Experimental Study On Deposition Slope Of Viscous Debris Flow Behind Check-dam

The debris flow is extremely serious in China.Morever it is one of the main natural disasters in China.The check-dam can effectively intercept sediment,release floodwater and control the supply of solid material,which is one of the common engineering measures in the prevention and constraint the debris flow.The deposition slope for the design of debris flow check-dam count a great deal,which affects the storage capacity and practical function of the check-dam.In this paper,I select deposition slope as the research object and mainly adopt flume experiment,orthogonal test and numerical simulation.Then I summarize the rules of deposition slope of vis cous debris flow behind gravity check-dam when the channel slope is 13 degrees,15 degrees,17 degrees and 19 degrees or the dam heigh is 19 cm,24cm and 29 cm or the ran-out amount is 40 L,80L and 120 L.Through the experimental study,I mainly get the following conclusions.(1)Through the orthogonal test,it is concluded that the ran-out amount of debris flow plays a leading role in the test,which has a significant influence on the result of the test and is the main factor.At the same time,the channel slope and the dam height are all significant factors,which have a certain influence on the test results.Moreover,the error of the test is so little to have obvious influence on the test results,which proves the high a ccuracy of the test design.(2)Through the flume experiment,it shows that the deposition slope of visous debris flow behind gravity check-dam is positively related with channel slope and the correlation is obvious under the certain circumstance of dam height and ran-out amount.Secondly the deposition slope of visous debris flow behind gravity check-dam is negatively related with dam height and the correlation is obvious under the certain circumstance of ran-out amount and channel slope.Finally under the certain circumstance of channel slope and dam height,the deposition slope of viscous debris flow behind gravity check-dam descrease with the ran-out amount increasing,which has obvious negative correlation.(3)Through the numerical simulation,using the Fluent software,it can simulated the deposition slope of viscous debris flow behind gravity check-dam when the density is respectively 2.0g/cm3,1.8g/cm3 and 1.6g/cm3.It can be found the deposition slope of viscous debris flow behind gravity check-dam inscrease with density increasing which has obvious positive correlation.