Study of preexisting shear surfaces of reactivated landslides from a strength recovery perspective |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China;1. Xi''an Jiaotong University, Xi''an, China;2. University College London, United Kingdom;3. Key Laboratory for Geo-hazard in Loess Area, Ministry of Land and Resources, Xi''an Center of China Geological Survey, Xi''an 710054, China.;1. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;2. Division of Tibet Plateau, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, PR China;2. School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada;1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, China;2. Department of Earth Sciences, Abbottabad University of Science & Technology, Pakistan;3. Monitoring Center of the Three Gorges, China Geological Environment Monitoring Institute, Yichang 443000, China |
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| Abstract: | Residual shear strength is generally considered in the design of preventive measures for slopes consisting of preexisting shear surfaces of large-scale landslides. Recent research suggests that the preexisting shear surface of a reactivated landslide can regain strength with the passage of time, which might also be considered in designing the slope stability measures. In this study, three reactivated landslide soils were tested in a ring shear apparatus for the discontinued shear periods of 1, 3, 7, 15, and 30 days with the following main objectives: (i) to understand the strength recovery behavior of landslide soils in a residual state of shear after as long as 30 days of discontinued shear, (ii) to understand the comparative pattern of strength recovery in highly plastic and less plastic soils, and (iii) to understand the mechanism involved in strength recovery at a residual state of shear. The results indicate that recovered strength measured in the laboratory is hardly noticeable after a rest period of 3 days, but recovered strength is lost after a small shear displacement. This paper primarily focuses on the effect of strength recovery from residual strength on preexisting shear surface soils and the mechanisms behind it. |
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| Keywords: | Reactivated landslide Residual strength Strength recovery Preexisting shear surface soils Ring shear test |
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