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植物对边坡稳定性的贡献源于根系对土体的加劲作用、根系吸水消耗孔隙水压力及其引起的抗剪强度增加.通过对非饱和含根土开展剪切试验建立了根-土复合体的抗剪强度模型,其抗剪强度是根系密度和土壤含水率的函数.通过建立二维根系吸水模型,开展根系吸水条件下的渠道边坡土壤水分运动数值模拟.根据土壤水分动态分布和根-土复合体抗剪强度模型计算了不同气象阶段植被渠道边坡的稳定性.对比相同时刻植被边坡和裸土边坡的稳定性计算结果发现,植物根系通过加劲土壤和吸取土壤水分能够显著增强黄土渠道边坡的稳定性.
The contribution of plant to the stability of the slope stems from the stiffened effect of the root system on the soil and the increase of the pore water pressure caused by water absorption by the root and the increase of the shearing strength caused by the soil.The root-soil composite The shear strength of body is a function of root density and soil water content. By establishing a two-dimensional root water absorption model, the numerical simulation of soil water movement under channel water absorption is carried out. According to the dynamic distribution of soil moisture and Root-soil composite shear strength model was used to calculate the stability of vegetation channel slope in different meteorological stages.Comparing the stability calculation of vegetation slope and bare soil slope at the same time, it was found that plant roots can absorb soil moisture Significantly enhance the stability of loess channel slope.