二灰碎石沥青路面开裂机理与防裂措施分析-市政工程专业论文.docxVIP

二灰碎石沥青路面开裂机理与防裂措施研究 摘 要 近些年来我国公路事业发展突飞猛进，二灰碎石基层以其优越的路用性得到广泛应 用，随之而来也产生一些不可避免的问题。二灰碎石基层产生裂缝是沥青路面损坏的根源， 裂缝原因由干缩、温缩以及其他原因所造成。 本论文针对灰碎石基层沥青路面出现开裂现象，对二灰碎石基层进行了进一步深入的 研究，就津沫公路的纵向裂缝进行了具体分析。分析了二灰碎石基层的开裂机理及裂缝的 成因，以及适合于天津市实际情况的二灰碎石基层防裂处理方法。并进行了试验验证二灰 稳定碎石混合料的骨架密实结构既能满足强度要求，又具有一定的抗裂性能，在贝雷法的 基础上确定了骨架密实结构的级配范围。对骨架密实结构的配合比进行确定的同时，又将 其合成级配与规范中值级配的部分性能进行了试验对比。采用疲劳断裂力学的分析方法对 夹层结构的防裂效果进行定量的分析，对新型应力吸收材料组成进行设计。最后，提出了 可行的二灰稳定碎石沥青路面的防裂措施，对基层预切缝的技术参数进行了初步分析，编 写了摊铺式应力吸收层的施工工艺及施工注意事项。 关键词:公路，沥青路面，二灰稳定碎石，裂缝 CRACKING MECHANISM AND PREVENTION MEASURES OF ASPHALT PAVEMENTS WITH LIME-FLYASH STABILIZED AGGREGATES BASE ABSTRACT In recent years,the highway has being developed rapidly in China. The lime-flyash stabilized aggregates base is used widely for its superior characters,and it also produced some of inevitable problems attendantly.The cracks gaven birth to in the lime-flyash stabilized aggregates base are the root causes of the asphalt pavements break.The reasons of causing cracks are drying shrinkage,temperature shrinkage and so on. Aim at the cracking phenomena in the asphalt pavement with lime-flyash stabilized aggregates base this paper gets a in-depth study on the lime-flyash stabilized aggregates base,and carries out a detailed analysis on the portrait crack of JinLai highway.It analyses the cracks cause and cracking mechanism of the lime-flyash stabilized aggregates base and the anti-cracking measures which are suit for the actual situation in Tianjin. And it carries out test verification that dense skeleton structure of mixture with lime-flyash stabilized aggregates both can satisfy the strength request and certainly resist cracking,and determined the dense skeleton structure gradation scope based on Behr’s method. At the time of carrying on the mix proportion design of dense skeleton structure, it has also made the contrast to partial performance between the optimization and the standard gradation. This paper has made quantitative analysis for anti-cracking sandwich structures by