1.重庆交通大学国家内河航道整治工程技术研究中心,重庆 400074
2.重庆交通大学水利水运工程教育部重点实验室,重庆 400074
3.重庆交通大学河海学院,重庆 400074
贺林林(1983-),女,副教授,硕导,博士。主要从事港口海岸及近海工程结构设计理论和方法、土与结构相互作用方向的研究。Email:helinl@126.com
收稿:2018-09-07,
修回:2018-11-05,
纸质出版:2020-12-15
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贺林林,周莉,梁越.库水位骤降与桩基作用对高填方岸坡稳定性影响研究[J].防灾减灾工程学报,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.
贺林林,周莉,梁越.库水位骤降与桩基作用对高填方岸坡稳定性影响研究[J].防灾减灾工程学报,2020,40(06):959-966. DOI: 10.13409/j.cnki.jdpme.2020.06.015.
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.
针对库水位骤降可能导致高填方岸坡滑坡,从分析岸坡出现滑坡的因素出发,阐释了库水位骤降作用下岸坡土体抗剪强度降低及岸坡下滑推力增大的原因,同时考虑嵌入高填方岸坡的高桩码头桩基结构⁃岸坡土体相互作用下岸坡稳定性的变化。本文以三峡库区某高填方岸坡高桩码头为例,通过不平衡推力法,求得三种工况下高填方岸坡的稳定系数和剩余下滑推力;并借助ABAQUS有限元软件,在本文工况三的基础上,采用强度折减法分析桩基作用下岸坡稳定性的变化。结果显示:库水位从175 m骤降到145 m,岸坡稳定系数从1.32减小至1.25,且坡脚至填方平台以下约5 m的区域出现较大塑性变形;而在桩基作用下岸坡的稳定系数从1.25增加至2.0,增加了60.0%,桩基间仅小范围出现较小塑性变形。因此,码头桩基对高填方岸坡起着较明显的加固作用。
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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