Impact of fluid turbulent shear stress on failure surface of reservoir bank landslide
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Based on geological investigation, in situ monitoring data analysis, and numerical simulation, a new approach to explain the effect of the reservoir water storage on activation of the sliding phenomenon is discussed in this paper. The paper proposed the method of groundwater level distribution function in case of different rate of water level rise in reservoir by using Boussinesq equation solved by Laplace change and Laplace inverse transformation. On comparing the in situ deformation monitoring data and fluid flow property near sliding surface, the mechanism of reservoir water-induced slope instability was understood. Fluid dynamic property affecting the slope deformation can be described as turbulent bottom shear stress at the failure surface for the phreatic water type landslide. The relationship between the stability coefficient, the deformation of the slope, and the fluid flow was established by using modified Boussinesq equation. Finally, with due consideration to the stability of the reservoir bank landslide, the method of calculation for rate of critical reservoir water storage was provided.
KeywordsWater induced landslide Turbulent bottom shear stress Failure surface Fluid dynamic characteristics Critical reservoir water storage rate
The numerical simulations of FLUNT were conducted on the coastal engineering group of University College London. The great supports of students of the Engineering Geology and Geohazards Institute of Hohai University. Some presented data are available upon request from Kunming Engineering Corporation Limited of PowerChina. The authors are grateful to Dr. Debi Prasanna Kanungo, Senior Principal Scientist, Central Building Research Institute (CSIR), India, for his comments and suggested corrections of English usage to improve this paper.
This work was supported by the Science Foundation (ID 20158101216) of China Huaneng Group CO.,LTD., Chinese National Key Technology R&D Program Founding (No. 2012BAB03B02-01), and Fujian Eastern-China Geotechnical Engineering CO.,LTD.
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