建国南路橡胶改性沥青混凝土面层结构优化设计
发布时间：2018-08-04 18:14
【摘要】：本文以鞍山市建国南路实际工程为依托，对设计院给出的路面结构设计进行进一步优化研究。首先，，对路面上面层橡胶改性沥青混凝土配合比设计进行优化，主要针对密级配及间断级配两种级配类型，通过马歇尔试验结果得到了密级配最优配合比以及间断级配最优配合比；通过浸水马歇尔试验检验两种级配类型的水稳定性及抗水损害的剥落能力。在结构层次优化方面，将下面层材料由普通沥青混凝土改为橡胶改性沥青混凝土，在满足其力学指标以及最小结构层厚度的基础上，采用HPDS2003A路面设计计算软件对路面结构层进行优化计算；并通过ANSYS有限元数值模拟软件进行拟合；最后，以路表弯沉值及层底拉应力为指标，结合筑路材料的价格，利用功效系数法对设计方案进行综合优选。 试验及计算的结果表明，两种级配类型的残留马歇尔稳定度均满足要求，而间断级配橡胶改性沥青混合料的马歇尔残留度要高于密级配橡胶改性沥青混合料，故选取间断级配的配合比方案为最终的目标配合比优化方案。利用路面设计软件和有限元数值模拟软件两种方法计算得出的层底拉应力、路表弯沉值，两者总体变化的趋势相同。最后通过功效系数法综合确定：3cm橡胶改性沥青混凝土+5cm橡胶改性沥青混凝土+20cm水泥稳定砂砾(4.5%)+20cm水泥稳定砂砾(5%)+30cm填隙碎石的路面结构组合形式为最终的优化设计方案。
[Abstract]:Based on the actual project of Jianguo South Road in Anshan City, this paper further optimizes the design of pavement structure given by the Design Institute. First of all, the mix design of rubber modified asphalt concrete on the surface of pavement is optimized, mainly aiming at two kinds of gradation types: dense gradation and discontinuous gradation. Through Marshall test results, the optimal mix ratio of dense gradation and discontinuous gradation is obtained, and the water stability of two gradation types and the peeling ability of water damage resistance are tested by immersion Marshall test. In the aspect of structural level optimization, the material of lower layer is changed from ordinary asphalt concrete to rubber modified asphalt concrete, and the mechanical index and the minimum thickness of structure layer are satisfied. The HPDS2003A pavement design calculation software is used to optimize the pavement structure layer, and the ANSYS finite element numerical simulation software is used to fit it. Finally, taking the deflection value of the pavement surface and the tensile stress at the bottom of the pavement as the index, combined with the price of the road building materials, The efficiency coefficient method is used to optimize the design scheme. The results of test and calculation show that the residual Marshall stability of the two gradation types meets the requirements, while the Marshall residual degree of the intermittent graded rubber modified asphalt mixture is higher than that of the dense graded rubber modified asphalt mixture. Therefore, the scheme of discontinuous gradation is chosen as the final optimization scheme. By using the software of pavement design and the numerical simulation software of finite element, the general changing trend of the tensile stress and the deflection value of the pavement surface are the same. Finally, through the efficiency coefficient method, the pavement structure combination form of 5cm rubber modified asphalt concrete 20cm cement stabilized gravel (4.5%) 20cm cement stabilized gravel (5%) 30cm filled gravel is determined as the final optimum design scheme.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.2
[Abstract]:Based on the actual project of Jianguo South Road in Anshan City, this paper further optimizes the design of pavement structure given by the Design Institute. First of all, the mix design of rubber modified asphalt concrete on the surface of pavement is optimized, mainly aiming at two kinds of gradation types: dense gradation and discontinuous gradation. Through Marshall test results, the optimal mix ratio of dense gradation and discontinuous gradation is obtained, and the water stability of two gradation types and the peeling ability of water damage resistance are tested by immersion Marshall test. In the aspect of structural level optimization, the material of lower layer is changed from ordinary asphalt concrete to rubber modified asphalt concrete, and the mechanical index and the minimum thickness of structure layer are satisfied. The HPDS2003A pavement design calculation software is used to optimize the pavement structure layer, and the ANSYS finite element numerical simulation software is used to fit it. Finally, taking the deflection value of the pavement surface and the tensile stress at the bottom of the pavement as the index, combined with the price of the road building materials, The efficiency coefficient method is used to optimize the design scheme. The results of test and calculation show that the residual Marshall stability of the two gradation types meets the requirements, while the Marshall residual degree of the intermittent graded rubber modified asphalt mixture is higher than that of the dense graded rubber modified asphalt mixture. Therefore, the scheme of discontinuous gradation is chosen as the final optimization scheme. By using the software of pavement design and the numerical simulation software of finite element, the general changing trend of the tensile stress and the deflection value of the pavement surface are the same. Finally, through the efficiency coefficient method, the pavement structure combination form of 5cm rubber modified asphalt concrete 20cm cement stabilized gravel (4.5%) 20cm cement stabilized gravel (5%) 30cm filled gravel is determined as the final optimum design scheme.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.2
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相关期刊论文 前10条
1 谭忆秋;徐立廷;辛星;周纯秀;;马歇尔法下橡胶改性沥青混凝土成型工艺研究[J];公路;2006年02期
2 杨春峰;王晓初;李赢;王奕鹏;;橡胶粉改性沥青混合料的应用实践[J];公路;2010年10期
3 张德;王i
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