【作者】 黄爱明；

【导师】 延西利；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 随着公路交通运输的发展,一些旧水泥路面陆续出现断裂破坏,旧水泥路面养护维修的技术方法之一,就是在旧水泥路面上加铺沥青面层,形成一种复合式的“白加黑路面”。这样的路面结构已有一定的应用实践,但欠缺相关的力学分析。本文采用三维有限元模型对旧水泥路面加铺沥青面层技术的相关力学问题进行分析。本文力学分析是以白加黑路面的防裂和粘结两个关键技术为主线,白加黑路面最难解决问题之一是反射裂缝,为了从理论上研究如何防治反射裂缝,需要分析接缝区加铺层内的应力状态及接缝处旧水泥板的弯沉差。本文针对沥青加铺层在最不利荷载位置的应力状态进行详细计算分析;并对加铺后的结构在荷载作用下,旧水泥板在接缝处的弯沉差进行计算分析,这对研究如何防治反射裂缝有一定的帮助。白加黑路面的第二个问题是层间粘结问题,针对旧水泥路面和沥青加铺层之间的层间滑移现象,本文对层间的接触状况、层间最大剪应力位置及层间最大剪应力值进行分析,总结出能有效降低层间剪应力的措施。针对旧水泥路面板的连锁破坏现象,本文从新旧水泥板的荷载差异、应力差异和弯沉差异三个方面来分析新旧水泥板的变异特性,并采用变异系数和弯沉差来评价新旧水泥板间适应性等级。本文在路面使用状况评价及力学分析的基础上,以弯拉应力为控制指标,进行加铺层厚度计算;并引用国外的经验设计方法计算加铺层厚度。最终比较各种方法的计算结果,确定加铺层厚度值,并针对实体工程中白加黑路面的结构设计方案进行说明。更多还原

【Abstract】 With the development of road transportationsome of the old cement pavement emerge fracture damage, one of the maintenance technique of the old cement road is to overlay the asphalt surface on old cement pavement, form a composite of" white and black pavement". This kind of road has a certain structure of practice, but lack the mechanical analysis. Based on the three-dimensional finite element, this paper introduce the mechanical analysis of white and black pavement".The mechanical analysis of this paper implement the idea of crack and bond issues, Reflection Crack is one of the most difficult problems to solve in white and black pavement. In order to study how to control reflection cracks in theory, the stress state in the seam zone overlay and the deflection difference in the seams old cement pavement. This paper conduct a detailed analysis on the stress state of the asphalt overlay at the worst load position, also this paper analysis the deflection difference in the seams old cement pavement in the overlay structure, this study is helpful to the control of the reflective crack. The second problem of the white and black pavement is bond issues, according to the slip phenomenon between the old cement pavement and asphalt overlay layer, this paper analysis the contact states between layers, the location of the largest inter laminar shear stress and the maximum shear stress, summarized some measures which can reduce the inter laminar shear stresses effectively.In order to solve the chain damage of the old cement pavement, this paper analysis the old and new cement slab variability characteristics in three aspects: load differences, Stress differences and deflection differences, and using the coefficient of variation and deflection differences to evaluate the new and old cement cubicle adaptive hierarchy. Based on the pavement evaluation and mechanical analysis, this paper calculate the overlay thickness on the basis of using bending stress as a control indicators and quoting the foreign experience design method. Ultimately introduce the structure design of the white and black pavement in the real project.更多还原