颗粒级配对矿渣型泥石流启动影响的机理研究

The Influence Mechanism of Grain Gradation on Initiation of Slag Type Debris Flows

为了探究颗粒级配对矿渣型泥石流启动影响的机理,以陕西省潼峪金矿区内4条泥石流沟为研究对象,通过现场调查、室内试验和数值模拟,揭示了颗粒级配对矿渣型泥石流启动过程的影响机理。结论如下:随着细颗粒含量的增加,矿渣的抗剪强度、渗透性均呈降低趋势,且饱和状态影响程度更为显著;借助室内实验和数值实验获得了各型级配矿渣的宏观参数和细观参数;矿渣的颗粒级配通过改变渣体的抗剪强度和渗透性,进而影响到矿渣受力情况和结构破坏模式,最终来影响矿渣型泥石流的启动难易程度。

In order to study the mechanism of the influence of particle size on the start-up of slag debris flow,we took four debris flow gullies in Tongyu gold mining area of Shaanxi Province as the research objects.Through field investigation,laboratory test and numerical simulation,we revealed the mechanism of the influence of particle size on the start-up process of slag debris flow.The main conclusions reached are as follows:with the increase of fine particle content,the shear strength and permeability of slag decrease,and the effect of saturation state is more significant;the macro and microcosmic parameters of each grading slag are obtained by laboratory and numerical experiments;the grain grading of the slag can change the shear strength and the permeability of the slag body,and then influence the stress condition and the structure failure mode of the slag,and finally influence the start-up difficulty of the slag-type debris flow.