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陡坡路段沥青路面由于沥青路面抗剪强度不足易发生推移破坏。笔者通过有限元程序分析了两种温度不同竖向荷载、水平荷载作用下的路面剪应力分布规律,提出了沥青混合料抗剪强度设计标准值。采用单轴贯入试验对不同级配类型,沥青类型、集料类型、沥青用量及外掺剂的沥青混合料进行抗剪强度试验,试验结果与抗剪强度设计标准值对比分析表明:一般沥青混合料均可满足抗剪强度设计水平Ⅰ的要求;除卵石外,棱角性良好的集料可满足水平Ⅱ的要求,对于水平Ⅲ,在最大公称粒径为16类型的沥青混合料中只有SMA-16可以满足,而对于AC-20除了沥青用量较大的混合料不满足外其他均可满足;为适应水平Ⅳ的要求,可在混合料中添加纤维或抗车辙剂;一般混合料已经不能满足水平Ⅴ的要求。
Asphalt pavement steep slope road due to lack of shear strength prone to passing damage. Through the finite element program, the author analyzes the distribution law of pavement shear stress under different vertical loads and horizontal loads under two different temperatures and puts forward the design standard value of shear strength of asphalt mixture. The uniaxial penetration test was used to test the shear strength of asphalt mixture with different gradation types, asphalt types, aggregate types, asphalt content and external admixture. The comparison between the test results and the standard values of shear strength design shows that the common asphalt Mixture can meet the requirements of the design level of shear strength Ⅰ; Pebbles, the corners of the good aggregates to meet the requirements of Level Ⅱ, the level Ⅲ, the maximum nominal size of 16 types of asphalt mixture only SMA -16 can meet, but for the AC-20 in addition to the asphalt content of the mixture is not satisfied with the other can be met; in order to meet the requirements of level IV, the mixture can be added to the fiber or rutting agent; general mixture can no longer Meet the level Ⅴ requirements.