Abstract
For a given homogeneous slope with an arbitrary geometry, unit weight and pore water pressure distribution, the position of a critical failure surface will remain unique for a specified value of c′/tan ϕ′. Based on this theoretical relationship between c′ and ϕ′ and the critical slip surface, a straightforward back analysis method is proposed to estimate the magnitude of c′/tan ϕ′ from a known position of the failure surface observed in the field slope. The back analysis of c′/tan ϕ′ can easily be implemented by incorporating the method into existing limit equilibrium slope stability analysis software. When the c′/tan ϕ′ value is obtained, a pair of c′ and ϕ′ can uniquely be determined by considering the fact that the factor of safety is equal to unity.
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