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    两种框格梁生态护坡技术及其应用效果———以安徽岳武高速公路为例

    Two technologies of concrete frame ecological slope protection and application effect: Taking the Anhui Yuewu highway as an example

    • 摘要: 为了选择更适合在山区高速公路推广应用的生态护坡模式,选取安徽岳武高速公路边坡为试验区,以框格梁复合植被毯生态护坡技术及框格梁植生袋护坡技术作为试验坡面的植被恢复措施,调查并对比分析植物生长情况、土壤理化性质和水土保持效果。结果表明:施工半年后,采用框格梁复合植被毯生态护坡技术试验小区的灌木成活率、株高、基茎、冠幅、盖度均优于框格梁植生袋试验小区,且土壤孔隙度增加了2.78%,全氮增加了0.31 mg/kg,有效磷增加了3.59 mg/ kg,速效钾增加了4.79 mg/kg,有机质增加了3.06 g/kg,土壤侵蚀厚度减少了1.7 mm,土壤侵蚀量减少了2379.2 t/ km2 。对比2种生态护坡模式的经济成本,发现框格梁复合植被毯技术的施工效率更高,植被建植成本更低,养护费用及养护年限更少。

       

      Abstract: To investigate the more appropriate ecological slope protection technology for the highway slope in mountain area, we systematically introduced the characteristics and construction process of the two compound frame technology systems at the Yuewu Highway slope experimental area in Anhui Province. Two technologies, i. e., the concrete frame compound vegetation carpet and concrete frame compoundvegetative bag were selected for ecological slope protection. The two methods were used as vegetation restoration measures for investigating and comparing the plant growth, soil properties and soil conservation effect. Results showed that six months after the construction, the complex indexes including shrub survival rate, height, base stems, canopy breadth and coverage were better in the area using the concrete frame compound vegetation carpet technology than the area using concrete frame compound vegetative bag technology. The concrete frame compound vegetation carpet technology had a more significant effect in soil improvement and control of soil erosion than the concrete frame compound vegetative bag technology.The soil porosity increased by 3.78%; soil total N, P and K increased by 0.51 mg/kg, 5.59 mg/ kg and 8.79 mg/ kg, respectively; the organic matter increased by 9.06 mg/ kg, the thickness of soil erosion and the amount of soil erosion decreased by 1.7 mm and 2 379.2 t/ km2, respectively. Comparing the economic costs of the two technologies in our project, the technology of concrete frame compound vegetation carpet had higher efficiency in construction, lower vegetation planting and maintenance cost, and shorter maintenance period. Through comparing the application effect of two technologies, it is not hard to conclude that the concrete frame compound vegetation carpet technology is more suitable to be promoted and applied in the mountain highway slope restoration, and it provides guide in the ecological slope protection for the highway slopes in the future.

       

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