长江三峡库区谭家湾滑坡基本变形特征及机理分析

doi:10.11988/ckyyb.20191255

长江科学院院报 ›› 2021, Vol. 38 ›› Issue (1): 78-83.DOI: 10.11988/ckyyb.20191255

长江三峡库区谭家湾滑坡基本变形特征及机理分析

张富灵^1,2,3, 邓茂林^1,2,3, 周剑^1,2,3, 李卓骏^1,2,3, 林琰^1,2,3

1.三峡大学湖北省地质灾害防治工程技术研究中心,湖北宜昌 443002;
2.三峡大学防灾减灾湖北省重点实验室,湖北宜昌 443002;
3.三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌 443002

收稿日期:2019-10-16 修回日期:2019-12-13 出版日期:2021-01-01 发布日期:2021-01-27
通讯作者: 邓茂林(1980-),男,四川达州人,讲师,博士,研究方向为地质灾害预防与防治。E-mail:dmltop@163.com
作者简介:张富灵(1995-),男,四川巴中人,硕士研究生,研究方向为地质灾害预防与防治。E-mail:fulingzhang@ctdu.edu.cn
基金资助:
国家重点研发计划项目(2018YFC1504803);国家青年科学基金项目(41701013,41807294);湖北省自然科学基金面上项目(2018CFB654);三峡大学硕士学位论文培优基金项目(2020SSPY018)

Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area

ZHANG Fu-ling^1,2,3, DENG Mao-lin^1,2,3, ZHOU Jian^1,2,3, LI Zhuo-jun^1,2,3, LIN Yan^1,2,3

1. Hubei Center of Geological Disaster Control, China Three Gorges University, Yichang 443002, China;
2. Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang443002, China;
3. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry ofEducation, China Three Gorges University, Yichang 443002, China

Received:2019-10-16 Revised:2019-12-13 Published:2021-01-01 Online:2021-01-27

摘要/Abstract

摘要： 三峡库区谭家湾滑坡自2006年实施专业监测以来,一直持续变形,尤其是自2015年以来,变形趋势逐年增大,对库区村民的生命、财产安全造成巨大威胁。根据长期的野外地质调查、宏观巡查、滑坡地表裂缝位移自动监测数据以及12余年的人工GPS监测数据等,分析了该滑坡在强降雨和库水位变化条件下的基本变形特征和变形机理。结果表明:谭家湾滑坡属于中厚层圈椅状的降雨型牵引式土质滑坡,强降雨和持续性降雨是影响滑坡变形的主要外因,库水位变动对谭家湾滑坡影响较小。谭家湾滑坡在持续性降雨和强降雨条件下会产生明显响应,当日降雨量>90 mm或前3 d累计降雨量达到50 mm,并且当日和前1 d降雨量均>15 mm,地表裂缝位移-时间曲线、累计位移-时间曲线会出现明显的阶跃现象。目前,谭家湾滑坡变形趋势逐年增大,边界裂缝基本形成,在强降雨等极端条件下产生滑动的可能性很大,必须进一步加强监测。

关键词: 降雨型滑坡, 变形特征, 阶跃曲线, 滑坡形成机理, 谭家湾滑坡

Abstract: Since the implementation of professional monitoring in 2006, the Tanjiawan landslide in the Three Gorges reservoir area has seen a continuously increasing displacement. Especially since 2015, the deformation trend has intensified, posing a great threat to the lives and property safety of villagers in the reservoir area. According to long-term field geological survey, macroscopic inspection, automatic monitoring data of landslide surface crack displacement and artificial GPS monitoring data for over 12 years, we examined the basic deformation characteristics and deformation mechanism of the landslide under heavy rainfall and reservoir water level fluctuation. Results suggest that the Tanjiawan landslide is a rainfall-triggered retrogressive landslide with medium-thick layer chair-shaped groove shape. Heavy rainfall and continuous rainfall are major external factors affecting landslide deformation, while water level fluctuation has little effect. Heavy rainfall and continuous rainfall led to evident response: when daily rainfall exceeds 90 mm or the accumulated rainfall of previous three days reaches 50 mm while rainfall on the same day and the previous day exceeds 15 mm, the surface crack width-time curve and the cumulative displacement-time curve will witness an apparent step upward. At present, the deformation of Tanjiawan landslide is increasing year by year, with boundary cracks basically formed. It is highly probable that sliding will occur under extreme conditions such as heavy rainfall. Automatic monitoring equipment and detail inspection must be strengthened.

Key words: rainfall-induced landslide, deformation characteristics, step curve, landslide formation mechanism, Tanjiawan landslide

中图分类号:

P642.22

张富灵, 邓茂林, 周剑, 李卓骏, 林琰. 长江三峡库区谭家湾滑坡基本变形特征及机理分析[J]. 长江科学院院报, 2021, 38(1): 78-83.

ZHANG Fu-ling, DENG Mao-lin, ZHOU Jian, LI Zhuo-jun, LIN Yan. Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area[J]. Journal of Yangtze River Scientific Research Institute, 2021, 38(1): 78-83.

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长江三峡库区谭家湾滑坡基本变形特征及机理分析

Basic Deformation Characteristics and Mechanism of Tanjiawan Landslide in the Three Gorges Reservoir Area

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