燃煤发电一直是我国能源供给的主体,粉煤灰是煤炭燃烧过程中最常见的一种废渣,不仅占用土地资源,还易引起扬尘污染环境。在当前大力倡导绿色发展新时代的背景下,废渣资源化利用与土体改良发展模式相结合,不仅能应对粉煤灰资源过剩及缓解污染问题,还能为土体改良提供掺加剂的来源。文章基于膨胀土改良,详述粉煤灰分类与现状,综合分析粉煤灰的掺入方式对膨胀土体积变形、承载力和裂隙性改善等的影响,并对改良效果与改良机理进行全面地总结,为工程建设中采用粉煤灰改良膨胀土提供参考。Coal-fired power generation has always been the main body of energy supply in China, fly ash is the most common waste slag in the process of coal combustion, which not only occupies land resources, but also easily causes dust to pollute the environment. Under the background of vigorously advocating the new era of green development, the combination of waste slag resource utilization and soil improvement development model can not only deal with the surplus of fly ash resources and alleviate pollution problems, but also provide a source of additives for soil improvement. Based on the improvement of expansive soil, this paper details the classification and current situation of fly ash, comprehensively analyzes the effects of the incorporation method of fly ash on the improvement of expansive soil volume deformation, bearing capacity, and fissure, and comprehensively summarizes the improvement effect and improvement mechanism, so as to provide references for the improvement of expansive soil by fly ash in engineering construction.
