为探索黄河下游沉积泥沙在路基工程中的应用，以石灰和粉煤灰对其进行改良，结合回弹模量试验、直接剪切试验和极限承载能力计算，对改良黄河泥沙的路用性能进行分析.试验和计算结果表明：当粉煤灰掺和比大于40%时，改良黄河泥沙的回弹模量符合规范控制要求，但对抗剪强度指标的影响降低；当石灰掺和比大于4%时对回弹模量提升效果明显，对抗剪强度指标的影响降低；结合极限承载力计算，综合考虑时效性和经济性，可将4%石灰掺和比+40%粉煤灰掺和比+7d养护时间作为黄河下游沉积泥沙最佳改良方案.

To explore the application of sediment from the lower Yellow River in subgrade engineering, the sediment was improved using lime and fly ash. Through a combination of resilient modulus tests, direct shear tests, and ultimate bearing capacity calculations, the road performance of the modified Yellow River sediment was analyzed. The experimental and computational results indicate that when the fly ash content exceeds 40%, the resilient modulus of the modified sediment meets the requirements of relevant standards, though there is a reduction in shear strength. When the lime content exceeds 4%, there is a significant improvement in the resilient modulus, but the effect on shear strength diminishes. Based on the ultimate bearing capacity calculations, considering both timeliness and economic efficiency, the optimal modification scheme for the sediment from the lower Yellow River is determined to be a mixture of 4% lime, 40% fly ash, and a curing time of 7 days.

U414

山东省自然科学(ZR2022ME042)；山东省高等学校青创科技支持计划(TJY2303)；济南大学博士(XBS2469)；山东省住房城乡建设科技计划项目(2024KYKF-XCJ017)