| 川西鲜水河呷拉宗古滑坡发育特征与形成演化过程 |
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| 引用本文： | 刘筱怡,张永双,郭长宝,吴瑞安,任三绍,沈亚麒.川西鲜水河呷拉宗古滑坡发育特征与形成演化过程[J].地质学报,2019,93(7):1767-1777. |
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| 作者姓名： | 刘筱怡 张永双 郭长宝 吴瑞安 任三绍 沈亚麒 |
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| 作者单位： | 中国地质科学院地质力学研究所 ,北京 ,100081;中国地质调查局天津地质调查中心 ,天津 ,300170 |
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| 基金项目： | 本文为国家自然科学基金重点项目（编号41731287）和中国地质调查局项目(编号20190505)资助成果。 |
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| 摘 要： | 青藏高原东缘是中国乃至全球地形陡度最大、内外动力作用最强烈、天气变化极端频繁的区域,复杂的地质演化过程导致该区成为古滑坡分布最集中和复活危害最大的地区。本文以川西鲜水河断裂带呷拉宗古滑坡为研究对象,在野外调查、钻探和物探、InSAR监测、室内试验及数值模拟分析的基础上,对呷拉宗古滑坡的发育特征、形成演化过程及复活因素进行了分析研究。结果表明,①呷拉宗古滑坡形成于距今约42～30ka的晚更新世晚期,体积达3150×10~4 m~3,属巨型古滑坡;②鲜水河断裂活动是呷拉宗古滑坡形成的主控因素,历史强震的震裂效应形成古滑坡的雏形,后续的断裂蠕滑作用进一步造成坡体开裂,加剧大气降水渗入,并对裂缝有扩展作用;③SBAS-InSAR监测及数值模拟结果显示,目前该滑坡整体稳定性较好,但在多个部位存在不同程度的裂缝、陡坎及坍塌,局部变形强烈,在强震和极端降雨条件下可能发生较大规模复活滑动。建议加强采取排水和抗滑等防护措施。
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| 关 键 词： | 活动断裂 构造地貌 古滑坡 复活 InSAR监测技术 |
| 收稿时间： | 2019/1/25 0:00:00 |
| 修稿时间： | 2019/3/21 0:00:00 |
Development characteristics and evolution process of the Garazong ancient rockslide along the Xianshuihe River in western Sichuan |
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| LIU Xiaoyi,ZHANG Yongshuang,GUO Changbao,WU Ruian,REN Sanshao and SHEN Yaqi.Development characteristics and evolution process of the Garazong ancient rockslide along the Xianshuihe River in western Sichuan[J].Acta Geologica Sinica,2019,93(7):1767-1777. |
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| Authors: | LIU Xiaoyi ZHANG Yongshuang GUO Changbao WU Ruian REN Sanshao and SHEN Yaqi |
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| Institution: | 1) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081,2) Tianjin Center, China Geological Survey, Tianjin, 300170,1) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081,1) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081,2) Tianjin Center, China Geological Survey, Tianjin, 300170 and 1) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 |
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| Abstract: | The eastern margin of the Qinghai Tibet Plateau is the region with greatest topographic steepness, strongest internal and external dynamic forces, and extremely frequent climate change. The complex geological evolution process has made the region the most concentrated distribution and the most dangerous area of revival of the ancient landslides. Based on field investigation, drilling and geophysical exploration, InSAR monitoring, laboratory tests and numerical simulation analysis, this study analyzed the development characteristics, formation and evolution process and revival factors of the Garazong ancient landslide in Xianshuihe fault zone of western Sichuan. The results show that (1) The Garazong ancient landslide was formed in the late Late Pleistocene, about 42~30 ka years ago, with a volume of 3150×104 m 3, and belongs to a giant ancient landslide. (2) The Xianshuihe fault activity is the main controlling factor for the formation of Garazong ancient landslide. The cracking effect of previous strong earthquakes may result in the formation of ancient landslide and subsequent fault creeping further causes the cracking of the slopes, which increases the infiltration of atmospheric precipitation, and further expands the cracks. (3) SBAS- InSAR monitoring and numerical simulation results show that the overall stability of the landslide is good at present. But cracks, steep slopes and collapses in different degrees occur in many parts, with some suffering strong deformation, which can produce large scale revival slides due to strong earthquakes and extreme rainfall conditions. It is suggested that drainage and anti skid measures should be strengthened. |
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| Keywords: | active faults tectonic geomorphology ancient landslides reactivation InSAR monitoring technology |
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