Study on the chain-type failure mechanism of large-scale ancient landslides

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-09-19 DOI:10.3389/feart.2024.1466751

Zixuan Li, Zhenwei Dai, Shi Cheng, Zhe Yang, Anle Zhang, Qihui Xiong

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引用次数: 0

Abstract

Large-scale ancient landslides are widely distributed in Southwest China, yet their reactivation mechanisms remain complex and poorly understood. On 25 July 2020, one such landslide in Liujing Village, Wulong District, Chongqing, China, experienced reactivation. This event exhibited variable movement characteristics across different areas and times, ultimately manifesting as a chain-type failure. Combining field investigations and drilling works, this study describes the fundamental characteristics of the Zhongbao landslide and the variation rules of the seepage field and the stability by numerical simulations. The failure mechanism is preliminarily revealed, and the failure influencing factors are discussed. The results show that, the landslide’s progression was influenced by the stratigraphic lithology and the morphology of the sliding surface, resulting in two distinct turns during its movement. By analyzing the landslide’s spatial morphology, direction of sliding, material composition, extent of the accumulation area, and dynamic behavior, we have categorized the Zhongbao landslide into five principal zones. The failure process can be segmented into four stages: initiation, shear-out, acceleration, and accumulation blockage. Heavy rainfall served as the primary trigger for the landslide, while the microtopography of the sliding surface significantly influenced the failure dynamics. The insights gained from this study offer valuable guidance for understanding the reactivation mechanisms of similar chained ancient landslides in the geologically analogous regions of Southwest China.

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大型古滑坡的链式破坏机理研究

中国西南地区广泛分布着大规模的古滑坡，但它们的再活化机制仍然十分复杂，人们对其了解甚少。2020 年 7 月 25 日，中国重庆市武隆区刘井村发生了一起此类滑坡。该事件在不同地区和不同时间表现出不同的运动特征，最终表现为链式崩塌。本研究结合实地调查和钻探工作，通过数值模拟描述了中堡滑坡的基本特征、渗流场变化规律和稳定性。初步揭示了崩塌机理，探讨了崩塌影响因素。结果表明，滑坡的走向受地层岩性和滑动面形态的影响，在运动过程中出现了两次明显的转折。通过分析滑坡的空间形态、滑动方向、物质组成、堆积区范围和动力行为，我们将中堡滑坡划分为五个主要区域。崩塌过程可分为四个阶段：开始、剪切、加速和堆积堵塞。暴雨是滑坡的主要触发因素，而滑动面的微地形则对滑坡的破坏动力学产生了重大影响。本研究获得的启示为了解中国西南地质类似地区类似链状古滑坡的再活化机制提供了宝贵的指导。

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

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.