Abstract
The novel class F fly ash-based geopolymer, largely made of fly ash from the coal solid waste, was used as a kind of grouting material in the coal and electricity-integrated mine from which the solid waste comes, for the purpose of in situ utilization of fly ash. The ratio experiment of material, designed through the orthogonal method, was used to study material properties such as fluidity and strength which are important to the application of mine grouting, and the optimal material proportioning scheme for Green Fly Ash-based grouting material is determined. It has been found out that there was serious rib spalling, roof deformation, obvious floor heave, crack development, and some water seepage in the permanent refuge chamber of the mine. Therefore, to solve these problems, a specific scheme of grouting reinforcement for the surrounding rocks of the permanent refuge chamber and roadway in this mine was designed. Through an analysis of the reinforcement effect of the cementation of surrounding rock after the grouting process, it can be concluded that the green fly ash-based polymer as grouting material can well penetrate into the cracks of the broken surrounding rock and get fully cemented with the surrounding rock and that it can reduce the deformation of the surrounding rock effectively, increase the integrity, and improve the carrying capacity of the surrounding rock. Besides, the grouting reinforcement effect of surrounding rock was verified through numerical simulation, and the grouting process design of green fly ash-based polymer mine was discussed. This study can provide a green and economical approach to the in situ utilization of fly ash which is a kind of coal solid waste.
Highlights
With the increasing depletion of coal resources in Eastern China, the hub of coal industry has been gradually transferred to Northwestern China with abundant coal resources, resulting in an urgent need for adjustment of the traditional mode of coal mining and utilizing [1, 2]
Eastern China is still the main place where coal-consuming industry pervades, which requires and promotes the large-scale application of industrial mode of coal-electricity integration largely, and this mode means that the coal will be transformed into electricity in Northwestern China instead of being transferred to Eastern China, and the electricity will be transferred to Eastern China to provide electricity supply for the industrial purpose there [3, 4]
Northwestern China is abundant in natural resources, yet its ecological environment is very fragile. ere is a large amount of industrial waste resulting from coal mining and coal-fired power generation, which will cause irreparable damage to the ecological environment [5, 6]
Summary
With the increasing depletion of coal resources in Eastern China, the hub of coal industry has been gradually transferred to Northwestern China with abundant coal resources, resulting in an urgent need for adjustment of the traditional mode of coal mining and utilizing [1, 2]. Ere is a large amount of industrial waste resulting from coal mining and coal-fired power generation, which will cause irreparable damage to the ecological environment [5, 6]. Coal-electricity integration industry will produce a large amount of solid waste such as fly ash and coal gangue. For coal gangue, it can stay inside the well in China so as not to cause harm to the environment. The fly ash has become a common raw material for construction [8,9,10,11], most of the fly ash can only be carelessly disposed due to the remoteness of the places where the transformation of coal into electricity happens in Northwestern China and a lack of enough market for the Advances in Civil Engineering consumption of the fly ash as a construction material, resulting in huge harm to the ecological environment
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