Application of Recovered Strength in Stability Analysis of Reactivated Landslide, Xuechengzhen, China

In this paper, the application of recovered strength in the stability analysis of a reactivated landslide is proposed. Residual strength parameters have been estimated to be c_r = 0 kN/m² and φ_r = 24.8° at normal stresses above 200 kN/m², and recovered strength parameters have been estimated to be c_rc = 5.5 kN/m² and φ_rc = 26.4° below 150 kN/m². In the stability analysis, the recovered strength parameters have been applied to the slices of the head and the toe of the slide under the effective overburden pressures equivalent to σ_n < 150 kN/m², and the residual strength parameters of c_r and φ_r have been applied to the slices of the central zone under the effective overburden pressures equivalent to σ_n > 150 kN/m². By applying the recovered strength parameters, the safety factor has increased from Fs =1.00 to Fs =1.05. Therefore, a result that supports the re-slide pattern has been obtained.