Effects of the foot evolution on the behaviour of slow-moving landslides |
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| Authors: | A Ferrari A Ledesma DA González J Corominas |
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| Institution: | 1. Department of Physical Geography and Geoecology, Faculty of Science, University of Ostrava, Chittussiho 10, 71000 Ostrava, Czech Republic;2. Institute of Geography, Masaryk University, 61137 Brno, Czech Republic;3. Institute of Rock Structure and Mechanics, Czech Academy of Sciences, Prague, Czech Republic;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China;2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China;3. Department of Civil Engineering, Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 53300 Kuala Lumpur, Malaysia;4. Institute of Mine Safety Technology, China Coal Research Institute, Beijing 100013, China;5. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;6. Center for Assessment and Development of Real Estate, Shenzhen 518034, China;1. MOE Key Laboratory of Road and Traffic Engineering, College of Transportation Engineering, Tongji University, Shanghai 201804, China;2. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;3. Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA;4. Department of Civil Engineering, National Central University, Jhongli 32001, Taiwan;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China |
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| Abstract: | The paper presents a time-dependent 2D numerical model which has been developed with the purpose of highlighting the effects of the slope foot evolution on the behaviour of slow-moving landslides. The model allows to quantitatively analyse how foot mass variations can influence the stability and the movement rates of the landslide.The landslide body is modelled as composed of two rigid blocks sliding on two different planes and interacting through a common boundary, which position is assumed fixed during the analysis. A finite difference approach is used to discretize the time. For each time increment, changes in model parameters are allowed, including variations in shearing resistances, groundwater level and block masses (in order to simulate foot erosion). During each iteration, the overall stability of the system is checked computing the safety factor, assuming that the percentage of mobilized shear strength is the same for the three surfaces. If the system is not stable or if it is not at rest, the velocity of the system is computed solving the momentum equations for the two blocks taking into account destabilising and resisting forces, the mechanical interaction between the blocks and viscous components. Computed velocities are iteratively used to compute mass accumulation at the foot, which in turn results in a change of the stability condition of the system.Examples are provided in order to highlight the roles of the model parameters. Finally, the application to a real landslide (Vallcebre, Spain) is presented which shows the advantage of considering the foot mass in the analysis of the displacement trends and the possibility to take into account the foot erosion in the long-term behaviour of the slope. |
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