论文总字数：17612字

摘 要

鉴于半刚性基层沥青路面具有整体性好、造价低、强度高及水稳定性好等优点，目前半刚性基层沥青路面已经成为中国高等级公路路面的主要形式。但是半刚性基层在使用期间很容易产生干缩裂缝和低温收缩裂缝，在温度荷载和交通荷载的重复作用下，半刚性基层中的这种收缩裂缝极易扩展到沥青面层上，从而造成反射裂缝。一旦反射裂缝形成就会造成面层局部破碎、层底脱空、唧浆等病害，从而大大缩短路面的使用寿命。目前，反射裂缝已经成为影响我国高等级路面使用寿命的主要病害之一。

近些年来，国内外学者对反射裂缝进行了广泛的研究，提出了很多防裂措施，但是这些防裂措施通常比较分散，缺乏对不同防裂措施的效果及使用条件进行对比研究，使人们在进行防裂措施选择的时候很困惑。因此，对常用的防裂措施进行系统地、综合地研究是非常必要的，对比分析不同防裂措施的效果，便于人们更好更快的选择适合的防裂措施。

本文主要研究的防裂措施有：设置土木织物夹层、玻璃纤维格栅夹层、SAMI应力吸收层和沥青碎石联结层。通过力学分析、室内试验两种方法进行了研究，通过力学计算分析了车辆荷载、降温作用下路面的受力情况。在室内进行了反射裂缝的足尺疲劳试验，比较了两种防治措施的效果。

主要结论：设置防裂措施之后，确实可以看到不同程度的防裂效果，设置土木织物和玻璃纤维格栅是起到加筋作用；SAMI应变吸收层通过吸收裂缝尖端的应变集中来防止裂缝扩展，防裂效果要比玻璃纤维格栅和土木织物夹层要好；沥青碎石层作为联结层，由于沥青碎石的孔隙率较大，其吸收应变能力很好，裂缝在其内部发展缓慢，而且沥青碎石层具有一定的厚度，裂缝从基层发展至顶面需要较长的时间，很好的延缓了反射裂缝的发展，是最佳的防裂材料。

关键词:半刚性基础；反射裂缝；有限元分析；疲劳足尺实验

ABSTRACT

In view of the semi-rigid base asphalt pavement has good integrity, low cost, high strength and water stability is good wait for an advantage, the semi-rigid base asphalt pavement has become the main form of high grade highway pavement at present in China.But during the life of the semi-rigid base is easy to produce dry crack and low temperature shrinkage crack, under the action of temperature load and repeated traffic loading, the shrinkage crack of semi-rigid base is extended to the asphalt road surface, thus cause reflective crack. Reflective crack once formed can cause local crushing, surface layer concrete pavement, pumping pulp diseases, such as to shorten the service life of pavement. At present, the reflection crack influence the high grade pavement service life of our country has become one of the main diseases.

In recent years, domestic and foreign scholars conducted extensive research on the reflection crack, puts forward many measures, but these measures are often scattered, the lack of different conditions of anti-cracking measures effect and use comparative study, make people puzzled when to choose anti-cracking measures. For anti-cracking measures in common use, therefore, systematic and comprehensive study is very necessary, comparison and analysis the effect of different anti-cracking measures, facilitate people better and faster choose anti-cracking measures.

This paper mainly studies the anti-cracking measures are as follows: set up civil fabric interlining, glass fiber grid inter-layer, SAMI stress absorbed layer and gravel layer connection with asphalt. Two 2 methods through mechanics analysis, laboratory test was studied. By way of analyzing the mechanical calculation under the action of vehicle load, cooling the stress of the pavement. Laboratory test of the full-scale fatigue test of the reflection crack, compares the effect of two kinds of prevention and control measures.

Main conclusion: set the anti-cracking measures after the stress value is reduced, set up civil fabric and glass fiber grid reinforced effect; SAMI strain absorption layer through the absorption of the crack tip strain concentration, to prevent the crack propagation and crack effect is better than glass fiber grille and civil fabric; Asphalt gravel layer as a link, due to the porosity of asphalt macadam is larger, the absorption of strain capacity is very good, the cracks in its internal development is slow, and asphalt gravel layer has a certain thickness, crack development to top surface need a long time, good slow the development of the reflective crack, is the best sandwich material to prevent reflection crack.

Keywords: semi-rigid base; Reflection crack; The finite element analysis; Fatigue full scale experiment

目 录

摘 要 I

ABSTRACT II

第一章 绪论 1

1.1课题研究的背景和意义 1

1.2国内外研究现状 1

1.3国内外对反射裂缝的研究方法及防裂措施 2

1.3.1力学分析法 2

1.3.2室内试验研究 2

1.3.3防裂措施 2

1.4本文的研究目的及主要研究内容 3

第二章 半刚性基层沥青路面反射裂缝力学分析 4

2.1 引言 4

2.2 车辆荷载作用下路面受力分析 4

2.2.1 车辆对路面的垂直荷载分析 4

2.2.2 车辆对路面的水平荷载分析 5

2.2.3 三维模型有限元分析 7

2.3 降温作用下路面受力分析 9

2.3.1温度应力计算公式 9

2.3.2 沥青混合料的粘弹性模型力学分析 10

2.4.1 断裂力学简介 12

2.4.2有限元法计算应力强度因子 12

第三章 室内试验研究 14

3.1引言 14

3.2 沥青路面反射裂缝足尺疲劳试验 14

3.2.1 足尺疲劳试验简介 14

3.2.2试验方案 15

3.2.3 试验结果 15

3.2.4 结果分析 15

第四章 结语 16

4.1 主要结果 16

4.2展望 16

致 谢 17

参考文献（References） 18

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