论文部分内容阅读
以弹性层状体系理论为基础,采用ANSYS程序建立了经过可靠性验证的旧水泥混凝土路面沥青混凝土加铺层结构三维有限元模型,分析了车辆荷载、加铺层厚度、材料参数变化及各种典型防止反射裂缝措施对沥青混凝土加铺层底最不利处荷载应力的影响。分析结果表明:增加沥青混凝土加铺层厚度能有效降低加铺层结构层底最大主应力σ1、最大剪应力τmax和等效应力σe;对分析的实例加铺层结构,在铺筑级配沥青碎石过渡层的情况下,土工布夹层模量变化对缓解荷载应力的作用并不明显;在加铺层结构拟采用的各种典型防止反射裂缝措施中,以7cm厚AM-20沥青碎石过渡层+2.5cm厚应力吸收层组合措施效果最佳,其加铺层底的最大主应力σ1、最大剪应力τmax和等效应力σe下降幅度分别达78.6%、82.9%和84.4%。
Based on the theory of elastic layered system, a three-dimensional finite element model of asphalt concrete overlays on old cement concrete pavement with reliability verification was established by ANSYS program. The changes of vehicle load, overlay thickness, material parameters, Influence of Typical Reflective Crack Prevention Measures on the Most Unfavorable Part Load Stress of Asphalt Concrete Overlay. The results show that increasing the thickness of asphalt overlay can effectively reduce the maximum principal stress σ1, the maximum shear stress τmax and the equivalent stress σe of the overburden layer. For the example of analysis, add the layer structure, In the case of gravel transitional layer, the effect of geotextile interlayer modulus on load stress relieving is not obvious. Among the typical measures to prevent reflective cracking proposed in the overlay structure, a 7cm thick AM-20 asphaltum The combined effect of the transitional layer and the 2.5cm thick stress absorbing layer is the best. The maximum principal stress σ1, the maximum shear stress τmax and the equivalent stress σe of the overlay layer decrease by 78.6%, 82.9% and 84.4% respectively.