The Slope Stability Analysis Of Urban River With Near Natural Revetment

As the rapid economic development and environmental degradation, the near natural control measures become a hot topic of research at home and abroad in riparian remediation. This paper researched slope stability in the Chang shou District, Chongqing Tao hua xi about vegetation revetment measures, natural material fabric cushion revetment measures, geotextiles flat bag revetment measures designed to evaluate applicability of the near-natural revetment measures.1. The critical value model of the slope stability slope was deduced from soil shear strength: and some sorts of places slope stability was evaluated by this model. Slope stability mechanics analysis method in general engineering(Sweden slice method, Bishop method, Janbu method), and was analysed slope stability from the mechanical point of view. The result showed that the above three kinds of near natural bank protection measures could improve the erosion resistance of the bank slope and the stability of the slope physical science, while improving the biodiversity of revetment. Vegetation revetment and plots were the most obvious to improve the effect. From the point of view of biodiversity, the root distribution characteristics, undisturbed soil erosion resistance, soil particles disintegration, soil properties and holding capacity of soil water, using principal component analysis analyzed all sorts of erosion resistance. When the bank slope gradient was45°, stabilize the slope threshold of the revetment of vegetation kind, natural materials, fabric mat revetment Likewise, geotextile flat bag revetment were respectively2.21times and2.13times,1.68times higher than control plots. The river design software Macral was applied to analysis slope stability, the results showed that:when the river flows up to10times the average annual flow, the bank slope can still remain stable.2. Bbiological diversity of all sorts of places, the root distribution characteristics were analyzed, the results indicated that:near natural bank protection measures can enhance biodiversity and soil in the root content, so the bank slope is easier to resist the raindrops hitting the runoff erosion, and enhance the stability of bank slope.3. Using principal component analysis to study all sorts of anti-erosion comprehensively. It is concluded that, natural materials, fabric mat revetment (0.261)> the vegetation revetment (0.119)> the geotextile flat bag revetment (-0.050)> control plots (-0.090). The revetment kind of vegetation, natural materials, fabric mat revetment sample showed strong bank slope stability (corrosion resistance).4. Soil water storage, soil permeability were selected as indicators to study the resistance to water erosion from the perspective of the effect of soil water. The results showed that the vegetation bank protection measures, natural materials, fabric pad bank protection measures, geotextile bags flat revetment measures can improve the bank slope soil water storage and permeability, which can improve Slope Stability.5. Slope Stability and dry sieving aggregates, wet sieving aggregates, microaggregates larger particle content in the body has relatively close relationship, and the more large particle content, the better bank slope stability.Therefore, from the biological diversity, slope soil erosion resistance and the mechanical stability bank slope of point of view, it is very necessary to popularize vegetation bank protection measures, natural material fabric cushion revetment measures in Chang shou District, Chongqing Tao hua xi.