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Stability characteristics of shallow landslide triggered by rainfall

Journal of Mountain Science 2019年第9期16卷 2171-2183页

作者： Avirut CHINKULKIJNIWAT Taworn TIRAMETATIPARAT chanathip supotayan Somjai YUBONCHIT Suksun HORPIBULSUK Rattana SALEE Panich VOOTTIPRUEX School of Civil Engineering Center of Excellence in Civil Engineering Institute of Engineering Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Department of Civil Engineering Rajamangala University of Technology Isan Nakhon Ratchasima 30000 Thailand Department of Teacher Training in Civil Engineering King Mongkut's University of Technology North Bangkok 10800 Thailand

Rainfall induced shallow landslides are known to be extremely dangerous since the sliding mass can propagate quickly and travel far from the source. Although the sliding mechanism in sloping ground is simple to understand, the problem may be complicated by unsaturated transient water flow. The flow behavior of rainwater in unsaturated sloping ground and the consequent factor of safety must be clearly understood to assess slope stability under rainfall conditions. A series of laboratory experiments was conducted to examine the critical hydrological states so that assessment of slope stability under rainfall condition can be performed. Based on the test results, a unique relationship between critical hydrological states, rainfall intensity, and soil properties was formulated. Sequential stability analysis provided insights into the stability of slopes subjected to variations in soil properties, slope angles and rainfall intensities, and the consequent variation in the depth of the failure plane, vital in landslide risk assessment, was determined through this analysis.The variation of rainfall intensity was found to strongly affect the depth of the failure plane in cohesionless sloping ground. Furthermore, the influence of rainfall intensity on the depth of the failure plane may be alleviated by a small magnitude of cohesive strength. The results of this study will reinforce knowledge of landslide behavior and help to improve mitigation measures in susceptible areas.

关键词： Shallow landslides Rainfall Failure depth

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