Development Characteristics and River-blocking Mechanism of a Mega-landslide in the Upper Reach of Jinsha River

WANG Jia-zhu; REN Guang-ming; GE Hua

doi:10.11988/ckyyb.20171017

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (2) : 46-51. DOI: 10.11988/ckyyb.20171017

ENGINEERING SAFETY AND DISASTER PREVENTION

Development Characteristics and River-blocking Mechanism of a Mega-landslide in the Upper Reach of Jinsha River

WANG Jia-zhu¹, REN Guang-ming², GE Hua¹

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Abstract

The secondary geological disasters induced by densely-developed landslides in the upstream of Jinsha River have severely threatened people’s livelihood and property security and the construction of reservoirs in the drainage basin. At present, however, river-blocking landslides in the Jinsha River basin, in particular, the mechanism of river blocking is rarely reported. In this paper, the development characteristics and river-blocking mechanism of a mega-landslide in the upstream of Jinsha River are investigated via drilling exploration and numerical simulation based on in-situ geological survey. Study results show that the bedrock landslide was developed on consequent and steep slope dominated by mica-quartz schist. With a total volume of 60 million m³, the landslide had blocked the Jinsha River severely, displaying an evident chair shape. The river-blocking mechanism is summarized as follows: high-speed sliding of bedding slope → collision and accumulation of front edge → pushing by the trailing edge → consolidation until damming → complete blocking of the river.

Key words

mega-landslide / landslide development / river-blocking characteristics / river-blocking mechanism / upper reach of Jinsha River

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WANG Jia-zhu, REN Guang-ming, GE Hua. Development Characteristics and River-blocking Mechanism of a Mega-landslide in the Upper Reach of Jinsha River[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(2): 46-51 https://doi.org/10.11988/ckyyb.20171017

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