Abstract
Reservoir water level fluctuation is one of the main extrinsic factors that could change the stress field in landslides, as well as the mechanical strength of geomaterials, hence affecting the deformation and stability of landslides. The largest reservoir landslide in the Three Gorges Reservoir area was selected for a case study. The impact of reservoir water level fluctuation is represented by the dynamic change in the underground seepage field and was thereby analyzed with numerical modeling. The deformation behavior considering the rheological properties of the slip zone soil was studied. The sudden change in the displacement–time curve was selected as the failure criterion for the investigated landslide. The evolution process of the accelerated deformation stage was divided into slow acceleration, fast acceleration, and rapid acceleration stages. The Huangtupo landslide is characterized by a retrogressive landslide and is currently in the creep deformation stage; the deformation mechanism and deformation characteristics are closely related to the reservoir water level fluctuation. Research was carried out by means of field investigation, in situ monitoring, and numerical simulation to provide a true and reliable result for stability evaluation.
Highlights
Landslides tend to happen under the coupled effects of intrinsic-like rheological behavior and extrinsic factors, such as rainfall, earthquakes, and human activities [1,2]
Lots of research achievements on deformation characteristics and failure pattern respect to rainfall and reservoir water level have been obtained, for example, the evolution characteristics of the Huangtupo landslide based on in-situ tunneling and monitoring data were fully introduced, that rapid changes of reservoir water level has a huge influence on the landslide stability [15,16]
The underground seepage characteristics in the landslide were discussed by numerical modeling in Geostudio SEEP/W, and the rheological properties of the slip zone were taken into consideration in the study of the long-term deformation of the Huangtupo landslide
Summary
Landslides tend to happen under the coupled effects of intrinsic-like rheological behavior and extrinsic factors, such as rainfall, earthquakes, and human activities [1,2]. The long-term deformation pattern of an ancient landslide with a planar sliding surface in the TGRA was found to be deeply connected with periodic fluctuations in the reservoir water level [10]. The failure of these landslides is strictly influenced by the increase in pore water pressure and the consequent reduction in mean effective stress and is considered a complex slope instability phenomenon since the landslides exhibit distinct kinematic characteristics during the failure, post-failure, and propagation stages [11,12,13,14]. Once the relationship between the deformation characteristics and rainfall, or reservoir water level was found, the landslide prediction model can be established [17,18,19]
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