Abstract
In order to realize the resource utilization of fly ash, a kind of ecological slope protection substrate was prepared by mixing fly ash produced by MSW incineration into slope protection soil. Through the direct shear test and a leaching experiment on ion pollutants, the influence that shear strength of the substrate changed with root content, ash content, and moisture content and the ecological effects of leach liquor were investigated. The results showed the following: (1) When the optimum moisture content is about 24.9%, the shear strength of the substrate is the maximum. (2) Fly ash can improve the shear strength of the soil, which can reach 1.67 times as much as that of plain soil, and the optimum content of fly ash is 5%–6.7%. (3) The root system can increase the cohesion and internal friction angle of the substrate soil but mainly increases the cohesion of the substrate soil. (4) Plants grow taller in ash-mixed soil than in plain soil. (5) When the fly ash content is 20%, the ion concentrations of Cl, Cu, and Zn are the highest: 220.7, 0.153, and 1.526 mg/L, respectively. All of them are lower than the standard limit of class V water and gradually decrease with time. Therefore, the leaching liquid will not cause environmental pollution and meet the ecological requirements.
Highlights
In the process of urbanization, the amount of domestic garbage, which is a product of urban metabolism, continues to rise
Many researchers have found that the addition of fly ash to soil is beneficial to plant growth, and soil improvements fly ash that is full of phosphorus, potassium, and calcium will trigger a series of biological reactions when mixed with soil
Compared with plain soil (0% ash content), there was a certain degree of improvement
Summary
In the process of urbanization, the amount of domestic garbage, which is a product of urban metabolism, continues to rise. Scholars at home and abroad have made some study on converting fly ash from garbage incineration into useful materials for engineering. E inclusion of waste incineration fly ash in slope protection soil can convert it into a beneficial material; the incorporation of fly ash changes the strength properties of the soil. Is paper proposes the use of fly ash produced from waste incineration to prepare ecological slope protection substrate, which enhances soil strength and promotes plant growth and saves land resources and protects the environment. It is an innovative idea to study its feasibility as the substrates of ecological slope protection and to realize the resource utilization of waste fly ash. (2) e effect of ash content on the plant growth performance of the substrate and the effect of different root contents on the shear strength of the substrate. A series of tests were performed to investigate the following questions. (1) e influence of fly ash content on the shear strength of substrates with different moisture contents. (2) e effect of ash content on the plant growth performance of the substrate and the effect of different root contents on the shear strength of the substrate. (3) e influence of the amount of fly ash on the concentration of contaminated ions and the surrounding ecological environment
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