贵州省高等级公路沥青路面典型结构的研究

Research on typical  structure of high-grade highway asphalt pavement in guizhou province

研究生：侯训田

指导教师：郭忠印教授

二〇〇七年三月

摘要

本文针对贵州省部分公路沥青路面出现的比较严重的早期损坏现象，为提高贵州地区路面的使用品质，开展了高等级公路沥青路面典型结构的研究。主要研究内容及成果有：
     （1）对贵州地区几条高等级公路的路面结构、破损状况进行了调查，分析了车辙、裂缝这2种主要损坏现象出现的原因，并提出了一些解决方案以解决或减少贵州路面的早期损害。
     （2）对贵州地区几条公路的交通量及累计轴载次数进行了研究，提出了不等维递推灰色预测模型法来预测交通量及增长率，并对交通量等级进行了划分。

（3）对贵州地区的气候分区、土基分区进行了研究，在总结国内土基模量反算成果的基础上，提出了土基模量反算公式，给出贵州土基等级的划分，同时根据等效竣工验收弯沉方法计算出了石灰土处理深度。

（4）对路面结构的力学响应进行了研究，分析了几种不同路面结构的优缺点，作为推荐路面结构的理论依据。

（5）推荐了2种路面结构——沥青稳定碎石复合基层沥青路面结构、半刚性基层沥青路面结构作为贵州省高等级公路沥青路面典型结构，其中沥青稳定碎石复合基层沥青路面结构为首选。沥青稳定碎石复合基层沥青路面结构采用级配碎石作垫层，水泥稳定碎石作底基层，沥青稳定碎石作上基层，较好性能的沥青层作面层。并且这种结构充分考虑了贵州路面的损坏状况、贵州当地材料的性质、经济性和技术性方面的要求。

（6）根据相关试验成果提出了贵州路面材料设计参数，利用采用双圆垂直均布荷载作用下的弹性层状体系理论，以路表弯沉值为路面结构整体刚度的设计指标，计算了典型结构的厚度并加以图表化。
     最后，关于进一步工作的方向进行了简要的讨论。

关键词：典型结构，早期损坏，交通量，气候，土基，力学响应，沥青稳定碎石，半刚性基层弯沉

ABSTRACT

This program  mainly aims at the early damage in the asphalt pavement in Guizhou province；In order to improve the  asphalt pavement quality，Research has been done the on typical structure Of high-grade  highway asphalt pavement. Main contents are as following ：

(1) The  asphalt pavement structures and damages of several roads in Guizhou province  are investigated，and  the causation and solution are advanced In order to reduce the damages．

(2) The  traffic and equivalent single axle loads are studied. The traffic and average  traffic growth rate in the design period are calculated In the  unequal-dimensional recursion grey model advanced，and traffic grade sub-area is  advanced.

(3) The  climate and soil sub-area are also researched. a soil modulus  back-calculation formula is put forward based on the summing up the results  of soil modulus back-calculation formulas. Soil modulus sub-area is also  advanced. The thickness of lime soil is accounted with the equivalent  completed accepted deflection method.

(4) Asphalt  pavement mechanical responses are researched, and the results could be the  basis.

(5) Two kinds  of asphalt pavement, ATB multiplex base and semi-rigid type base are  advanced, and ATB multiplex base is preferred, which is composed of high  quality asphalt course、asphalt treated crushed stone base、semi-rigid sub-base and graded aggregate bedding  layer. The damage of asphalt pavement、the material property、economy and technology in Guizhou province are also thought over  in this structure. The semi-rigid base structure is standby considering which  has been in common use in Guizhou province.

(6)The  pavement materials design parameters are studied based on some experiments．The thicknesses of pavement  are calculated and charted

In the  finality, the problems requiring further studies are discussed.

Key Words：typical structure,  forepart damage, traffic, climate, soil, mechanical response, ATB, semi-rigid  type base, deflection