Abstract
By analyzing the instability characteristics of deformed body after impoundment and using limit equilibrium algorithm and UDEC discrete element simulation, the failure mechanism and stability of deformed body are studied in the paper. According to the deformation degree and instability characteristics of the deformed body in different storage periods, the mechanism of instability is analyzed. Based on the regional topographic map, a two-dimensional limit equilibrium model is established to calculate the potential failure surface range and slope stability factor of QD18 deformed body under the conditions of 1314m, 1364m and 1401m water level storage. And the displacement nephogram, velocity nephogram and rock block deformation map of the deformed body under the condition of 1401 m water level are simulated by using the discrete element software, and the stress changes of each part of the deformed body after water storage are analyzed, and the failure mechanism is summarized.
Highlights
Rocky bedded toppling bank slopes in reservoir area are often destroyed by reservoir water changes during storage or operation period
Goodman and Bray[1] divided the types of rock slope toppling into block toppling, bending toppling and block-bending toppling according to the deformation mode, and applied the limit equilibrium method to the stability evaluation of anti-dip rock slope
The toppling deformation of bank slope rock mass is serious which has a significant impact on the engineering safety of reservoir after impoundment, especially on the right bank transit highway
Summary
Rocky bedded toppling bank slopes in reservoir area are often destroyed by reservoir water changes during storage or operation period. Under the immersion of reservoir water, the decrease of rock mass and joint mechanical strength is very easy to cause collapse or landslide. Chen Zuyu[2] improved the Goodman-Bray method considering the connectivity of bottom slip surface and the tensile strength of rock bridge. There are many toppled and deformed rock masses on the bank slope of Miaowei Reservoir on Lancang River, and after reservoir impoundment, the toppling deformation intensifies, resulting in the collapse of the slope surface. The toppling deformation of bank slope rock mass is serious which has a significant impact on the engineering safety of reservoir after impoundment, especially on the right bank transit highway
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