HE Linlin,ZHOU Li,LIANG Yue.Research on Effect of Sudden Drawdown of Reservoir Water Level and Pile Foundation on Stability of High Filled Bank Slope[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):959-966.
HE Linlin,ZHOU Li,LIANG Yue.Research on Effect of Sudden Drawdown of Reservoir Water Level and Pile Foundation on Stability of High Filled Bank Slope[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):959-966. DOI: 10.13409/j.cnki.jdpme.2020.06.015.
Research on Effect of Sudden Drawdown of Reservoir Water Level and Pile Foundation on Stability of High Filled Bank Slope
Aiming at the fact that the sudden drawdown of reservoir water level may lead to failure of high filled bank slope, based on the analysis of the factors influencing the slope stability, the reasons for the decrease of shear strength of bank slope soil and the increase of sliding force under the sudden drawdown of reservoir water level were illustrated. Besides, considering the interaction of the pile and soil, the stability of the high pile wharf bank embedded in the high filled bank slope was involved. In this paper, taking the high pile wharf in the high filled bank slope in the Three Gorges reservoir area as an example, the stability coefficient and residual sliding force of the high filled bank slope under three working conditions were obtained by means of imbalance thrust force method. And taking the influence of piles into consideration, the stability of the bank slope under the third condition herein was analyzed by adopting the strength reduction method using ABAQUS. The results show when the reservoir water level drops from 175m to 145m, the stability coefficient of the bank slope decreases from 1.32 to 1.25, and the plastic deformation occurs in the area about 5m from slope toe to the filled platform. While the stability coefficient of the bank slope with the pile foundation increases from 1.25 to 2.0, the increment is about 60%. There is only a small amount of plastic deformation that occurs in sporadic zones between pile foundations. Therefore, the pile foundation of the wharf plays an obvious role in reinforcing the high filled bank slope.
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