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引用本文:张永双,巴仁基,任三绍,李宗亮. 中国西藏金沙江白格滑坡的地质成因分析[J]. 中国地质, 2020, 47(6): 1637-1645.
ZHANG Yongshuang,BA Renji,REN Sanshao,LI Zongliang. An analysis of geo-mechanism of the Baige landslide in Jinsha River, Tibet[J]. Geology in China, 2020, 47(6): 1637-1645(in Chinese with English abstract).
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中国西藏金沙江白格滑坡的地质成因分析
张永双1,2, 巴仁基3, 任三绍1,2, 李宗亮3
1.中国地质科学院水文地质环境地质研究所, 河北 石家庄 050061;2.中国地质调查局第四纪年代学与水文环境演化重点实验室, 河北 石家庄 050061;3.中国地质调查局成都地质调查中心, 四川 成都 610081
摘要:
2018年10月11日发生的金沙江白格滑坡是中国西藏继2000年易贡滑坡以来社会影响最大的滑坡事件。许多学者对该滑坡的形成条件、稳定性和监测预警等进行了研究报道,但对滑坡的地质成因研究比较薄弱。本文在区域地质分析、现场调查测绘和综合研究的基础上,重点从断裂作用控制斜坡岩体结构、水与蚀变软岩夹层作用促进结构面弱化、卸荷作用控制滑坡规模和失稳方式等方面,提出了金沙江构造缝合带混杂岩体岸坡在持续重力作用下的失稳机理,对金沙江沿岸滑坡隐患早期识别和风险防控具有一定指导意义。
关键词:  滑坡  缝合带混杂岩  卸荷作用  蚀变作用  早期识别  破坏模式  地质灾害调查工程  金沙江  西藏
DOI:10.12029/gc20200603
分类号:P642.22
基金项目:国家自然科学基金项目(41941017、41731287)和中国地质调查局项目(20190505)联合资助。
An analysis of geo-mechanism of the Baige landslide in Jinsha River, Tibet
ZHANG Yongshuang1,2, BA Renji3, REN Sanshao1,2, LI Zongliang3
1.Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, Hebei, China;2.Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution, China Geological Survey, Shijiazhuang, 050061, Hebei, China;3.Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China
Abstract:
On October 11, 2018, Baige landslide occurred in the upper reaches of the Jinsha River, and this was the most influential landslide event in Tibet since the Yigong landslide in 2000. The formation conditions, stability, monitoring and early warning of the landslide have been studied and reported by many experts, but the geo-mechanism of landslide has seldom been studied. On the basis of regional geological analysis, field survey, mapping and comprehensive research, the authors put forward the failure mechanism of the bank slope of the mélange in the Jinsha River structural suture zone under the sustained gravity, which mainly considers such factors as the structure of slope rock mass controlled by fracture, the weakening of the structural plane by the action of water and weak altered interlayer, and the scale and failure mode of the landslide controlled by unloading. The results have certain guiding significance for early recognition of potential landslide and risk prevention and control along the Jinsha River.
Key words:  Landslide  suture zone mélange  unloading process  alteration  early recognition  failure modes  geo-hazard survey engineering  Jinsha River  Tibet