Unveiling the role of saturation and displacement rate in the transition from slow movement to catastrophic failure in landslides

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology Pub Date : 2025-04-05 DOI:10.1016/j.enggeo.2025.108042

Miguel Cueva , Xuan Kang , Shun Wang , Enrico Soranzo , Wei Wu

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引用次数: 0

Abstract

Landslides commonly evolve from slow, progressive movements to sudden catastrophic failures, with saturation and displacement rates playing significant roles in this transition. In this paper, we investigate the influence of saturation, displacement rate, and normal stress on the residual shear strength and creep behaviour of shear-zone soils from a reactivated slow-moving landslide in the Three Gorges Reservoir Region, China. Results reveal a critical transition from rate-strengthening to rate-weakening behaviour with increasing displacement rates, significantly influenced by the degree of saturation. This transition governs the observed patterns of slow movement punctuated by periods of accelerated creep, highlighting the potential for exceeding critical displacement rates to trigger catastrophic failure. Furthermore, partially saturated soils exhibited higher residual strength and greater resistance to creep failure compared to nearly and fully saturated soils, underscoring the contribution of matric suction to shear strength.

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揭示饱和度和位移速率在山体滑坡从缓慢运动向灾难性破坏过渡过程中的作用

滑坡通常会从缓慢、渐进的运动演变为突然的灾难性崩塌，而饱和度和位移速率在这一转变过程中发挥着重要作用。本文研究了饱和度、位移速率和法向应力对中国三峡库区重新启动的缓慢移动滑坡剪切带土壤的残余剪切强度和蠕变行为的影响。研究结果表明，随着位移速率的增加，土体的蠕变行为会从速率增强向速率减弱发生临界转变，而饱和度对这一转变的影响很大。这一转变决定了观察到的缓慢移动模式，其间夹杂着加速蠕变期，突出了超过临界位移速率引发灾难性破坏的可能性。此外，与接近饱和和完全饱和的土壤相比，部分饱和土壤表现出更高的残余强度和更强的抗蠕变破坏能力，这突出表明了母质吸力对剪切强度的贡献。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.