利用 InSAR 技术研究溪洛渡水库水位波动条件下下倾和反下倾阶梯斜坡两种类型顶板的变形趋势

IF 5.8 2区 工程技术 Q1 ENGINEERING, GEOLOGICAL Landslides Pub Date : 2024-01-16 DOI:10.1007/s10346-023-02197-2
Lingjing Li, Baoping Wen, Xin Yao, Kaiyu Ren, Yifei Zhu
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引用次数: 0

摘要

倾覆是陡基岩斜坡最常见的变形类型之一。随着大江大河高坝的兴建,库区出现了各种倾覆变形,而倾覆变形如何随长期水位波动而变化,目前尚不清楚。为了识别下倾式垫层和反倾式垫层斜坡两种类型的顶板变形特征以及对水位波动的不同响应,我们基于水库蓄水后 8 年的哨兵-1合成孔径雷达数据,采用了叠加干涉合成孔径雷达(stacking-InSAR)和小基线子集合成孔径雷达(SBAS-InSAR)技术。最初,蓄水后局部变形的顶板和后来变形的顶板都表现出完全变形。根据 SBAS-InSAR 的堆叠-InSAR 变形剖面和典型永久散射(PS)点的变形特征,星光山祖(XGSZ)和岩湾(YW)的倾覆失稳均可划分为两个变形区。根据年堆叠-InSAR结果和两个倾覆区的变形速率,XGSZ倾覆失稳的变形模式为后退型,YW倾覆失稳的变形模式为前进型。裂缝分布与地表变形和边坡地形有关,主要张裂缝与 InSAR 揭示的大变形区非常一致。从长期变形来看,XGSZ 的倾覆失稳主要是水库蓄水前的前缘坍塌,在第一次蓄水后转变为整体变形,而 YW 的倾覆失稳则是在蓄水后发生变形。在蓄水后的头 3 年,XGSZ 倾覆不稳定带的变形面积扩大速度快于 YW 倾覆不稳定带。在与水位波动的关系方面,SBAS-InSAR 的研究结果表明,水位下降对 YW 坡顶不稳定的影响比对 XGSZ 坡顶不稳定的影响更为显著。受水位波动影响的 YW 坡顶不稳定状态的标高高于 XGSZ 坡顶不稳定状态的标高,推测是斜坡中部断层断裂带的强导水性影响了 YW 坡顶不稳定状态的变形。
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Deformation trends of two types of toppling in underdip and anti-dip bedding slopes under water-level fluctuations in the Xiluodu Reservoir using InSAR technology

Toppling is among the most common deformation types in steeply bedded rock slopes. With the construction of high dams in large rivers, various toppling deformations have occurred in reservoir areas, and it is still unclear how toppling deformation varies with long-term water-level fluctuations. To identify the deformation characteristics and different responses to the water-level fluctuations of the two types of toppling in underdip bedding and anti-dip bedding slopes, stacking interferometric synthetic aperture radar (stacking-InSAR) and small baseline subset InSAR (SBAS-InSAR) technologies were used based on Sentinel-1 SAR data from 8 years following reservoir impoundment. Initially, topplings that deformed locally after impoundment and those that deformed later exhibited complete deformation. According to the stacking-InSAR deformation profile and the deformation characteristics of typical permanent scatter (PS) points from SBAS-InSAR, both Xingguangsanzu (XGSZ) and Yanwan (YW) toppling instabilities can be divided into two deformation zones. According to the annual stacking-InSAR results and the deformation rates of the two zones of topplings, the deformation mode of the XGSZ toppling instability was retrogressive and that of the YW toppling instability was progressive. The crack distributions were related to the surface deformation and the slope topography, and the main tension cracks were very consistent with the large deformation area revealed by InSAR. In terms of long-term deformation, the XGSZ toppling instability mainly suffered from collapse of the front edge before reservoir impoundment, which turned into overall deformation after the first impoundment, while the YW toppling instability deformed after impoundment. The deformation area of the XGSZ toppling instability expanded faster than that of the YW toppling instability in the first 3 years after impoundment. Regarding the relationship with water-level fluctuations, the SBAS-InSAR results showed that the impact of water-level drawdown on the YW toppling instability was more significant than that on the XGSZ toppling instability. The elevation of the YW toppling instability affected by water-level fluctuations was higher than that of the XGSZ toppling instability, and it was speculated that the strong water conductivity of the fault fracture zone in the middle of the slope affected the deformation of the YW toppling instability.

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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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