| With people's increasing attention to the ecological environment,ecological civilization construction,“Sponge City” construction and “The Action Plan for Prevention and Treatment of Water Pollution”have been launched successively.In the past,extensive slope protection and urban construction can not meet the requirements of ecological green sustainable development.Therefore,frost-resistant vegetation concrete,which has the dual functions of engineering protection and ecological green,becomes a new type of ecological slope protection material equipped with broad application prospect in slope protection and “Sponge City” construction.This paper discusses and studies several aspects including the alkalireducing material and concentration optimization of it,plant-growing base material,plantgrowing performance and application of river ecological slope protection engineering.In regard to the problem of high alkalinity of the pores,the paper put forward a set of alkali-reducing methods.It is found that the pH value change of pore fluid is a dynamic process without alkali reduction measures.This paper optimized the alkali-reducing material and alkali-reducing concentration on the basis of previous research,and the suitable alkalireducing material and compound alkali-reducing concentration range were obtained.Through the study of the water and soil solution,the differences between them were found.According to the characteristics of soil,a chemical-biological compound alkali reduction method was put forward,which can reduce the alkali of concrete soil effectively and quickly,and maintain an appropriate environment of soil and water for vegetation growth for a long time.Aimed at the plant base material of frost-resistant vegetation concrete,a plant base material is compound applied to frost-resistant vegetation concrete,which can realize the purposes of salt suppression,alkali reduction,water and fertilizer conservation and erosion resistance.The structure of the plant base material is divided into two layers: a surface soil layer plant base material and a transition layer plant base material;The main components of the fertilizer are as follows: ripe loam,humus,water-retaining agent,fly ash,calcium super phosphate,plant fiber,slow-release organic fertilizer,soil modifier and the like,and the fertilizer is prepared into plant-growing base materials according to different mass ratios,and is used for filling pores of it and covering the surface soil layer with grass.At the same time,the method of filling the planting substrate layer by layer under the action of gravity is usedfor filling the pores,so that the filling is sufficient,and the requirement of vegetation growth can be met.Based on the plant compatibility characteristics of frost-resistant vegetation concrete planting technology,vegetation growth and development law,plant growth test was carried out,and the study showed that among the six herbs tested in frost-resistant vegetation concrete,Elymus dahuricus Turcz germinated at latest,and the emergence rate was the lowest,and the growth and development was highly dispersed with bad compatibility with vegetation concrete plants.The other five herbs all follow the normal logical growth curve of“s” type,and have good compatibility with frost-resistant vegetation concrete.The coverage of Cynodondactylon(Linn.)Pers.,Festuca elata Keng ex E.Alexeev,Agrostis stolonifera can reach more than 80% of the requirements of slope protection,the density is more than 1.60,the color is thick and green,the slope protection effect is good,and the compatibility degree with vegetation concrete is high;Vegetation roots are distributed in three layers in frostresistant vegetation concrete,which is dumbbell-shaped;According to the comprehensive evaluation of the appearance quality of six grasses on frost-resistant vegetation concrete,the quality of Cynodondactylon(Linn.)Pers.> Festuca elata Keng ex E.Alexeev> Agrostis stolonifera > Zoysia tenuifolia> Vetiveria zizanioides L.> Elymus dahuricus Turcz can be taken into consideration in the selection of slope protection grass in the engineering application,the Cynodondactylon(Linn.)Pers.,Festuca elata Keng ex E.Alexeev,Agrostis stolonifera,Zoysia tenuifolia can be combined with high and low slope protection,and the combination of the former and the latter can be taken into consideration.Aimed at the engineering application of frost-resistant vegetation concrete in the northern region,through the application of frost-resistant vegetation concrete in the slope protection project of Yingwen river,this paper explores and illuminates the technical process and key points of the design,production and construction of frost-resistant vegetation concrete block,and forms a set of construction technology suitable for the construction of frost-resistant vegetation concrete.After grass was planted in frost-resistant vegetation concrete,the slope surface is fully covered for 60 days,and the grass grows luxuriantly achieving good slope protection effect,which bring good benefit of ecology,society and economy and provide practical experience for the engineering application. |
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