Impact Analysis of Reservoir Water-level Fluctuation Speed on Reservoir Bank Building

Reservoir water-level fluctuation changes hydrogeological conditions and stress distribution status of reservoir bank slope and leads to settlement, bulging and horizontal sidesway of the building above it. Typical bank slope and building on the bank slope in the Chongqing section of the Three Gorges Reservoir Region in China were taken as study objects to explore influence laws of rising and falling speed of reservoir water on displacement and structural additional internal force of the reservoir bank building. Finite element software ABAQUS was employed to establish the 3D saturated– unsaturated seepage model and carry out the simulation calculation. Change laws of phreatic line in the bank slope, as well as structural additional internal force and foundation displacement of the reservoir bank building under different reservoir water-level fluctuation speeds, were compared. Results show that the height ratio of the phreatic line in the middle of the slope is 1.15 when descending speed of the reservoir water level is 4.2 m/d and 2.2 m/d. This phenomenon indicates that high descending speed of the reservoir water level denotes an increasingly intense seepage effect inside the bank slope. The displacement value of the reservoir bank building increases with the increase of the reservoir water-level fluctuation speed (within the same time period). When the ascending speed of the reservoir water level increases from 2.2 m/d to 4.2 m/d, the increase of axial force of structural column by 1.4 KN indicates that the structural additional internal force of the reservoir bank building elevates due to the increase of the reservoir water-level fluctuation speed. The obtained conclusions provide a significant reference for the safety evaluation of buildings on existing reservoir banks and building design on newly built reservoir banks. © 2021 School of Science, IHU. All rights reserved.