Abstract
Most deep-seated landslides are characterized by large volumes with deep shear surfaces. They are sensitive to hydrological forcing, especially in climate change scenarios. This paper studies the role of soil–water interaction in affecting the motion of a deep-seated landslide near the southeast coast of China, where seasonal rainfall combined with annual typhoons caused the instability of a previous stable slope. A comprehensive investigation consisting of field monitoring and experiments of soil–water interaction is carried out. The monitoring data show that the landslide exhibits alternate dormant and active stages, corresponding to rainy and dry seasons, respectively. The enduring precipitations predominate the landslide motion, while intensive rainfall brought by typhoon events leads to transient deformation. In addition, wet treatment of intact and reconstituted soils is adopted to mimic the interaction between rainwater and landslide material. The results obtained from in-situ and laboratory direct shear tests indicate that the soil–water interaction is time-dependent. The long-term interaction gives rise to significant strength reduction of soils, thereby regulating the movement of the landslide.
Highlights
Deep-seated landslides occur all around the world and are known for their huge sliding mass with deep-buried shear surfaces
Typhoon events usually bring intensive rainfalls, which may lead to various mass
This work reports the correlation between rainfall and the motion of a deep-seated landslide located near the southeast coastal area of China
Summary
Deep-seated landslides occur all around the world and are known for their huge sliding mass with deep-buried shear surfaces. In mountainous areas, they could be initiated by self-weight, earthquake, and hydrological forcing Ronchetti et al (2010); Scaringi et al (2018a); Wang et al (2021), posing serious threats to settlements and infrastructures, such as railways, reservoirs, and telecommunication lines. Many studies revealed that the movement of. Rainfall is the most important type of hydrological forcing. Its effects on landslide movement have been the subject of many previous studies Wang and Sassa (2003); Crosta and Frattini (2008); Wang et al (2021a); Wang and Idinger (2021b). For deep-seated landslides, rainfall may temporarily accelerates the slope movement Wang et al (2018). Typhoon events usually bring intensive rainfalls, which may lead to various mass
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