间歇降雨条件下带裂缝滑坡的水文响应与稳定性：综合物理模拟、数值模拟和实地调查

IF 6.3 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-09-24 DOI:10.1016/j.jhydrol.2025.134316

Chenyu Zhang , Shimei Wang , Li Wang , Yong Chen , Yuanyuan He , Xiaofeng Li , Kun Fang

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引用次数: 0

摘要

间歇性降雨对三峡库区带裂缝滑坡稳定性影响显著。本研究将物理模拟、数值模拟和实地调查相结合，研究间歇性降雨条件下带裂缝的水文响应和滑坡稳定性。首先，建立考虑裂缝位置和深度的滑坡物理试验模型，研究间歇性降雨作用下滑坡的变形过程和水文响应；随后，通过验证的数值模拟方法和现场调查，探讨了不同裂缝深度对滩家湾滑坡渗流场、位移场和稳定性的影响。结果表明：与无裂缝滑坡的渐进式浅层破坏模式相比，含裂缝滑坡在中后裂缝和中前裂缝作用下分别表现为“局部失稳-渐进式崩塌-深度滑动”和“浅趾滑动-深度渐进式崩塌”破坏模式；随着裂缝深度的增加，滑坡变形呈现非线性加速增长的趋势，具有明显的阈值效应。当裂缝深度比超过40%时，位移变化率急剧增大，表明滑坡失稳有加速的趋势。间歇降雨在深层土体中驱动“含水率逐步增加-残余孔隙水压力逐渐累积-有效应力逐步降低”的顺序过程，导致土体强度逐步退化，是滑坡失稳的关键因素。该研究为研究含裂缝滑坡失稳机理提供了理论参考，为三峡库区滑坡防治提供了科学依据。

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Hydrological response and stability of landslide with cracks under intermittent rainfall: integrating physical modeling, numerical simulation, and field investigations

Intermittent rainfall significantly impacts the landslide stability with cracks in the Three Gorges Reservoir Area (TGRA). This study integrates physical modeling, numerical simulation, and field investigations to investigate hydrological response and landslide stability with cracks under intermittent rainfall. Firstly, landslide physical test models were constructed considering crack locations and depths to investigate deformation processes and hydrological response of the landslides under intermittent rainfall. Subsequently, through the verified numerical simulation method and field investigation, the influence of different crack depths on the seepage field, displacement field and stability of Tanjiawan landslide is explored. The results show that, in contrast to the progressive shallow failure mode of the landslides without cracks, landslides with cracks exhibit failure modes of “local instability − progressive collapse-deep sliding” and “shallow toe sliding − deep progressive collapse” with the middle-rear crack and middle-front cracks respectively, due to the preferential seepage channels. As the crack depth increases, landslide deformation exhibits a trend of nonlinear accelerated growth with a distinct threshold effect. When the crack depth ratio exceeds 40%, the variation rate of displacement increases sharply, indicating an accelerated trend of landslide instability. Intermittent rainfall drives a sequential process in deep soil mass characterized by “stepwise increase in moisture content − gradual accumulation of residual pore water pressure − progressive reduction in effective stress”, leading to progressive degradation of soil strength and serving as a key factor in landslide instability. This study provides theoretical reference into the instability mechanisms of landslides with cracks and scientific support for landslide prevention and mitigation in the TGRA.

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.