slip circle in undrained SLOPE/W analysis with 20 slices 56