基于SBAS-InSAR技术的澜沧江哑贡倾倒体变形演化特征

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摘要为研究我国西南深切河谷地区倾倒变形体变形演化特征，以澜沧江上游某大型水电站泄洪出口区附近的哑贡倾倒变形体为例，在现场地质调查的基础上，利用SBAS-InSAR技术分析2021年1月至2023年4月期间共53景Sentinel-1A升轨SAR影像数据，并结合高清卫星影像、高精度数字高程数据、地表形变监测、降雨监测等数据，深入研究哑贡倾倒变形体的变形演化特征。结果表明：(1) 哑贡倾倒变形体目前处于持续加速变形阶段，研究期间年变形速率介于－49.96～－0.70 mm/y范围，累计最大形变量为－106.97 mm，极强和强变形区域主要集中在海拔2 400 m以上区域，占比高达42.75%；(2) 雨季的地表月平均变形量是旱季的1.71倍，持续降雨对促进斜坡变形的发展是较为突出的因素之一；(3) 受澜沧江及木水河双向下切、地质构造及地层岩性的控制，岩体倾倒变形具有明显的时空差异性，主要表现为地表变形量随海拔的上升而增加，且澜沧江侧岩体变形量大于木水河侧；(4) 研究区中部的玄武岩有效降低了斜坡下部板岩、砂岩的整体变形速率，岩体在纵向上的“软岩–硬岩–软岩”这一岩层分布特征对提高斜坡稳定性起到了重要作用。

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	罗军尧1
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	朱国金3
	冯业林1
	向天兵1
	陈光明1
	黄青富1
	杨旸1
	杨太强1

关键词 ：边坡工程, 倾倒变形体, SBAS-InSAR, 层状岩体, 形变监测, 变形演化特征

Abstract：In order to understand the deformation evolution characteristics of toppling deformation bodies in deep-cut river valleys of southwestern China，this paper presents a case study of the Yagong toppling deformation，located near the spillway outlet of a large hydropower station in the Upper Lancang River. Based on field investigation，the SBAS-InSAR technique was used to analyze 53 scenes of ascending Sentinel-1A SAR images from January 2021 to April 2023. Combined with high-definition satellite images，high-resolution digital elevation data，surface deformation monitoring and rainfall data，an in-depth study of the deformation characteristics and evolution mechanism of the Yagong toppling deformation was carried out. The results indicate that：(1) The Yagong toppling deformation is currently in a continuous acceleration stage，with an annual deformation rate ranging from －49.96 mm/y to －0.70 mm/y during the SAR image period，and a cumulative maximum deformation amount of －106.97 mm. The areas of extremely strong and strong deformation are primarily concentrated in regions above 2 400 m a.s.l.，accounting for as much as 42.75% of the total affected area. (2) The monthly average surface deformation during the rainy season is 1.71 times greater than that of the dry season，highlighting that continuous rainfall is one of the most prominent factors in promoting slope deformation development. (3) Controlled by the incision caused by the Lancang River and Mushui River，as well as variations in geological structures and lithology，the toppling deformation shows significant temporal and spatial differences. This primarily manifests as increasing surface deformation with altitude，and greater deformation on the flank of the Lancang River compared to the flank of the Mushui River. (4) The presence of the basalt in the middle part of the slope effectively reduces the overall deformation rate of the underlying slate and sandstone. The soft-hard-soft rock distribution in the study area plays a crucial role in enhancing slope stability.

Key words： slope engineering toppling deformation body SBAS-InSAR layered rock mass deformation monitoring deformation evolution characteristics

引用本文:

罗军尧1，2，朱国金3，冯业林1，向天兵1，陈光明1，黄青富1，杨旸1，杨太强1. 基于SBAS-InSAR技术的澜沧江哑贡倾倒体变形演化特征[J]. 岩石力学与工程学报, 2024, 43(12): 3018-3031.
LUO Junyao1，2，ZHU Guojin3，FENG Yelin1，XIANG Tianbing1，CHEN Guangming1，HUANG Qingfu1，YANG Yang1，YANG Taiqiang1. Deformation evolution characteristics of the Yagong toppling body in the Lancang River based on SBAS-InSAR technology. , 2024, 43(12): 3018-3031.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/3018

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