Abstract
Most landslides induced by reservoir impoundment and rainfall in the Three Gorges Reservoir area of China are usually characterized by bedding-plane shear zones. This paper presents an experimental study of the interaction between water and shear-zone materials. A series of tests, including wetting-drying cycles and soaking tests, were carried out. The results show that the fluid-solid interaction not only reduces the shear strength of shear-zone soil but also accelerates the disintegration process of clastic rock from shear zone. After the fluid-solid interaction at different pH values, the clastic rock samples produce the most clay minerals in acidic solution. Similarly, the clay minerals of shear-zone soil samples increase dramatically after 45 days of soaking in acidic environment. According to the tests, it is found that the shear-zone soil in eluvium may originate from the weathered clastic rock near the shear zones under long-term fluid-solid interaction.
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Funding
This work was funded by National Natural Science Foundation of China (No. 41772314) and the project of Industry-University-Research Foundation in China University of Geosciences, Wuhan, with grant number 2018056199.
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Kang, X., Xu, G., Yu, Z. et al. Experimental investigation of the interaction between water and shear-zone materials of a bedding landslide in the Three Gorges Reservoir Area, China. Bull Eng Geol Environ 79, 4079–4092 (2020). https://doi.org/10.1007/s10064-020-01812-z
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DOI: https://doi.org/10.1007/s10064-020-01812-z