Study On Biological Enzyme Fiber Composite Modified Ecological Solidification Revetment Technology

Whether the soil can be stable is the key point of slope protection.At present,the most common modes of slope protection are plastering surface,shotcreting,shotcreting,masonry stone wall,anchor shotcreting,anchor shotcreting,etc.These measures will lead to serious damage to the ecological environment and increase the cost of maintenance and repair at later stage.Ecological slope protection uses the vertical roots of plants as the original pre-stressed anchor,the roots of plants through the shallow loose soil,thus anchoring to the deep stable soil,and ultimately achieve the role of slope protection.Because of the water pressure generated by rainfall in the soil,displacement of the soil on the slope surface will occur.Plants can reduce the pore water pressure and improve the shear resistance of soil through transpiration and water absorption,so the slope can be stable.The vegetation cover on the slope can effectively prevent the soil from being eroded by the current,and also can effectively prevent the wind and sand from invading the soil.Because it takes a long time for trees to grow,it is necessary to reinforce the soil in the early stage of ecological slope protection.China's transportation industry is developing rapidly,and highway construction is more green and environmental protection.Bio-enzymes and fibers,as a high-quality and efficient soil ecological solidification materials,will inevitably be widely used in future traffic construction.Polypropylene(PP)fiber is obtained by high-speed unidirectional tensile PP material,adding to the soil can obtain a three-dimensional fiber staggered structure,which can effectively prevent shrinkage cracks;improve soil deformation characteristics and toughness;affect soil strength properties;improve durability.In engineering practice,adding bio-enzymes can greatly improve the grip force of soil on fiber,so as to give full play to the strength of fiber itself.This paper mainly studies the effect of polypropylene fiber and bio-enzymes on soil properties.The main research contents are as follows:(1)A modified fiber has been developed independently.Light calcium carbonate was prepared by precipitation method.PP fiber was grafted with maleic anhydride as modifier.Maleic anhydride modified PP fiber was coated with light calcium carbonate and sodium acrylate as main raw materials.The modified fiber with good dispersibility was obtained and the adhesion between fiber and matrix was greatly improved.(2)The composite soil modified by polypropylene fiber and bio enzyme was studied.The effect of PP fiber and bio-enzyme content on soil properties was studied by modifying soil with PP fiber and bio-enzyme.It was found that when the optimum content of bio-enzyme in soil was 40g/m_and the fiber content was 2% of the soil quality,the strength of the sample was higher,and the effect of composite modification soil was the best.(3)Application of biological enzyme and fiber composite revetment.Through simulated rainwater erosion experiment,the anti-erosion and destructive performance of soil improved by enzyme-fiber composite modification were studied,and the influencing factors were discussed.It was applied to the ecological slope protection by spraying sowing in the guest soil to improve the long-term effect of ecological protection and the anti-erosion performance of slope protection.The stability of slope protection at early stage was significantly improved.