Hazard mechanism analysis of Shaofang ditch waste slag debris flow in Yunnan Dongchuan district on July 31th
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Abstract:
The continuous heavy rainfall in the evening of 31 July 2008 led to the outbreak of Shaofang ditch debris flow in Yunnan Dong chuan Shekuai district, and it caused casualties and damage to roads, houses and a number of public infrastructure. The debris flow occurred in the geological environment of vulnerable mining areas，and the outbreak of debris flow was the result of interaction between unreasonable spoil pile and heavy rainfall. The rainfall conditions, terrain conditions and source conditions of debris flow were analyzed, and the starting, circulation and accumulation process of the debris flow in the Shaofang ditch were studied by field survey and test methods. The research results showed that: the loose residue source and strong rainfall were the main reasons for the occurrence of debris flow of Shaofang Ditch. Judging from the trend，the Shaofang ditch debris flow was at the stage of development, and the possibility of the outbreak of debris flow still existed. According to the characteristics of debris flow, the following measures were put forward, and these measures were stopping and supporting, combined with dam energy dissipation, vegetation restoration,;timely dredging, real-time monitoring, and disaster early-warning.
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