Poro-mechanical coupling influences on potential for rainfall-induced shallow landslides in unsaturated soils |
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| Institution: | 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan, PR China, 610059;2. Department of Civil Engineering and Applied Mechanics, McGill University, Montreal, QC, Canada H3A 0C3;3. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;4. ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, NSW, Australia;1. School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, B4B-07, Nanyang Avenue, 639798, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, #1B-36, 50 Nanyang Avenue, Singapore 639798, Singapore |
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| Abstract: | Rainfall-induced landslides are a common occurrence in terrain with steep topography and soils that have degradable strength. Rainfall infiltration into a partially saturated slope of infinite extent can lead to either a decrease or complete elimination of soil suction, compromising the slopes' stability. In this research the rainfall infiltration coupled with deformation of a partially saturated soil slope during rainfall infiltration is analyzed. The limit equilibrium conditions and the shear strength relationship of a partially saturated soil are employed to develop an analytical solution for calculating the stability of an infinite partially saturated slope due to rainfall infiltration. The analytical solutions are able to consider the influence of the coupled effects on the stability of the slope. The factors that affect the safety of a partially saturated slope of infinite extent are discussed. The results indicate that the poro-mechanical coupling of water infiltration and deformation has an important effect on the stability of the infinite unsaturated slope. |
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