Anti-erosion Model Test Study on New Type of Vegetation-growing Cement Soil Filled in Slope Lattices
To explore the effect of filling type and vegetation cover on soil and water conservation for slope lattices,and to promote the intensive use of engineering disposal soil,the rainfall model tests were carried out with different rainfall intensities,slope gradients,and filling types,i.e.,pure disposal soil layer,disposal soil layer+vegetation cover,cemented soil layer,cemented soil layer+vegetation cover.The runoff,erosion,and rainfall infiltration rule of various filling layers were analyzed.The contribution of vegetation rainfall interception and filling top layer cement solidification to controlling soil erosion and enhancing soil anti-scour were studied.The result indicates that the influence of rainfall intensity on runoff rate and erosion modulus is greater than the slope gradient.The rainfall infiltration rate of pure disposal soil layer tends to increase and then decrease with the increases of both rainfall intensity and slope gradient.Compared with the pure disposal soil layer,the runoff and erosion process are more stable at the solidified soil layer,and the effect of surface curing in mitigating rainwater infiltration is more significant than that of vegetation cover.The rainfall interception effect of vegetation stems and leaves is relatively dominant when vegetation is dense at the pure disposal soil layer.The role of plant pores in promoting slope runoff infiltration is relatively dominant when vegetation is dense at the solidified soil layer.Compared with the pure disposal soil layer,the soil erosion can be reduced by more than 98%after vegetation restoration by using the new type of vegetation-growing cement soil technology.The new type of vegetation-growing cement soil for slope lattices has good soil and water conservation characteristics,which can be used for conservation of rock slopes and rock desertification slopes.
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