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。
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.
作者
张永双
巴仁基
任三绍
李宗亮
ZHANG Yongshuang;BA Renji;REN Sanshao;LI Zongliang(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,050061,Hebei,China;Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution,China Geological Survey,Shijiazhuang,050061,Hebei,China;Chengdu Center,China Geological Survey,Chengdu 610081,Sichuan,China)
出处
《中国地质》
CAS
CSCD
北大核心
2020年第6期1637-1645,共9页
Geology in China
基金
国家自然科学基金项目(41941017、41731287)
中国地质调查局项目(20190505)联合资助。
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
Landslide
suture zone mélange
unloading process
alteration
early recognition
failure modes
geo-hazard survey engineering
Jinsha River
Tibet
