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Using fly ash as a roadbed filler represents a significant and innovative advancement in civil engineering. This approach not only offers a sustainable solution for utilizing industrial solid waste but also helps alleviate the environmental pressures associated with waste disposal. By replacing traditional road construction materials with fly ash, engineers can reduce costs while simultaneously contributing to eco-friendly infrastructure development. However, the effective implementation of fly ash in roadbed construction presents challenges, with compaction control emerging as a critical issue. Poor compaction can lead to a range of problems, including uneven settlement, reduced bearing capacity, and compromised roadbed integrity. These issues can significantly impact the long-term performance and durability of the pavement, potentially resulting in costly repairs and safety hazards. To address these challenges, this study conducts a series of comprehensive electric compaction experiments and vibration compaction tests. By meticulously adjusting key parameters such as water content, compaction effort, vibration duration, and vibration frequency, the research aims to identify the optimal conditions for achieving maximum dry density and uniform compaction. The experimental results, rigorously validated through mathematical modeling, reveal several key insights. The relationship between dry density and water content follows a unimodal trend, with peak dry density occurring at an optimal water content of 44%-45%. Moreover, dry density increases with the number of compaction blows, reaching a satisfactory range of 1.05-1.14 g/cm3 after 98 blows. Interestingly, while dry density consistently increases with vibration frequency, it exhibits a peak at 30 seconds of vibration duration; beyond this point, excessive vibration may induce liquefaction, leading to a reduction in density. Based on these findings, a comprehensive compaction model covering the transition from drying to liquefaction is established. This model facilitates accurate predictions of dry density under various conditions, providing valuable references for optimizing construction parameters and enhancing compaction control. By implementing these optimized parameters, engineers can ensure more uniform and stable roadbeds, thereby promoting the wider application of fly ash in road construction. This, in turn, contributes to environmental sustainability and the development of resilient infrastructure, paving the way for a greener and more sustainable future.
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Basic Information:
DOI：10.13637/j.issn.1009-6094.2025.1401
China Classification Code:U416.1
Citation Information:
[1]Hui Yingxin,Zheng Liyang,Guo Jukun ,et al.Dynamic compaction characteristics and model construction of fly ash subgrade filling in road engineering[J].Journal of Safety and Environment,2026,26(08):3245-3255.DOI:10.13637/j.issn.1009-6094.2025.1401.
Fund Information:
宁夏自然科学基金项目(2025AAC030528); 宁夏回族自治区重点研发计划重点项目(2022BFE02006)
2026-08-19
2026-08-19