%0 Journal Article
%A WANG Jia-zhu
%A REN Guang-ming
%A GE Hua
%T Development Characteristics and River-blocking Mechanism of a Mega-landslide in the Upper Reach of Jinsha River
%D 2019
%R 10.11988/ckyyb.20171017
%J Journal of Yangtze River Scientific Research Institute
%P 46-51
%V 36
%N 2
%X 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 m<sup>3</sup>, 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.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20171017