Evolution trend of reservoir bank landslides driven by numerical simulation and mechanism analysis

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2025-04-10 DOI:10.1007/s10064-025-04239-6

Xiangwei Fang, Yucheng Wang, Luqi Wang, Wengang Zhang, Chao Chen, Huiwen Deng

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Abstract

Landslide disasters have become frequent in the Three Gorges Reservoir area (TGRA) since the first reservoir impoundment in 2003. This study aims to investigate the evolution of landslide disasters on the reservoir bank by analyzing the influence of reservoir water level (RWL) fluctuations and rainfall, taking the Jiuxianping landslide in the area as an example. Employing finite element numerical simulation methods, in conjunction with in-depth on-site investigations and the analysis of monitoring data gathered between 2016 and 2019, the study successfully replicated the step-up deformation pattern and elucidated the progressive evolution of the Jiuxianping landslide. The results indicate that the seepage within the landslide is primarily influenced by rainfall in the upper part of the landslide, by RWL in the lower part, and by a combination of both in the middle part. The landslide stability is primarily affected by RWL fluctuations, and rainfall further exacerbates the instability. The cyclical effects of RWL and seasonal rainfall account for the progressive deformation of the landslide in stages, consistent with the step-up characteristics observed in the displacement-time monitoring curve. The research results provide a reasonable basis for the follow-up prevention and control of the Jiuxianping landslide and a reference for the deformation and evolution research of other landslides in the reservoir area.

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库岸滑坡的数值模拟与机理分析

三峡库区自2003年首次蓄水以来，滑坡灾害频繁发生。本研究以酒仙坪滑坡为例，通过分析水库水位波动和降雨对库岸滑坡灾害的影响，探讨滑坡灾害对库岸的演变规律。采用有限元数值模拟方法，结合深入的现场调查和2016 - 2019年的监测数据分析，成功复制了酒仙坪滑坡的阶梯变形模式，阐明了酒仙坪滑坡的渐进演化过程。结果表明，滑坡内部的渗流主要受滑坡上部降雨的影响，下部受RWL的影响，中部受两者的共同影响。滑坡稳定性主要受RWL波动的影响，降雨进一步加剧了滑坡的不稳定性。RWL和季节性降雨的周期性作用是滑坡阶段性渐进变形的原因，与位移-时间监测曲线的递进特征一致。研究结果为酒仙坪滑坡的后续防治提供了合理依据，也为库区其他滑坡的变形演化研究提供了参考。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.