Research On The Influence Of The Accumulation Of Bends On The Amplification Effect Of Slag And Debris Flow In Western Henan

Henan is a province with large mineral resources.While the mining industry plays an important role in supporting the economic development of the province,the debris flow disaster caused by unreasonable mining also has a serious impact on the safety of people’s lives and properties in the mining area.With the development of economy and the continuous development and utilization of minerals,the frequency and scale of slag and debris flows have increased significantly.In the future,the situation of mine debris flow disaster mitigation in our province will be extremely severe.It is of great practical significance to carry out research on slag-type debris flows in western Henan.Western Henan is a concentrated distribution area of mines and a high-incidence area of slag and debris flow disasters.During the mining process,a large amount of slag is piled up disorderly,occupying the channel and affecting the dynamic process of debris flow blocking and collapse,causing the amplification factor to exceed the standard value range.Accuracy of calculation results of flow rate and velocity of slag-type debris flow.Therefore,starting from the influence of curve accumulation on the dynamic process of debris flow blocking,taking Lushan and other places in western Henan as the research area,the field investigation of typical slag debris flow and outdoor curve water tank test were carried out to carry out the influence of curve accumulation on the amplification effect of slag debris flow.And the superelevation test of the curve;and the verification analysis is carried out through the combination of the field survey data and the numerical simulation.The main conclusions are as follows:(1)Through field investigation,design the "s"-shaped curved water tank model,take the semiblocking accumulation body as the main research body,change different test conditions,and discuss the relationship between the curvature radius of the curve,the bulk density of debris flow,the flow rate of debris flow and the accumulation position of the curve.Research on the influence of debris flow amplification effect.The experiment found that the larger the curvature radius of the curve,the smaller the amplification factor,the larger the upstream debris flow flow,the smaller the amplification factor,the larger the debris flow bulk density,the larger the amplification factor,and the accumulation of the concave bank is relatively blocked by changing the accumulation position of the curve.It is more obvious;and the fitting formula of the magnification factor of the slag debris flow by the accumulation of the curve is proposed.(2)In the slag and debris flow curve superelevation simulation test,through the control variable method,the relationship between the curvature radius of the curve,the debris flow bulk density and the maximum superelevation value of the curve is analyzed.The smaller the curve curvature radius is,the more obvious the curve superelevation phenomenon is.Through multiple sets of experiments,the fitting formula of the slag debris flow curve superelevation correction coefficient is obtained.(3)Through field investigation,analyze typical slag debris flow disaster cases.Substitute the data into the obtained fitting formula for verification,the deviation is small and the adaptability is better.(4)RAMMS numerical simulation software was used to establish the data model and conduct simulation analysis.From the whole simulation process,debris flow mainly moves in the process of impact,slump and blockage,and the mud depth in the downstream is larger than that in the upstream;The flow velocity increases first,then decreases and then increases again.The amplification coefficient of peak flow is not different from the actual investigation results,and the variation law is in line with the investigation.