Abstract
To solve the environmental protection issue of carbonaceous rock slope, the failure mechanism of carbonaceous rock slope and the protection mechanism of vegetation concrete are analyzed based on the engineering characteristics of carbonaceous rock and vegetation concrete. Therefore, the field test of vegetation concrete was carried out to obtain the optimal dosage of vegetation concrete greening additive. The application of environmental protection technology of vegetation concrete on carbonaceous rock slope is applied in slope engineering of Hebai highway, and the change law of soil fertility was analyzed to verify the effect of ecological protection. The results show that the protection mechanism of vegetation concrete slope protection technology is mainly categorized into two groups, namely, the surface sealing effect of vegetation concrete substrate in the early stage and the plant ecological protection effect in the later stage. The experiment results show that the optimum dosage of green additive for vegetation concrete is ranging from 30 kg/m3 to 40 kg/m3. According to the field application, within one year after the construction of vegetation concrete, the contents of available phosphorus, potassium, and organic matter increased by 70.2%, 24.9%, and 76.8%, respectively. Moreover, the content of alkali hydrolyzed nitrogen decreased by 44.8% and bulk density by 17.4%; the content of total phosphorus changed little. After 60 days of construction, the vegetation coverage rate of the slope can reach more than 95% and there is no obvious soil erosion phenomenon after three times of heavy rainfall.
Highlights
With the booming demand for infrastructure construction such as highways and railways, a series of environmental issues have become increasingly prominent
Different from the general soil slopes, carbonaceous rock slopes will be destroyed by the living environment around the vegetation and cause soil erosion, which has induced a series of engineering geological disasters, such as landslides and debris flows. us, slope ecological protection has attracted attention and has become a hot research issue in recent years [1]
Conventional vegetation is generally difficult to survive, acid-resistant vegetation can live better. erefore, in protecting this kind of slope, other than considering the effect of slope protection, acid-resistant plants should be selected as vegetation restoration items for the ecological protection of carbonaceous rock slopes
Summary
With the booming demand for infrastructure construction such as highways and railways, a series of environmental issues have become increasingly prominent. Erefore, the surface of carbonaceous rock slope should be closed in time after excavation to prevent it from being exposed to the atmosphere for a long time, avoiding the infiltration of surface water into the slope and resulting in the disintegration and softening of carbonaceous rock, which decreases soil strength and slope stability inducing landslide and geological disasters as a consequence. Is technique has the advantages of rapid planting of common soil and possesses the characteristics of surface sealing and strong erosion resistance of hanging net shotcrete, which is very suitable for ecological protection engineering of carbonaceous rock slope. The slope can be evergreen all over the year; herbaceous and shrub seeds are used according to a certain proportion, mainly including acid-resistant Sophora flavescens and bermudagrass E protection mechanism of spraying vegetation concrete ecological slope mainly includes two stages: (1) the loss. e reinforcement effect of plant roots is a key factor to maintain the stability of the slope surface through avoiding soils erosion by rainfall splash achieving a long-term slope stability condition and environmental sustainability
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