| Mine Waste debris flow is a very prominent environmental problem in the process of mine development and construction.In the process of mining mineral resources,a large amount of mine waste accumulates in mountain gullies.With regional concentrated rainfall and special geological environment conditions,many mine waste debris flow disasters break out.This article is based on the xiao Qinling Mining area of Tongyu Town,Tongguan County,Shaanxi Province as the research object.Through investigations and research on the mine waste piles in the research area,the characteristics and disaster cultivation of the mine waste slag type mudslides in the research area is summarized.In this article,the mine waste-type mudslide starting model test,large straight shear test and rainfall of the mine waste type mudslides under the condition of different particle grades and different moisture content have explored the starting process and mechanism of the mine waste type mudslide flow,which obtained the following main conclusions:(1)The influence of different particle gradations and different water content on the starting process of mine waste debris flow is revealed.It can be divided into two cases:(1)the rolling stage and the starting stage under the unsaturated condition;(2)Coarse particle caving stage,partial discontinuous slope sliding stage and starting stage under saturated conditions.Under moderate to light rainfall intensity,the damage stages of slag debris flow can be divided into three stages:(Ⅰ)rainwater infiltration particle migration stage,(Ⅱ)slag accumulation body saturation strength reduction stage,(Ⅲ)multiple local sliding stage.(2)The influence law of different particle gradations and different water content on the starting critical condition of slag debris flow is revealed.Under the same water content,the critical starting slope of mine waste debris flow increases first and then decreases with the increase of fine particle content.There is a linear relationship between critical starting slope and moisture content of slag debris flow under the same particle gradation condition.When the fine particle content is 20%,the critical starting slope of slag debris flow decreases with the increase of water content.When the content of fine particles is 30% and 40%,the critical starting slope of slag debris flow increases with the increase of water content.(3)The optimal particle composition and water content of slag accumulation body with high stability are obtained.The optimal particle composition and water content is 20% fine particle content and 4% water content.Fine particle content 30%,moisture content 7.8%.(4)Based on the model test results,the critical starting condition of mine waste debris flow is proposed.After measuring the slope of bottom bed,moisture content and fine particle content of slag deposit body in the field,the risk of slag deposit body in mining area can be judged and predicted based on this. |
