水泥混凝土路面

1、水泥混凝土路面 cement concrete pavement,,§13-1：概述 Introduction1、定義Definition2、優(yōu)點(diǎn) Strong points1）強(qiáng)度高good dependability ；2）穩(wěn)定性好good stability；3）耐久性好good durability；4）有利于夜間行車preferable for driving in the dark。3、缺點(diǎn)weak po

2、ints1)對(duì)水和水泥的需要量大a great demand for water and cement；2）有接縫having joints；3）開放交通遲takes a long time to be open to traffic；4）修復(fù)困難difficult to repair。 §13-2：水泥混凝土路面構(gòu)造structure of cement concrete pavement一、土基和基層ea

3、rth base and base course1、土基earth base要求：密實(shí)，均勻和穩(wěn)定 2、基層base course要求：足夠的強(qiáng)度和穩(wěn)定性，且斷面正確，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，中央分隔帶排水，路面表面滲水四、接縫的構(gòu)造與布置structur

4、e and arrangement of the joint 1、橫向接縫的構(gòu)造與布置structure and arrangement of transverse joints1）縮縫contraction joint2）脹縫expansion joint3）施工縫construction joint橫縫構(gòu)造形式圖2、縱縫的構(gòu)造與布置structure and arrangement of longitudinal joi

5、nts縱縫構(gòu)造形式圖3、縱橫縫的布置arrangement of longitudinal and transverse joints,五．特殊部位混凝土路面的處理treatment of special sections of concrete pavement六．接縫材料及技術(shù)要求joint material and technical requirements,第十四章 水泥混凝土路面設(shè)計(jì)design of cement c

6、oncrete pavement§14-1 概述introduction一、破壞類型 types of destruction1、斷裂breakdown2、唧泥mud spurt3、錯(cuò)臺(tái)slab staggering4、拱起haunchup5、接縫擠碎joint crush二、路面結(jié)構(gòu)設(shè)計(jì)design of pavement structure1、路面結(jié)構(gòu)層組合設(shè)計(jì)design of pavement str

7、ucture layers2、混凝土板厚度設(shè)計(jì)design of thickness of concrete flags3、混凝土板的平面尺寸與接縫設(shè)計(jì)flat dimensions of concrete flags and design of joints4、路肩設(shè)計(jì)design of road shoulder,§14-3 彈性地基板的應(yīng)力分析stress analysis of elastic subgrade

8、plate,在計(jì)算汽車荷載作用下：1.混凝土板工作處于彈性階段；2.基層和土基工作處于彈性工作階段；水泥混凝土路面結(jié)構(gòu)簡(jiǎn)化為彈性地基板。,一.彈性地基板基本假定basic assumption of elastic subgrade plate混凝土板在計(jì)算汽車荷載的作用下,所產(chǎn)生的變形遠(yuǎn)小于其厚度,可采用小撓度彈性薄板理論.1.垂直于中面方向的應(yīng)變變形極其微小,可忽略不計(jì),薄板全厚度范圍內(nèi)的所有點(diǎn)都有相同的位移;2.垂直于

9、中面的法線,在彎曲變形前后均保持為直線并垂直于中面,因而無橫向剪切變形;3.中面上各點(diǎn)無平行于中面的位移.,二.文克勒地基與彈性半空間地基elastic half-spaced subgrade地基模型subgrade mould,文克勒地基,彈性半空間地基elastic half-spaced subgrade,三.半無限地基板荷載應(yīng)力的有限元解finite element solution of load stress of h

10、alf-infinite subgrade plate1.有限元法finite element solution有限元法是結(jié)構(gòu)和連續(xù)介質(zhì)應(yīng)力分析中的一種有效的計(jì)算方法.2.臨界荷位的確定location of boundary load position: 縱縫邊緣中部,§14-4 水泥混凝土路面板厚設(shè)計(jì)方法thickness design methods of cement concrete flag一、設(shè)計(jì)參數(shù)

11、design parameter 1.標(biāo)準(zhǔn)軸載與軸載換算 standard axle load and conversion of axle load 標(biāo)準(zhǔn)軸載:車軸重為100KN的單軸荷載. 2. 交通分級(jí)、設(shè)計(jì)使用年限和累計(jì)作用次數(shù)traffic classification, designed life span and accumulative effect times 交通分級(jí):特重、重、中等、輕,3

12、.基層頂面的當(dāng)量回彈模量和計(jì)算模量 the equivalent resilience modulus of the upper surface of the base course and the calculation of the modulus 1)新建公路的基層頂面模量值the modulus of the upper surface of the newly built road,2)原有路面的頂面當(dāng)量回彈模型the eq

13、uivalent resilience mould of the upper surface of the original pavement,3)計(jì)算回彈模型resilience mould of calculation,3. 水泥混凝土的設(shè)計(jì)強(qiáng)度與彎拉彈性模量design dependability and elastic modulus of cement concrete,二、荷載疲勞應(yīng)力load fatigue stress

14、1.荷載應(yīng)力計(jì)算load stress calculation,2.接縫傳荷能力load passing capability of the joint 集料嵌鎖aggregate embedding and locking 、傳力桿dowel bar、傳力桿和集料嵌鎖dowel bar and aggregate embedding and locking3.荷載疲勞應(yīng)力load fatigue stress,三、溫度疲勞應(yīng)力

15、分析temperature fatigue stress analysis,五、水泥混凝土板的綜合疲勞作用synthetic fatigue effect of cement concrete plate路面結(jié)構(gòu)可靠度設(shè)計(jì)方法,六、設(shè)計(jì)過程design process1、收集并分析交通參數(shù)collection and analysis of traffic parameters2、初擬路面結(jié)構(gòu)define primary pave

16、ment structure3、確定材料參數(shù)define material parameters4、計(jì)算荷載疲勞應(yīng)力calculate loading fatigue stress5、計(jì)算溫度應(yīng)力calculate temperature stress6、檢驗(yàn)初擬路面結(jié)構(gòu)check the pavement primarily defined,§14-6 水泥混凝土路面的平面尺寸和接縫設(shè)計(jì)flat dimension

17、s of cement concrete pavement and design of joints一.板的平面尺寸flat dimensions of slabs1.縱縫間距 longitudinal joint spacing 按車道寬度確定 be decided based on lane width2.橫縫間距transverse joint spacing 4~6m3.板的平面形狀flat shape of