为了提升无砂混凝土基层材料的抗冲刷特性并揭示不同冲刷条件下强度、模量的衰减规律，以7天无侧限抗压强度、渗透系数和抗压回弹模量为评价指标，采用响应面法确定了无砂混凝土的最优配合比.开展了无砂混凝土冲刷试验，分析了冲刷时间、冲刷频率和冲击力对抗冲刷性能的影响，揭示了无砂混凝土经过不同冲刷条件后强度和模量的衰减规律. 结果表明：无砂混凝土最优配合比为级配 Ⅰ、水灰比0.35和目标孔隙率18%.相较于水泥稳定碎石而言，无砂混凝土具有更好的力学特性和抗冲刷性能.

To improve the scour resistance of no-fines concrete base material and reveal the attenuation of strength and modulus under different scouring conditions, the response surface method was used to determine the optimal mix of no-fines concrete using 7-day unconfined compressive strength, permeability coefficient, and compressive rebound modulus as the evaluation indexes. The scouring test of no-fines concrete was carried out to analyze the effects of scouring time, scouring frequency, and impact force on the scouring resistance and to reveal the attenuation law of strength and modulus of no-fines concrete after different scouring conditions. The results show that the optimal mix ratio of no-fines concrete is gradation Ⅰ, water-cement ratio 0.35, and target porosity 18%. Compared with cement-stabilized gravel, no-fines concrete has better mechanical properties and scour resistance.

U414

国家自然科学基金项目（面上项目，重点项目，重大项目）