A capillary blocking coating for slope protection and its preparation method and application

Abstract

The invention provides a capillary retardation covering layer for slope protection and its preparation method and application. The capillary retardation covering layer includes a water storage green layer and a drainage layer sequentially arranged from outside to inside, and the water storage green layer consists of The composition of improved dregs includes engineering dregs and biochar with a mass fraction of 5%-15%. The particle size of engineering dregs does not exceed 10mm, and the particle size of biochar does not exceed 1mm. Water storage greening layer The compaction degree is not less than 95%, and vegetation can be planted; the drainage layer is mainly composed of recycled coarse aggregate with a particle size of 20mm-50mm, and the relative compaction density is not less than 90%. The covering layer is laid on the slope body to reduce the infiltration of rainwater into the slope body, maintain a low moisture content of the slope body, that is, maintain a high soil suction, and thus maintain the stability of the slope.

Description

technical field [0001] The invention relates to the technical field of slope protection, in particular to a capillary retardation covering layer for slope protection and its preparation method and application. Background technique [0002] In recent years, with global warming, the frequency of rainstorms and the risk of floods have increased, landslide disasters have increased year by year, and have seriously threatened the safety of people's lives and property. The main cause of landslides is often the infiltration of rainwater, which will lead to an increase in the moisture content of the slope soil or an increase in the groundwater level, and the decrease in the shear strength of the soil will cause the slope to become unstable. In order to prevent rainwater infiltration, stone or concrete retaining walls and shotcrete armor are often used. Although this method can effectively prevent the infiltration of rainwater, it also brings serious economic and environmental proble...

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Problems solved by technology

[0005] (2) Consume a lot of soil resources

The covering layer requires the use of a large amount of natural soil or artificial soil materials, which will cause difficulties in obtaining soil and exacerbate the shortage of soil resources; in addition, a large amount of soil resources need to be transported and allocated from outside, which increases the construction cost of the covering layer

[0006] (3) High economic cost

According to the above situation, the use of a large amount of soil materials to construct the covering layer will inevitably require a large amount of soil materials to be transported outside, and long-distance transportation from other places will inevitably increase the project cost

[0007] (4) The covering material is not green and environmentally friendly, and the construction waste in the landfill cannot be fully utilized

[0009] (1) The compaction degree of vegetation soil is low, which affects the slope stability

In order to ensure soil permeability and plant growth, the compaction of slope vegetation soil is generally low (60-80%); however, the existence of such a low compaction vegetation soil layer will lead to a large amount of rainwater infiltration and Finally, it enters the slope body, thus affecting the stability of the slope

[0010] (2) Insufficient soil nutrition requires artificial fertilization

However, generally speaking, this kind of slope soil lacks nutrients, and it is difficult to ensure the growth of slope plants. Artificial fertilizers are needed to provide nutrients, and even provide soil amendments to improve the soil aggregate structure.

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