水泥混凝土路面.ppt

1、水泥混凝土路面 cement concrete pavement,13-1：概述 Introduction1、定义Definition2、优点 Strong points1）强度高good dependability ；2）稳定性好good stability；3）耐久性好good durability；4）有利于夜间行车preferable for driving in the dark。3、缺点weak points1)对水和水泥的需要量大a great demand for water and cement；2）有接缝having joints；3）开放交通迟takes a long t

2、ime to be open to traffic；4）修复困难difficult to repair。13-2：水泥混凝土路面构造structure of cement concrete pavement一、土基和基层earth base and base course1、土基earth base要求：密实，均匀和稳定2、基层base course要求：足够的强度和稳定性，且断面正确，表面平整,二、混凝土面板frontpanel of concrete要求：表面平整，耐磨，抗滑等厚板,三、排水要求requirements for drainage 路肩排水，中央分隔带排水，路面表面渗水四、接

3、缝的构造与布置structure and arrangement of the joint 1、横向接缝的构造与布置structure and arrangement of transverse joints1）缩缝contraction joint2）胀缝expansion joint3）施工缝construction joint横缝构造形式图2、纵缝的构造与布置structure and arrangement of longitudinal joints纵缝构造形式图3、纵横缝的布置arrangement of longitudinal and transverse joints,五特殊

4、部位混凝土路面的处理treatment of special sections of concrete pavement六接缝材料及技术要求joint material and technical requirements,第十四章 水泥混凝土路面设计design of cement concrete pavement14-1 概述introduction一、破坏类型 types of destruction1、断裂breakdown2、唧泥mud spurt3、错台slab staggering4、拱起haunchup5、接缝挤碎joint crush二、路面结构设计design of pa

5、vement structure1、路面结构层组合设计design of pavement structure layers2、混凝土板厚度设计design of thickness of concrete flags3、混凝土板的平面尺寸与接缝设计flat dimensions of concrete flags and design of joints4、路肩设计design of road shoulder,14-3 弹性地基板的应力分析stress analysis of elastic subgrade plate,在计算汽车荷载作用下：1.混凝土板工作处于弹性阶段；2.基层和土基工

6、作处于弹性工作阶段；水泥混凝土路面结构简化为弹性地基板。,一.弹性地基板基本假定basic assumption of elastic subgrade plate混凝土板在计算汽车荷载的作用下,所产生的变形远小于其厚度,可采用小挠度弹性薄板理论.1.垂直于中面方向的应变变形极其微小,可忽略不计,薄板全厚度范围内的所有点都有相同的位移;2.垂直于中面的法线,在弯曲变形前后均保持为直线并垂直于中面,因而无横向剪切变形;3.中面上各点无平行于中面的位移.,二.文克勒地基与弹性半空间地基elastic half-spaced subgrade地基模型subgrade mould,文克勒地基,弹性半空

7、间地基elastic half-spaced subgrade,三.半无限地基板荷载应力的有限元解finite element solution of load stress of half-infinite subgrade plate1.有限元法finite element solution有限元法是结构和连续介质应力分析中的一种有效的计算方法.2.临界荷位的确定location of boundary load position: 纵缝边缘中部,14-4 水泥混凝土路面板厚设计方法thickness design methods of cement concrete flag一、设计参数

8、design parameter 1.标准轴载与轴载换算 standard axle load and conversion of axle load 标准轴载:车轴重为100KN的单轴荷载. 2. 交通分级、设计使用年限和累计作用次数traffic classification, designed life span and accumulative effect times 交通分级:特重、重、中等、轻,3.基层顶面的当量回弹模量和计算模量 the equivalent resilience modulus of the upper surface of the base course a

9、nd the calculation of the modulus 1)新建公路的基层顶面模量值the modulus of the upper surface of the newly built road,2)原有路面的顶面当量回弹模型the equivalent resilience mould of the upper surface of the original pavement,3)计算回弹模型resilience mould of calculation,3. 水泥混凝土的设计强度与弯拉弹性模量design dependability and elastic modulus o

10、f cement concrete,二、荷载疲劳应力load fatigue stress1.荷载应力计算load stress calculation,2.接缝传荷能力load passing capability of the joint 集料嵌锁aggregate embedding and locking 、传力杆dowel bar、传力杆和集料嵌锁dowel bar and aggregate embedding and locking3.荷载疲劳应力load fatigue stress,三、温度疲劳应力分析temperature fatigue stress analysis,五

11、、水泥混凝土板的综合疲劳作用synthetic fatigue effect of cement concrete plate路面结构可靠度设计方法,六、设计过程design process1、收集并分析交通参数collection and analysis of traffic parameters2、初拟路面结构define primary pavement structure3、确定材料参数define material parameters4、计算荷载疲劳应力calculate loading fatigue stress5、计算温度应力calculate temperature st

12、ress6、检验初拟路面结构check the pavement primarily defined,14-6 水泥混凝土路面的平面尺寸和接缝设计flat dimensions of cement concrete pavement and design of joints一.板的平面尺寸flat dimensions of slabs1.纵缝间距 longitudinal joint spacing 按车道宽度确定 be decided based on lane width2.横缝间距transverse joint spacing 46m3.板的平面形状flat shape of slabs 接近正方形,改善受力状况二.接缝设计design of joints,