【摘要】：本文以鞍山市建國南路實際工程為依托，對設計院給出的路面結構設計進行進一步優(yōu)化研究。首先，，對路面上面層橡膠改性瀝青混凝土配合比設計進行優(yōu)化，主要針對密級配及間斷級配兩種級配類型，通過馬歇爾試驗結果得到了密級配最優(yōu)配合比以及間斷級配最優(yōu)配合比；通過浸水馬歇爾試驗檢驗兩種級配類型的水穩(wěn)定性及抗水損害的剝落能力。在結構層次優(yōu)化方面，將下面層材料由普通瀝青混凝土改為橡膠改性瀝青混凝土，在滿足其力學指標以及最小結構層厚度的基礎上，采用HPDS2003A路面設計計算軟件對路面結構層進行優(yōu)化計算；并通過ANSYS有限元數(shù)值模擬軟件進行擬合；最后，以路表彎沉值及層底拉應力為指標，結合筑路材料的價格，利用功效系數(shù)法對設計方案進行綜合優(yōu)選。 試驗及計算的結果表明，兩種級配類型的殘留馬歇爾穩(wěn)定度均滿足要求，而間斷級配橡膠改性瀝青混合料的馬歇爾殘留度要高于密級配橡膠改性瀝青混合料，故選取間斷級配的配合比方案為最終的目標配合比優(yōu)化方案。利用路面設計軟件和有限元數(shù)值模擬軟件兩種方法計算得出的層底拉應力、路表彎沉值，兩者總體變化的趨勢相同。最后通過功效系數(shù)法綜合確定：3cm橡膠改性瀝青混凝土+5cm橡膠改性瀝青混凝土+20cm水泥穩(wěn)定砂礫(4.5%)+20cm水泥穩(wěn)定砂礫(5%)+30cm填隙碎石的路面結構組合形式為最終的優(yōu)化設計方案。
[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.
【學位授予單位】：遼寧科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414;U416.2

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本文編號：2164699