Effects Of Runoff Regulation And Control Technology On Slope Flow Storage Capacity And Stability

Runoff regulation and control technology of micro-topography modification can affect the underlying surface of slope,and then cause the change of slope flow storage capacity and stability.At present,there are many regulation measures for the micro-topography of slope,but the research on its flow storage capacity and stability is not perfect.The purpose of this study was to analyze the flow storage capacity of the five micro-terrain regulation technologies through outdoor simulated rainfall test and fit them with the empirical model.The fluid-solid coupling model was established by numerical simulation software to analyze the stability of three typical slopes,so as to provide theoretical reference for the engineering application of the five micro-terrain regulation technologies.Research findings:(1)With the increase of rainfall intensity,5 kinds of measures of runoff by bare slope>intercepting ditch=pool pit>straw>zeolite changes for bare slope>intercepting ditch=pool pit>straw>zeolite,interflow by intercepting ditch=gathered flow pit>straw>bare slope>zeolite changes for straw>intercepting ditch=pool pit>bare slope>zeolite,infiltration rate by zeolite>intercepting ditch=gathered flow pit>straw>bare slope changes for zeolite>straw>intercepting ditch=pool pit>bare slope;With the increase of slope,the runoff,soil flow and infiltration rate of the five measures presented the same change rule.lt can be seen that,compared with the bare slope,the other four micro-topographic reconstruction measures can enhance the flow storage capacity of the slope surface,but with the increase of the rain intensity,the flow storage effect of the drainage pit and intercepting ditch turns from better than straw to weaker than straw.In addition,zeolite improved slope flow storage effect is the best.(2)Horton infiltration formula was used to fit the infiltration rate,and the correlation coefficient between the simulated value and the actual value was greater than 0.9.Based on the principle of water balance,a slope runoff model suitable for this study was established and verified according to the rainfall data.The correlation coefficient between the simulated value and the actual value was greater than 0.9.Fluid-solid coupling model shows that after the placement of micro-topography measures on the slope,the internal pore water pressure and the safety factor of the slope do not change significantly,and the safety factor of the slope increases slightly after the zeolite modification,indicating that the application of micro-topography modification measures will not damage the stability of the slope.(3)When natural zeolite was used to improve the soil,the internal friction Angle and cohesive force of the soil first increased and then decreased with the increase of the content of the mixture.The soil internal friction Angle first increases and then decreases with the increase of water content,but the value does not change much,and the soil cohesion decreases with the increase of water content,showing a negative correlation.This indicates that natural zeolite can improve the shear strength of soil,and the optimal mixing ratio is 10%,which can be applied to engineering practice.