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为了提高级配碎石力学性能,采用逐级填充方法以空隙率最小为原则优化得到粗集料级配,通过变化粗细集料比例、细集料级配以研究级配碎石物理力学特性,初步提出具有优良物理力学特性的级配。在此基础上,进一步深入研究筛孔通过率对级配碎石力学性能的影响规律,以力学性能最优为原则,提出强嵌挤骨架密实级配,并通过颗粒流模拟技术予以验证。结果表明,与已有文献中骨架密实级配碎石相比,本文提出的骨架密实型级配力学性能最优,CBR达500%～550%,围压100、300、500 kPa和700 kPa时的剪切强度分别为0.28、0.78、1.78 MPa和2.45 MPa,实现了强嵌挤的目的。
In order to improve the mechanical properties of graded macadam, the graded gradation was optimized by adopting the gradual filling method to optimize the coarse aggregate gradation. By varying the proportion of coarse aggregate, fine aggregate gradation to study the physical and mechanical properties of graded macadam, Initially proposed with excellent physical and mechanical properties of grading. On this basis, further study on the influence of mesh passing rate on the mechanical properties of graded macadam was carried out. Based on the principle of optimal mechanical properties, a dense gradation of strong inlay skeleton was proposed and verified by particle flow simulation. The results show that compared with the existing skeleton compact graded macadam, the proposed framework has the best mechanical properties with a CBR of 500% ~ 550% and confining pressures of 100, 300, 500 kPa and 700 kPa Shear strength of 0.28,0.78,1.78 MPa and 2.45 MPa, respectively, to achieve the purpose of strong intrusion.