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Figure 4.9: Bishop and Morgenstern’s charts for stability coefficients m and n for
(Murthy, 2002)
4.1.3
𝒄′
𝜸𝑯
= 𝟎. 𝟎𝟓 and 𝒏𝒅 = 𝟏. 𝟓𝟎
Spencer 1967
Spencer’s stability charts are based on the assumption of both force and moment equilibrium
(Spencer, 1967). The charts use three different pore pressure ratios (𝑟𝑢 ): 0, 0.25, and 0.5.
Spencer proposed an equation for the developed friction angle (𝜙𝑑 ) as:
𝜙𝑑 = tan −1 �
tan 𝜙
�
𝐹𝑠4.8
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