Stability of Completely Decomposed Granite Slopes under Intense Rainfall Infiltration based on the Random Field Theory
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Abstract
Completely decomposed granite (CDG) is subjected to substantial amount of spatial variability. The purpose of this paper is to investigate the effect of spatial variability of the shear strength parameters of CDG on the stability of CDG slopes under intense rainfall infiltration. In the method used in this paper, the pore water pressure is modeled using the wetting font concept. The spatial variability of the strength parameters is modeled based on the random fields. The factor of safety of the slope is computed using the shear strength reduction method. It is found that the presence of spatial variability will change the failure modes of the slope. As the correlation distance reduces, the size of the sliding mass also tends to reduce. The stability of the soil will be more sensitive to the advancing of the wetting front. Ignoring the negative correlation between the cohesion and the friction angle will overestimate underestimate the failure probability of the slope.
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