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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。
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.
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Key words:
- Landslide /
- suture zone mélange /
- unloading process /
- alteration /
- early recognition /
- failure modes /
- geo-hazard survey engineering /
- Jinsha River /
- Tibet
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表 1 金沙江中下游奔子栏至大理段蚀变岩的工程特性测试结果（据张永双等，2007）
Table 1. Test results of engineering properties of altered rocks in Jinsha River tectonic belt from Benzilan to Dali (after Zhang Yongshuang et al., 2007)
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表 2 巴塘水电站坝址区边坡卸荷带水平深度（据吴龙科，2015）
Table 2. Horizontal depth of slope unloading zone in the dam area of Batang Power Station(after Wu Longke, 2015)
下载: 导出CSV
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