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基于离散元理论的OGFC矿料级配设计

Keywords: 开级配沥青磨耗层混合料,离散元,粗集料,级配设计

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Abstract:

提出开级配沥青磨耗层(opengradedfrictioncourses,OGFC)混合料矿料级配设计应针对粗细集料在混合料中所起的作用不同进行分别设计的理念.提出基于离散元理论和试验相结合的OGFC混合料粗集料级配设计的新方法:以4.75mm筛孔通过率作为粗集料级配控制点,根据离散元理论计算粗集料中各粒径最优体积分数,通过粗集料的干捣试验进行VCAmin的验证,根据粗集料空隙率和设计空隙率的要求,确定粗集料的级配.采用N法进行OGFC混合料的细集料级配设计,为了满足设计空隙率的要求,在细集料设计中要求2.36~4.75mm的质量分数不超过5%.在研究粗集料和细集料级配设计的基础之上给出了OGFC矿料新的级配范围.

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