Erosion Process Of Slope Surface Of Red Soil Engineering Sediment Transport Mechanism

Deposit in southern red soil area production and construction projects as the main research object,to the guanzhong plain deposit soil and in contrast,in the traditional slope erosion simulation washout process monitoring method and laser particle size analysis method,combining with slope surface erosion process on the premise of erosion and sediment particle size distribution,reveal the clay deposit slope mechanical properties and water sediment distribution along the slope surface erosion The distribution law of erosion and sediment particles and the characteristics of sediment particles were investigated.Test in southern red clay and the guanzhong plain soil as the basic material,respectively analysis in different water intensity(8 l/min,12 l/min,16 l/min,20 l/min),different slope(28 °,32 °,36 °)factors under the deposit of the project and slope erosion and sediment transport process and the impact of particle composition change rule,clarify two underlying surface slope surface runoff in the separation characteristics of sediment particles,establish quantitative deposit slope erosion and sediment particles carrying capacity The preliminary conclusion is as follows:(1)the clay,deposit soil engineering and slope runoff rate sustained over time are presented after the first increase volatility trends,slope gradient and water flow rate have significant influence on changes in the rate of runoff process,slope runoff yield rate are increased with the increase of water flow rate increases,but the red crops early spurt flow rate range is less than the soil,big red crops under the condition of traffic flow rate volatility a soil,and(min)is produced in the late water flow rate Clay,slope surface cumulative production flow and are in a functional relationship,the flushing time under the same condition of slope,the slope cumulative production flow rate increases with the increase of water flow and,under the same condition of water flow,the slope cumulative production between flow rate and slope gradient change trend,big slope under the condition of traffic,the clay soil cumulative production traffic growth.(2)the clay,deposit soil slope sediment yield rate with water over the continuation of the trend of the "peak valley" more of the same slope under the condition of two kinds of slope with the increase of water flow,as a whole tend to increase gradually,a slope surface,red the first part of the slope surface erosion and sediment yield rate volatility,the corresponding water flow under the condition of red soil surface sediment yield as a whole The cumulative sediment yield of soil slope is a function of the time of scouring.Under the condition of the same grade,clay and slope surface accumulated sediment yield rate with all water flow rate increases,but under the condition of same water flow,the clay cumulative sediment yield rate and slope gradient,a trend of gradual increase in between and soil accumulation between sediment yield rate and slope gradient increases after the first In the same slope,under the same water flow rate,the cumulative sediment yield of soil accumulation is greater than that of red soil accumulation.(3)the flow velocity of soil slope on the soil slope was reduced after decreasing,and the slope velocity was close to half or even.In the process of erosion,the Reynolds number of two slopes is gradually changed from small to large.Reynolds number increases with the increase of flow rate,and the change of Reynolds number is greatly influenced by runoff,and there is a good power function relationship between Reynolds number and water release time.Clay,deposit soil slope froude number as a continuation of the runoff time,general flat after rapid decrease first,in the current 0 ~ 10 min,for rapid decrease stage,overland flow state of rapids,in runoff yield 10 ~ 45 min,froude number stable stage,overland flow as the flow state,froude number and the flush time between a good power function Experimental conditions,two kinds of slope surface Darcy-weisbach resistance coefficient and good power function relationship between the water time,among them,the red soil slope surface Darcy-weisbach overall drag coefficient between 0.013 ~ 0.013,deposit soil and Darcy-weisbach overall drag coefficient between 0.011 ~ 0.011,both slope with the increase of water flow resistance coefficient change interval(4)the clay,slope surface erosion and sediment particles in silt are dominant,not less than 50%,the proportion of red clay in the slope surface rolls for grain(30% ~ 36%)is greater than the slope surface(21% ~ 29%),sand percentage,at least the clay between 2.4% ~ 4.85%,while e a ?? soil in ~ 6% Under different gradient and different flow rate,the enrichment rate of the clay particles in the erosion sediment particles is greater than 1(enrichment),and the sand grains are less than 1(deposit).Under two kinds of bedding surface,the small particles are eroded and eroded,and the enrichment occurs,while the large particles are not easy to be transported.Two kinds of underlying surface enrichment ratio of clay with the increase of the water flow was significantly increased after first reduce the trend,change of silt accumulation rate are smaller and sand accumulation rate changing with flow trend in contrast to the clay was significantly reduced after first increased(P < 0.05);In addition,the concentration ratio of soil clay and silt was significantly larger,and the concentration ratio of sand grains was significantly smaller,indicating that the soil erosion was more than that of soil erosion.(5)the clay,clay in the soil erosion and sediment particles of E/U(enrichment rate)on the whole are all less than 1,the silt E/U value the overall are approximately equal to 1,and E/U value of grains of sand on the whole is greater than 1,erosion and sediment particles in clay and sand handling,easy to aggregate form been runoff and the sand was mainly in the form of single grain At the same time,two kinds of underlying surface,the clay E/U value with the increase of the water flow was significantly increased after lower first,silt E/U value(a)enrichment rate change is small,and the sand E/U value changing with flow trend in contrast to the clay was significantly increased after first was decreased(P < 0.05);Clay a slope surface,the slope,flow rate,the clay,silt and sand E/U value significantly smaller,as a whole are more close to 1,at the same time,the red clay are greatly influenced by water flow,its various graded with water lasted significantly under each traffic wave.