【作者】 曾蔚；

【导师】 王选仓；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2008， 博士

【摘要】 桥面铺装粘结层破坏是导致桥面铺装病害的一个主要原因,铺装层与桥面板间的接触粘结状态比较复杂,层间既包括粘结层材料的粘结力,也存在混凝土集料与桥面板间的摩阻力,确定粘结层的刚度或模量也很困难。在行车荷载、温度应力作用下,铺装层内部产生较大的剪应力,引起不确定破坏面的剪切变形,或者由于铺装层与桥面板层间粘结力差,抗水平剪切能力较弱,在水平方向上产生相对位移以致剪切破坏。剪切破坏直接导致有害物质下渗,下渗速度的大小又受使用期间桥面铺装层裂缝大小所支配,而粘结层是阻止有害物质下渗到桥面板的最后一道防线,因而分析粘结层的力学控制指标以及材料性能应用研究对防止桥面铺装病害有着很重要的现实意义。本文通过对沥青混凝土桥面铺装形式、病害的调查,分析其病害与粘结层关系,提出用同步碎石作为沥青混凝土桥面铺装粘结层的优越性。利用有限元理论,借助ANSYS手段对同步碎石粘结层进行了系统的荷载应力分析;依据桥面铺装温度应力与普通路面温度应力的差异性,计算了同步碎石粘结层温度应力变化。利用断裂力学理论分析了同步碎石粘结层的抗裂性能,计算出了粘结层的疲劳寿命;通过室内剪切试验、拉拔试验、抗渗性等试验研究确定了同步碎石粘结层沥青、碎石的选材要求以及沥青的最佳撒布量范围,提供了施工工艺参考。综合其力学状态与直剪试验指标分析,推荐出层间工作状态;以及与其它防水粘结层进行施工技术、经济、社会效益等综合对比分析,得出同步碎石作为沥青混凝土桥面铺装粘结层具有优越的性价比与最为广阔的应用前景。本文的研究内容主要包括以下几个方面:1、应用有限元理论对桥面铺装结构进行力学分析,研究了不同桥型沥青混凝土桥面铺装层间应力变化范围。系统而深入的分析了同步碎石粘结层层间荷载、温度应力的变化规律。2、应用断裂力学理论对桥面铺装和粘结层的抗裂性能和疲劳性能进行计算。当各结构层在车轮荷载及温度作用下产生的应力小于其极限抗拉强度时,得出其在一次荷载作用下的开裂应力和反复荷载作用下开裂的疲劳寿命。3、模拟桥面板对同步碎石桥面铺装粘结层分别进行剪切试验、拉拔试验、抗疲劳试验、抗渗性试验、温度敏感性试验,由试验数据进行正交分析研究得出:同步碎石作为防水粘结材料具有良好的耐久性、抗渗性、抗高温敏感性以及很强的粘结性能。4、通过与其他粘结材料进行性能对比分析得出:同步碎石粘结层抗剪强度大,高温抗剪、低温抗裂性能最优,容易满足高温抗剪与低温抗裂的不利要求。5、通过直剪试验得出:同步碎石粘结层抗剪强度>卷材类>涂膜类;同步碎石粘结层抗剪强度最大可达2.36Mpa;得出常温时[τ] = 0.60～0.65 Mpa;高温时[τ] = 0.30～0.40 Mpa。6、综合粘结层层间荷载应力、温度应力以及疲劳寿命,提出同步碎石桥面铺装粘结层的层间应力工作状态:[τ]_R≥0.4 Mpa;并通过直剪试验验证其正确性,可为设计、施工与选材提供借鉴。7、利用净现值法对五种桥面防水粘结层技术方案进行经济比较、综合考虑社会效益等因素,得出同步碎石作为防水粘结层时其性价比最高,提出同步碎石粘结层应用前景最为广阔。更多还原

【Abstract】 Bonding layer damage is a major reason that causes bridge deck pavement to disease, contact status between layers has complex comparison, includes to bonding layer material glue power, also has the power of frictional resistance between concrete fair material and the board of bridge floor; it is also very difficult to determine the mould or rigidity of the bonding layer. Once the vehicle load and temperature stress act, greater shearing stress inside the deck produces, which would lead to shear deformation in the undetermined shearing surface, or should lead to shear failure because of the weak bonding ability and weak level anti-shearing ability. Shear failure directly causes harmful material to seep, the speed of seep is controlled by the size of crack in the deck; the bonding layer is the final defensive line to prevent the harmful material to seep, thus it is very important to analyse on the mechnics control index of bonding layer. This paper analyses reason of asphalt concrete bridge deck pavement disease through the inquiry of form and the reason produced, suggests it has much superiority with synchronous pavement bonding layer. Using ANSYS finite element for Synchronous pavement bonding layer, it has carried out system analysis of the load stress; According to the discrepancy of temperature stress of synchronous pavement bonding layer and temperature stress of the ordinary road surface, it has calculated synchronous pavement bonding layer thermal stress change law; According to the common role of thermal stress and load stress, it has made the asphalt concrete bridge deck pavement stress working behavior. Using interface mechanics and breaking mechanics theory ,it analyses the anti-permeability and crack resistance of the synchronous pavement bonding layer; Passing through shear test, pull to pull-out test and anti-permeability test,it studies the standard of choosing materials such as asphalt、crushed stone and the OACmin～OACmax of the synchronous pavement bonding layer;it affords the optimum construction procedure. Synthesizing mechanics state and test index analysis of the synchronous pavement bonding layer with other waterproof material layers, synchronous pavement bonding layer has well-performance with the lowest price and the most vast application prospect. The research on this paper consists of six aspects as follows:1、Using ANSYS finite element for Synchronous pavement bonding layer, it has carried out system analysis of the load stress. It has systemly analyzed the change law of load and t thermal stress on synchronous crushed stone between layers.2、Calculates the ability of the anti-fracture and fatigue with fracture mechanics theory on synchronous pavement bonding layer. It can get the fracture stress under single load and the fatigue life under shuttle force with fracture mechanics theory when the load and thermal stress less the ultimate tensile strength.3、Imitate the board of bridge floor, for the synchronous pavement bonding layer, carries out shear test respectively, pull to pull out experiment , fight exhausted experiment, impermeability experiment and temperature sensitivity experiment. From test data, carries out orthogonality analysis: Synchronous crushed stone bonding layer material as waterproof has good endurance and impermeability, good anti-crack property as well as sensitivity of high temperature ability.4、Comparison to other bonding layer material: synchronous crushed stone bonding layer has high shear strength whether high temperature or low temperature.5、It has got a conclusion through direct shear test: shear strength of synchronous pavement bonding layer > waterproofing roll-roofing > coating film; the biggest shear strength of synchronous pavement bonding layer can reach 2.36 Mpa; [τ]=0.60~0.65 Mpa(normal temperature); [τ]=0.30~0.40 Mpa (heavy temperature).6、Synthesize to load stress , thermal stress as well as fatigue life, suggest that stress between layers under bridge deck pavement working state: [τ]_R≥0.4 Mpa; prove its correctness through direct shear test, can offer some reference for design, construction and choosing material.7、Synthesizing mechanics state and test index analysis of the synchronous pavement bonding layer with other waterproof material layers , synchronous pavement bonding layer has well-performance with the lowest price and the most vast application prospect, along with mechanization process and synchronous pavement surface equipment popularize step by step.更多还原