Differentiation characteristics and mechanism of hydraulic erosion of soil-rock mixtures with different rock contents
Hydrodynamically induced colluvial landslide is one of the main geological disasters in southwest China.It is significant to investigate the erosion differentiation mechanism of soil-rock mixtures for revealing the landslide mechanism in depth.The rock content is the most important factor affecting the erosion differentiation characteristics of soil-rock mixtures.Based on the seepage erosion tests of soil-rock mixtures with different rock content,the erosion differentiation characteristics and mechanism of soil-rock mixtures are revealed.The results show that there are four random states in the process of seepage erosion of soil-rock mixtures:erosion intensification,erosion mitigation,internal block structure reorganization and erosion stability.The rock content has a significant effect on the erosion differentiation characteristics.The permeability coefficient of soil-rock mixture increases at first,then decreases subsequently,and then increases again with the increasing rock content,and the lowest value is observed at the rock content of 60％,which was less than 1×10 2 cm/s and cause a slight fluctuation.Whereas,the permeability coefficient of soil-stone mixtures at a high rock content is nearly unchanged before and after seepage,with a change rate less than 10％.The amount of erosion increases with the increasing hydraulic gradient.On the basis of change of erosion amount,the seepage erosion is divided into three stages:violent erosion,slow erosion and stable seepage stage.The critical hydraulic gradient decreases with increasing rock content.The rock content affects the permeability of the soil-rock mixtures by affecting the filling form of the soil-rock structure,and the full-filled structure has the best impermeability,which provides ideas and references for revealing the mechanism of hydraulic instability of the colluvial slope.
万方数据
维普
