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NUMERICAL ANALYSIS OF SLOPE STABILITY IN EXPANSIVE SOIL: A CASE STUDY OF FIELD TEST IN HENAN PROVINCE, CHINA
Session: Landslide and Slope Stability / Mouvements de terrain et stabilité des pentes
Shunchao Qi, University of Ottawa (Canada)
Sai Vanapalli, University of Ottawa (Canada)
To investigate stability of expansive soil slope under the rainfall condition, a field study conducted by Zhang et al. (2010) in Henan Province, China, is analyzed using a comprehensive numerical procedure that involves the hydraulic Finite Element Analysis, followed by Factor of Safety (FS) calculation based on Limit Equilibrium Analysis. Several hydraulic properties functions; including the unimodal SWCC and permeability functions with increased saturated permeability and bimodal SWCC with its permeability functions are used to consider effects of cracks developed within the shallow layer. The results suggest that the bimodal hydraulic properties can better represent the hydraulic behavior of cracked expansive soils, and result a close match between the predicted and measured pore water pressure change over time. The calculated FSs illustrates the importance of selecting shear strength parameters under lower confining pressure from laboratory studies in the stability analysis of expansive soil surficial layer.
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