利用遥感和三维数值建模技术了解 2017 年巴塔哥尼亚安第斯山脉圣卢西亚山崩的破坏机制

IF 5.8 2区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Jaspreet Singh, Sergio A. Sepúlveda
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引用次数: 0

摘要

在高山环境中,大型岩崩的发生往往会导致灾难性的泥石流。外部因素可能会引发与脱冰期相关的破坏所产生的运动学条件相符合的不连续相交块体,从而导致大规模岩崩,对下游造成重大危害。本研究利用遥感和数值建模技术,对 2017 年智利巴塔哥尼亚安第斯山脉圣卢西亚山体滑坡的破坏机制和演变过程进行了全面分析。由于地处偏远,研究人员利用航空摄影测量来揭示结构和地貌构造,并确定了四组不连续性。根据彩色阴影浮雕和斜坡运动学分析,发现崩塌是由三个不同的不连续性组合造成的。在坡顶部分,由于平面和楔形面的形成,导致了复杂的破坏;而在坡脚区域,破坏则是由垫层和其他接合组之间的楔形形成所决定的。为进一步研究其机理和演变过程,在 3DEC 中开发了刚性块数值模型,以真实地形和连接参数重现破坏过程。在发生实际破坏的同一地形区域观察到了最大位移,从而证实了不连续在灾难性破坏演变过程中的作用。由于岩石损坏导致强度降低,模拟斜坡增加了不稳定性,导致沿粘合面的位移增大,与现场观察到的属性相似。我们讨论了遥感和三维数值建模相结合的详细方法,以便详细了解滑坡的破坏机制。总之,我们的研究结果表明,Santa Lucía岩石滑坡是一种受结构控制的崩塌,在这种情况下,接缝提供了运动自由度,而由于脱冰蚀作用造成的长期岩石斜坡破坏则有利于这种自由度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Understanding the failure mechanisms of the 2017 Santa Lucía landslide, Patagonian Andes, using remote sensing and 3D numerical modelling techniques

Understanding the failure mechanisms of the 2017 Santa Lucía landslide, Patagonian Andes, using remote sensing and 3D numerical modelling techniques

The occurrences of large rock slides often result in catastrophic debris flow within high mountain environments. Discontinuity intersected blocks meeting kinematic conditions stemming from deglaciation-related damage can be triggered by external factors, leading to massive rock slides with a significant downstream hazard. This study presents a comprehensive analysis underlining the mechanism and evolution of the failure during the 2017 Santa Lucía landslide, Patagonian Andes, Chile, utilizing remote sensing and numerical modelling. Due to the remote location, aerial photogrammetry was used to unravel the structural and geomorphological configuration, and four discontinuity sets were identified. Based on colour-shaded relief and slope kinematic analysis, it was found that the failure is governed by combinations of three different discontinuity sets. The failure in the crown portion is complex due to resulting planar and wedge surfaces, whereas in the toe region, the failure is governed by the wedge formation between bedding and other joint set. To further examine its mechanism and evolution, rigid block numerical models were developed in 3DEC to reproduce the failure with real topography and joint parameters. The maximum displacement was observed in the same topographical region where the actual failure occurred, thus conforming to the role of discontinuities in the evolution of the catastrophic failure. Acting on a reduced strength due to rock damage, the modelled slope boosts the instability leading to higher displacements along bonding surfaces with similar attributes as observed in the field. A detailed methodology is discussed regarding coupling remote sensing and 3D numerical modelling for detailed insights into the failure mechanism of the landslides. Overall, our results demonstrate that the Santa Lucía rock slide is a structurally controlled failure where joints provided kinematic freedom, favoured by long-term rock slope damage due to deglaciation.

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来源期刊
Landslides
Landslides 地学-地球科学综合
CiteScore
13.60
自引率
14.90%
发文量
191
审稿时长
>12 weeks
期刊介绍: Landslides are gravitational mass movements of rock, debris or earth. They may occur in conjunction with other major natural disasters such as floods, earthquakes and volcanic eruptions. Expanding urbanization and changing land-use practices have increased the incidence of landslide disasters. Landslides as catastrophic events include human injury, loss of life and economic devastation and are studied as part of the fields of earth, water and engineering sciences. The aim of the journal Landslides is to be the common platform for the publication of integrated research on landslide processes, hazards, risk analysis, mitigation, and the protection of our cultural heritage and the environment. The journal publishes research papers, news of recent landslide events and information on the activities of the International Consortium on Landslides. - Landslide dynamics, mechanisms and processes - Landslide risk evaluation: hazard assessment, hazard mapping, and vulnerability assessment - Geological, Geotechnical, Hydrological and Geophysical modeling - Effects of meteorological, hydrological and global climatic change factors - Monitoring including remote sensing and other non-invasive systems - New technology, expert and intelligent systems - Application of GIS techniques - Rock slides, rock falls, debris flows, earth flows, and lateral spreads - Large-scale landslides, lahars and pyroclastic flows in volcanic zones - Marine and reservoir related landslides - Landslide related tsunamis and seiches - Landslide disasters in urban areas and along critical infrastructure - Landslides and natural resources - Land development and land-use practices - Landslide remedial measures / prevention works - Temporal and spatial prediction of landslides - Early warning and evacuation - Global landslide database
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